Home Services Cost Methodology & Evidence Limits

Declared Assumptions

• Includes skip sheathing or breathable underlayment for proper ventilation
• Fire-retardant treatment is included where required by code
• Structural assessment confirms the roof frame can support 800-1,500 lbs per square
• Copper flashing and snow guards are included in premium estimates
• Roof deck is clean, dry, and structurally sound
• Includes standard termination bars, adhesive, and seam tape

Editorial Formula Summary

Estimates cedar shake roof cost using roof area, shake grade (premium, number one, or number two), shake thickness, and specialized installation labor for the hand-nailing and staggered coursing technique required.

Declared Assumptions

• Repair area is accessible without specialized scaffolding
• Existing roof structure is sound unless noted otherwise
• Emergency tarping is not included (add $200-$500 if immediate leak mitigation is needed)
• Single damage area — multiple repair zones may qualify for a full replacement instead
• Roof structure can support the weight of tile (typically 600-1,100 lbs per square)
• Includes battens, underlayment, and hip/ridge tiles

Editorial Formula Summary

Estimates roof repair expenses by categorizing damage type (missing shingles, flashing failure, leak patching, valley repair, or decking rot), measuring affected area in square feet, applying material-specific repair rates (asphalt $4-$8/sqft, metal $8-$15/sqft, tile $10-$20/sqft), and adding accessibility surcharges for steep pitches or multi-story homes.

Declared Assumptions

• Subfloor is level and in acceptable condition (deviation under 3/16 inch per 10 feet)
• Includes standard baseboards or quarter-round reinstallation
• Material acclimation time (48–72 hours for hardwood) is the homeowner responsibility and not included in labor cost
• Moisture testing of concrete subfloors passes at under 3 lbs per 1,000 sqft per 24 hours (ASTM F1869)
• Existing flooring removal and disposal is included if needed
• Prefinished engineered hardwood with click-lock installation is the standard baseline

Editorial Formula Summary

Calculates flooring cost by multiplying room square footage by per-square-foot material and installation rates — laminate ($2–$5), luxury vinyl plank ($3–$7), engineered hardwood ($6–$12), solid hardwood ($8–$15), or tile ($7–$15). Adds subfloor preparation (leveling compound at $1–$2/sqft if needed), old flooring removal ($1–$3/sqft), furniture moving surcharge, and transition strip fabrication between rooms and thresholds.

Declared Assumptions

• PEX repiping with manifold distribution is the baseline
• Includes drywall patching at access points but not full room repainting
• Standard mechanical snake clearing is the baseline service
• Single drain clearing without camera inspection is the starting estimate
• Main water supply is accessible near the planned installation location
• A floor drain or laundry standpipe is available for brine discharge within 20 feet

Editorial Formula Summary

Estimates whole-house repiping cost based on home square footage, number of fixtures, pipe material (copper, PEX, or CPVC), access conditions through walls, floors, and ceilings, and the drywall and finish restoration required after pipe installation.

Declared Assumptions

• Electric mat systems are the baseline for retrofit projects; hydronic for new construction
• Includes dedicated thermostat and electrical circuit for each zone
• Existing ductwork is in serviceable condition and compatible with the new system
• Equipment sizing follows Manual J load calculation for the home
• Replacing an existing boiler with same fuel type and distribution system
• Includes expansion tank, circulator pump, and basic piping connections

Editorial Formula Summary

Calculates radiant floor heating cost using heated area, system type (hydronic or electric), flooring material compatibility, insulation requirements beneath the heating layer, and thermostat zone configuration.

Declared Assumptions

• Pressure-treated pine posts with cedar boards is the standard configuration
• Concrete post footings and one walk gate are included
• Panels are set in concrete post footings to manufacturer specifications
• Includes one walk gate and hardware per 150 linear feet
• Soil conditions allow standard 4-inch gravel base without extensive grading
• Standard broom finish with control joints is the baseline

Editorial Formula Summary

Estimates wood fence cost using linear footage, wood species, fence height and board style (privacy, semi-privacy, or picket), post material and spacing, and the labor for digging, setting, and assembling each section.

Declared Assumptions

• Standard tear-off of one existing layer is included
• Roof pitch is walkable (6/12 or less) unless specified otherwise
• No structural decking repair needed (adds $2-$5/sqft if required)
• Permits and dumpster rental are included in the estimate
• Roof deck is structurally adequate for the chosen system
• Includes standard parapet flashing and one drain installation

Editorial Formula Summary

Calculates total roof replacement cost by multiplying your roof area (in roofing squares, where 1 square = 100 sqft) by the per-square cost for your chosen material, then adjusting for roof pitch complexity multiplier (1.0x for 4/12 up to 1.5x for 12/12), tear-off of old layers (single layer included, double layer adds $1-$2/sqft), waste factor (10-15% for complex shapes), and regional labor rate variance.

Declared Assumptions

• Kitchen footprint remains the same without structural wall removal
• Includes standard plumbing and electrical updates but not full rewiring
• Bathroom layout remains the same without moving drain or supply lines
• Includes standard ventilation fan upgrade and GFCI outlet installation
• Basement is dry with no active water intrusion requiring mitigation first
• Minimum ceiling height of 7 feet meets IRC R305.1 habitable space requirements

Editorial Formula Summary

Estimates kitchen remodel cost by combining cabinet replacement or refacing, countertop material and linear footage, appliance package, flooring, backsplash, plumbing fixture upgrades, and electrical modifications for the project scope.

Declared Assumptions

• Standard straight staircase with 12–14 steps is the baseline
• Includes dedicated electrical outlet installation at the staircase location
• Wall studs and stringer are structurally adequate for rail mounting without reinforcement
• Stairway width meets ADA minimum of 36 inches with the lift folded — narrower stairs may require a slim-profile unit at 15–20% premium
• Attic has adequate venting capacity or includes cost to add soffit/gable vents
• Standard ceiling joist spacing allows fan installation without structural modification

Editorial Formula Summary

Estimates stair lift cost based on staircase configuration — straight ($2,500–$5,000 installed), curved ($8,000–$15,000 with custom rail), or multi-flight ($12,000–$20,000) — rail length in linear feet, weight capacity (standard 300 lbs vs. heavy-duty 400–500 lbs), seat features (swivel, folding, powered footrest), and electrical/mounting modifications including a dedicated 20-amp outlet and wall-anchor reinforcement at the rail mounting points.

Declared Assumptions

• Interior French drain system with sump pump is the baseline approach
• Dehumidifier installation is included for comprehensive moisture control
• Submersible pump with 1/3 HP and PVC discharge piping is the baseline
• Includes basin excavation in existing basement concrete floor
• Crawl space height of 2-4 feet with adequate access
• No structural damage to floor joists requiring repair prior to encapsulation

Editorial Formula Summary

Calculates basement waterproofing cost based on basement square footage, water intrusion severity, waterproofing method (interior drain and sump, exterior excavation and membrane, or crack injection), and the extent of drainage system installation required.

Declared Assumptions

• Chimney is accessible from the roof without specialized scaffolding
• Standard Portland cement mortar matching is the baseline for repointing
• Existing chimney foundation and below-roofline structure are structurally sound
• Standard clay flue liner or stainless steel liner replacement is included
• Scaffolding is required for chimneys extending more than 5 feet above the roofline
• Existing masonry fireplace opening 30–42 inches wide; custom surrounds for oversized openings add $600–$1,500

Editorial Formula Summary

Estimates chimney repair cost based on the type of repair needed (repointing, crown repair, flashing replacement, liner installation, or structural rebuilding), chimney height, accessibility, and material matching requirements.

Declared Assumptions

• Standard residential front and back yard scope is the baseline
• Includes basic grading, topsoil amendment, and mulch for planted areas
• Tree is accessible for standard bucket truck or climbing equipment
• Debris chipping and removal from the property is included
• Area is relatively flat with less than 10% grade
• Existing natural grass or soil requires 3-4 inches of excavation

Editorial Formula Summary

Estimates landscaping installation cost by combining softscape elements (plants, trees, sod, mulch), hardscape features (walkways, patios, walls), irrigation system, and design complexity with grading and soil amendment requirements.

Declared Assumptions

• 200-amp panel upgrade from existing 100-amp service is the baseline scenario
• Includes updated grounding and bonding to current code requirements
• Home has accessible attic and/or basement for primary wire runs
• Existing panel location is reused unless upgrade requires relocation
• All knob-and-tube or aluminum branch wiring is replaced with copper NM-B (Romex)
• AFCI protection is added to all bedroom circuits and GFCI to all wet-location outlets per current NEC requirements

Editorial Formula Summary

Calculates electrical panel upgrade cost by evaluating current service amperage, required new capacity, main breaker and bus bar specifications, subpanel needs, and any service entrance cable or meter base replacements the utility requires.

Declared Assumptions

• Foundation and soil conditions allow standard footings without piering
• Existing HVAC system has capacity for additional square footage or mini-split is added
• Building permit and site plan approval are included in the estimate
• Attachment point to existing house is structurally adequate (ledger board connection)
• Local fire code permits open burning or gas fire features at the proposed location
• Fire pit meets minimum setback requirements (typically 10-25 feet from structures)

Editorial Formula Summary

Estimates sunroom addition cost by selecting the sunroom type (three-season screened, four-season insulated, or solarium), room dimensions (width x depth), foundation type (concrete slab, pier footings, or deck conversion), roof style (studio/shed, gable, or cathedral), glazing specification (single-pane, double-pane low-E, or triple-pane), HVAC extension or supplemental heating, electrical circuits for outlets and ceiling fans, and interior finishing (flooring, trim, ceiling treatment).

Declared Assumptions

• Pressure-treated lumber substructure with composite decking and railing is standard
• Hidden fastener clip system is included in the baseline
• Underlying deck framing is structurally sound unless specified as damaged
• Standard board replacement rather than full deck rebuilding
• Deck is built at ground level or with ledger-board attachment at standard height
• Soil conditions allow standard concrete pier footings

Editorial Formula Summary

Calculates composite deck cost using deck area, composite brand and product line tier, hidden fastener systems, substructure framing material, and railing configuration with matching composite components.

Declared Assumptions

• Bathroom is on the top floor or has direct attic access for duct routing
• Duct run to the exterior vent is 15 feet or less
• Existing electrical power is available within the bathroom from a GFCI-protected circuit
• Existing water supply lines and drain are in usable condition and correctly positioned
• Vanity width fits the available wall space without relocating plumbing
• Flooring and wall surfaces behind the old vanity are in acceptable condition

Editorial Formula Summary

Determines bathroom exhaust fan installation cost by combining the fan unit price ($20-$350 depending on CFM rating, noise level, and features like humidity sensors or LED lights) with installation labor ($150-$400 for replacement or $250-$700 for new construction with ductwork). Adds ductwork materials at $3-$8 per linear foot and roof or wall cap venting at $30-$100.

Declared Assumptions

• Galvanized steel with 11.5 gauge mesh is the residential standard
• Terminal and line posts set in concrete are included
• Driveway width accommodates the selected gate type (swing needs clearance, sliding needs run space)
• Electrical power is available within 100 feet or solar option is selected
• Ground is relatively level at the gate location
• UL 325 safety devices (photo eyes, reversing mechanisms) are included per code

Editorial Formula Summary

Estimates chain-link fence cost using linear footage, fence height, wire gauge thickness, framework pipe diameter, and whether privacy slats, barbed wire top, or vinyl coating are added to the mesh.

Declared Assumptions

• Includes removal of existing siding and installation of moisture barrier
• Standard baked-enamel factory finish is the baseline
• Repair area reflects one documented scope
• Concealed barrier, lath, sheathing, and framing work is entered only when specified
• Equipment and disposal remain direct allowances
• Texture and color outcomes are not inferred or guaranteed

Editorial Formula Summary

Calculates aluminum siding cost based on wall area, panel gauge thickness, finish type (painted or anodized), and the labor for fitting around windows, corners, and architectural trim details.

Declared Assumptions

• Basic equipment package with pump, sand filter, and chlorine system is included
• Standard concrete or paver decking around the pool perimeter is included
• Pool size is a standard residential in-ground pool of 10,000-20,000 gallons
• Existing utility connections are within 25 feet of the equipment pad
• Installation includes a new heater unit with basic plumbing tie-in
• Every quantity, amount, hour, and rate comes from the visible entered scenario

Editorial Formula Summary

Estimates swimming pool installation cost by combining pool type (inground concrete, fiberglass, or vinyl liner), dimensions, depth configuration, equipment package (pump, filter, heater), decking, and safety fencing requirements.

Declared Assumptions

• Roof-mounted grid-tied system with net metering is the baseline
• No new federal residential solar credit is assumed for 2026 installations
• Home has a 200-amp electrical panel with space for a battery sub-panel or transfer switch
• Battery is installed indoors in a garage or utility room with ambient temperature 32-104 degrees
• No new federal residential battery credit is assumed for 2026 installations
• Standard 1,500–3,000 sq ft single-family home

Editorial Formula Summary

Estimates solar panel system cost using system size in kilowatts, panel type (monocrystalline or polycrystalline), inverter type (string, micro, or power optimizer), mounting system, and the electrical interconnection work required for grid-tied installation.

Declared Assumptions

• Mold source (leak, condensation, flood) has been identified and repaired
• Remediation area is accessible without major structural demolition
• Standard PPE and containment barriers are included
• Post-remediation air clearance testing is included in the estimate
• Water source has been stopped or contained before restoration begins
• Structural integrity of flooring and walls allows safe restoration work

Editorial Formula Summary

Estimates mold remediation cost by assessing the affected area in square feet, mold type (surface vs. systemic), location (visible wall, behind drywall, crawl space, attic, HVAC ductwork), containment requirements (negative air pressure barriers), removal method (HEPA vacuuming, antimicrobial treatment, demolition of porous materials), and post-remediation clearance testing by a third-party industrial hygienist.

Declared Assumptions

• Home has accessible wall cavities or conduit paths for wired installation
• Wi-Fi network provides adequate coverage for IP-based systems
• Standard installation includes a main door station and 3-4 interior monitors or speakers
• Existing doorbell wiring provides 16–24V AC power; transformer upgrade included if voltage sag detected
• Wi-Fi router within 30 feet and 2.4 GHz band enabled
• Subscription fees (Ring Protect, Nest Aware) excluded; account setup and mobile app pairing included

Editorial Formula Summary

Computes installation cost by combining hardware — wired intercom systems ($300-$2,000 for 4-8 stations) or wireless/IP-based systems ($200-$1,500) — with installation labor at $60-$120 per hour. Wired systems require 4-12 hours of low-voltage wiring, while wireless setups need 2-4 hours. Video doorbell integration, gate control, and smartphone connectivity add $100-$500 per feature.

Declared Assumptions

• Fireplace is located within 50 feet of the home on a flat or gently sloped site
• Local building code permits open-combustion outdoor fireplaces
• Foundation assumes stable soil conditions not requiring deep piers
• Tuckpointing assumes joints raked to 3/4-inch depth, repointed with color-matched mortar, and tooled to concave profile
• Mortar mix tested or visually matched to existing hardness; pre-1930 buildings often require lime mortars
• Scaffolding or boom lift included for work above 12 feet; ground-level repairs avoid mobilization upcharges

Editorial Formula Summary

Calculates construction cost by fireplace type — prefabricated kits ($1,500-$5,000) or custom masonry ($5,000-$20,000) — plus foundation and footing work ($1,000-$3,000), gas line installation if applicable ($500-$2,000), and chimney or flue construction ($1,500-$4,000). Mason labor estimated at $50-$90 per hour with typical builds requiring 40-120 hours.

Declared Assumptions

• Existing bathroom has adequate space for the walk-in tub footprint (typically 28-32 inches wide, 48-60 inches long)
• Existing water heater can deliver 50+ gallons of hot water or upgrade cost is included
• Electrical circuit is available for whirlpool/jet motor if applicable
• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components
• Direct equipment, disposal, testing, fabrication, design, permit, and authority allowances remain unchanged

Editorial Formula Summary

Calculates walk-in tub cost by combining the unit price ($3,000-$12,000 depending on features such as soaker, whirlpool jets, air jets, heated seat, or bariatric width) with installation labor ($1,500-$5,000 for plumbing, electrical, and finish work). Adds water heater assessment ($0-$1,500 for upgrade if needed for 50-80 gallon fill capacity), grab bar installation ($100-$300), and old tub removal ($500-$1,000).

Declared Assumptions

• Subfloor is level within 3/16 inch per 10 feet and structurally sound
• Old flooring removal is a separate line item at $1-$3 per square foot labor
• Furniture moving is homeowner responsibility unless a surcharge is added ($50-$150 per room)
• Baseboard removal and reinstallation is included in per-square-foot labor for hardwood and tile
• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components

Editorial Formula Summary

Isolates the labor portion of flooring installation by calculating per-square-foot crew time based on flooring type (laminate click-lock $1-$2, LVP $1.50-$3, engineered hardwood $3-$5, solid hardwood nail-down $4-$7, ceramic/porcelain tile $5-$10), subfloor preparation requirements (leveling, moisture testing), layout pattern complexity (straight vs. diagonal vs. herringbone), and transition strip installation between rooms and flooring types.

Declared Assumptions

• 4-inch thick concrete with wire mesh reinforcement on 4-inch gravel base
• Standard broom finish with control joints every 8-10 feet
• Standard 4-inch slab thickness on 4-inch compacted gravel base
• Welded wire reinforcement mesh is included in the base estimate
• Soil is stable and does not require additional compaction or fill

Editorial Formula Summary

Estimates concrete patio cost based on patio square footage, concrete thickness, finish type (broom, stamped, stained, or exposed aggregate), reinforcement, and the site preparation including grading and gravel base compaction.

Declared Assumptions

• Octagonal or rectangular kit gazebo on concrete pad is the standard baseline
• Includes shingle roof, railings, and entry steps
• Concrete slab pad is poured at 4" thick with wire mesh reinforcement — gravel base is the homeowner responsibility if needed
• No HOA architectural review fee is included — add $100–$500 where applicable
• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components

Editorial Formula Summary

Calculates gazebo installation cost from footprint size (typically 10x10 to 14x14 feet) and shape (octagonal, rectangular, or oval), material selection — pressure-treated wood ($3,000–$7,000), cedar ($5,000–$10,000), vinyl ($4,000–$8,000), or metal/aluminum ($2,000–$5,000) — roof type (asphalt shingle, standing-seam metal, or cedar shake), screening or glass enclosure options ($1,500–$5,000 add-on), and foundation preparation (concrete pad, paver base, or helical pier footings).

Declared Assumptions

• Includes catch basins at low points and solid pipe run to discharge location
• Basic lawn restoration over trenched areas is included
• Length, depth, and width describe one documented trench scope
• Pipe and gravel or fabric amounts use the same measured length
• Discharge equipment and disposal are entered as direct allowances
• Drainage design and lawful discharge are determined outside the calculator

Editorial Formula Summary

Calculates yard drainage system cost by evaluating the drainage problem type (standing water, slope runoff, or high water table), system components (catch basins, channel drains, dry wells, or grading), total pipe run length, and landscape restoration after installation.

Declared Assumptions

• Existing electrical outlet is available within reach of the opener unit
• Ceiling structure can support the opener weight without reinforcement
• Standard single or double-wide garage door (up to 18 feet wide)
• Includes safety sensor pair and wall-mount control panel
• Concrete slab is at least 28 days old and has not been previously sealed or coated (or old coating is fully removed)
• Slab moisture vapor emission rate is below 3 lbs per 1,000 sqft per 24 hours

Editorial Formula Summary

Estimates garage door opener installation cost based on drive type (chain, belt, screw, or direct-drive), motor horsepower (1/2 HP for single doors, 3/4 HP for double or insulated doors), smart-home integration features (Wi-Fi, smartphone control, battery backup), rail assembly and mounting, safety sensor installation per UL 325 requirements, and removal of existing opener if applicable.

Declared Assumptions

• Walls are in standard condition requiring normal prep (spackle nail holes, light sanding)
• Furniture moving and floor protection are included
• Standard ceiling height is 8-9 feet
• Two coats of paint over existing same-sheen surface is the baseline
• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components

Editorial Formula Summary

Estimates interior painting cost by calculating paintable wall and ceiling area (room perimeter × wall height, minus window and door openings, plus ceiling if included), selecting paint quality tier (contractor grade, mid-range, or premium), number of coats (one-coat coverage for same-color touch-ups, two coats standard, three coats for dramatic color changes), surface preparation level (basic cleaning and light sanding, moderate patching and priming, or extensive repair of water damage, wallpaper removal, or lead paint encapsulation), trim and detail work (baseboards, crown molding, window casings, doors), and ceiling painting.

Declared Assumptions

• Existing asphalt driveway is in fair to good condition without major structural failure
• Minor crack filling (under 50 linear feet) is included in the base estimate
• Weather conditions allow 24-48 hours of dry cure time after application
• Area and surface material amount use the same repair boundary
• Base, crack or joint, and drainage work is entered only when included in the scope
• Removal or disposal remains a direct allowance

Editorial Formula Summary

Estimates driveway sealcoating cost based on driveway area, sealant type (coal tar emulsion at $0.15-$0.25/sqft, asphalt emulsion at $0.10-$0.20/sqft, acrylic polymer at $0.20-$0.35/sqft), number of coats, crack filling requirements ($1-$4 per linear foot), oil stain treatment ($50-$150 per stain), and power cleaning or edging preparation work.

Declared Assumptions

• Existing sink has a standard 3.5-inch drain opening compatible with most disposals
• Electrical outlet or hardwired connection is already present under the sink
• Disposal horsepower defaults to 1/2 HP for light use or 3/4 HP for standard households
• Standard ceramic/porcelain tile costs $2-$8 per sq ft for materials plus $5-$10 per sq ft for labor
• Glass mosaic and natural stone tile costs $10-$30 per sq ft for materials plus $8-$15 per sq ft for labor
• Average kitchen backsplash covers 25-40 square feet between countertop and upper cabinets

Editorial Formula Summary

Estimates total cost by combining the disposal unit price ($80-$400 depending on horsepower and feed type) with installation labor ($100-$250 for a straightforward swap or $200-$450 when new electrical or plumbing connections are required). Additional costs for mounting hardware, dishwasher drain connectors, or upgraded wiring are itemized separately.

Declared Assumptions

• Two-stop installation is the baseline — each additional stop adds $5,000-$15,000
• Home structure can support the required load without major foundation work
• Standard cab size of 36 by 48 inches with 750-pound capacity
• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components
• Direct equipment, disposal, testing, fabrication, design, permit, and authority allowances remain unchanged

Editorial Formula Summary

Estimates total cost based on elevator type — hydraulic ($30,000-$60,000), pneumatic vacuum ($35,000-$65,000), or cable-driven ($25,000-$50,000) — plus shaft construction ($10,000-$25,000 for new construction or $15,000-$40,000 for retrofit), number of stops, and finish level. Permit fees, annual inspections, and maintenance budget of $300-$600 per year are itemized.

Declared Assumptions

• Standard two-car garage (20×20 feet) with drywall or painted CMU block walls
• Wall systems installed 18 inches above floor to clear baseboards; stud-finder confirmation of framing
• Overhead racks mounted to ceiling joists rated for 100 lb per joist
• Standard 6-foot reach-in or 6×6-foot walk-in closet
• Wall-mounted systems anchored to studs; drywall-anchor-only installations excluded from warranty
• Laminate systems assume 5/8-inch thermally fused melamine; solid wood uses 3/4-inch birch or maple plywood

Editorial Formula Summary

Total investment calculated from linear wall footage, system type (slatwall panels, track-mounted rails, or pegboard), component mix (hooks, baskets, shelves), overhead rack dimensions and weight capacity (200–600 lb ratings), and cabinet quantity and material.

Declared Assumptions

• Every fee starts at zero and changes only when the user enters an amount from the named dated authority schedule
• Inspection count is reported only and never creates or multiplies a fee
• No ZIP, project-value, access, location, work-type, or national fee assumption is applied
• The critically contained page is noindex and lead-disabled, but its direct entered-fee arithmetic remains available and is not fully disabled

Editorial Formula Summary

Adds only the entered application, plan-review, inspection, reinspection, and other authority fees from the named dated schedule, and reports entered inspection count without applying ZIP, project-value, access, location, or national-fee assumptions.

Declared Assumptions

• Old siding removal and disposal is included
• Standard J-channel, corner posts, and starter strips are included

Editorial Formula Summary

Estimates vinyl siding cost based on exterior wall square footage, siding thickness and profile style, insulated vs. non-insulated backing, and the amount of trim, soffit, and corner piece work required.

Declared Assumptions

• Repair materials match existing fence type and dimensions
• Damaged posts require concrete footing replacement

Editorial Formula Summary

Calculates fence repair cost based on the number of damaged sections, repair type (post replacement, board replacement, or hardware tightening), material matching needs, and whether the repair is localized or spans multiple sections.

Declared Assumptions

• Existing door frame is reusable and does not require widening or structural changes
• Standard lockset and hinges are included; smart locks and premium hardware are add-ons

Editorial Formula Summary

Calculates door replacement cost per unit based on door type (entry, interior, patio, or storm), material (fiberglass, steel, wood, or composite), hardware, and frame modifications needed for the new door.

Declared Assumptions

• Every monetary rate and allowance is supplied by the user
• The model does not select a system type, size a drain field, interpret a percolation test, or determine approval
• Soil, groundwater, setbacks, design flow, reserve area, local rules, and site access require professional and regulatory review

Editorial Formula Summary

Adds the entered tank cost, drain-field materials, site-preparation equipment, percolation testing, engineering, labor hours multiplied by the entered hourly rate, and permit or notification allowance. Installation access affects labor only; location factors are scoped to matching components.

Declared Assumptions

• Gas line is available within 25 feet of the fireplace location
• Wall framing can accommodate the fireplace unit without structural modification
• Direct-vent installation through an exterior wall (shortest venting path)
• Combustible clearances met per manufacturer specs and local fire code

Editorial Formula Summary

Estimates fireplace installation cost by selecting the fireplace type (gas direct-vent, gas ventless, electric, or wood-burning), then adding venting requirements (direct-vent wall penetration vs. chimney construction), gas line installation or extension if needed, hearth and surround materials (stone, tile, or manufactured), mantel installation, and electrical hookup for fans, ignition, or remote controls.

Declared Assumptions

• Asbestos-containing material has been confirmed by a certified inspector and lab analysis
• Abatement is performed by a licensed and insured contractor per state and EPA regulations
• Regulated waste disposal at an approved landfill is included in the estimate
• Air monitoring during and after abatement is performed by a third-party industrial hygienist

Editorial Formula Summary

Estimates asbestos abatement cost by identifying the asbestos-containing material type (popcorn ceiling, floor tile, pipe insulation, siding, roofing, or vermiculite attic insulation), measuring the affected area in square feet or linear feet, selecting the abatement method (full removal, encapsulation, or enclosure), adding required containment setup (negative air units, polyethylene sheeting, HEPA filtration), worker protection (licensed abatement crew with PPE), regulated waste disposal fees, and post-abatement air clearance testing by an accredited lab.

Declared Assumptions

• Existing hot water supply valve and drain connection are within 6 feet of the dishwasher location
• Cabinet opening matches standard 24-inch width dishwasher dimension
• Electrical circuit exists (hardwired or outlet) near the installation point
• Old dishwasher removal and basic haul-away is included

Editorial Formula Summary

Estimates dishwasher installation cost by selecting the dishwasher type (standard built-in, compact 18-inch, drawer-style, or portable/countertop), accounting for cabinet opening preparation (widening, trimming, or shimming for fit), water supply connection (hot water valve and braided supply line), drain connection (high-loop to disposal or air gap fitting), electrical connection (hardwired junction box or standard plug-in outlet on a dedicated 15-amp or 20-amp circuit), and removal and disposal of the old unit.

Declared Assumptions

• This page models decorative baseboard trim only
• Every price or allowance is supplied by the user
• Electrical baseboard heaters, circuits, thermostats, and HVAC work are excluded

Editorial Formula Summary

Adds the visible trim-material amount, corner and hardware allowance, removal and disposal, wall repair, finishing, and labor hours multiplied by the entered hourly rate. Access affects labor only; location factors are limited to matching material and labor components.

Declared Assumptions

• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components
• Direct equipment, disposal, testing, fabrication, design, permit, and authority allowances remain unchanged
• Zero means the component is not included; it is not replaced by a hidden national price

Editorial Formula Summary

Adds entered blind or shade equipment, mounting hardware after its matching material adjustment, motorization or electrical equipment, measurement or design, removal or disposal, and access-adjusted entered labor; divides by entered opening count only when positive.

Declared Assumptions

• Installation site is level or requires minimal grading (under 6 inches)
• Soil conditions allow standard post footings without engineered foundations
• Local zoning permits carport structures with required setbacks from property lines

Editorial Formula Summary

Estimates carport installation cost based on structure type and size: single-car (12x20 ft) aluminum or steel kits ($1,500-$4,000), double-car (20x20 ft) metal structures ($3,000-$8,000), or custom wood carports ($5,000-$15,000). Adds concrete slab or footing costs ($4-$8 per sq ft), permits ($100-$500), and labor for assembly and anchoring ($500-$2,500).

Declared Assumptions

• Structural integrity has been verified by a licensed engineer or fire marshal
• Emergency board-up and water extraction are included as initial costs
• All work meets current building codes, not original construction codes

Editorial Formula Summary

Estimates fire and smoke damage restoration cost based on affected area, damage severity level (minor smoke only at $3-$8/sqft, moderate fire and smoke at $10-$25/sqft, major structural fire damage at $25-$75/sqft), restoration scope (smoke cleaning, demolition, structural rebuild, content restoration), specialized services (ozone treatment, thermal fogging, HVAC decontamination), and emergency board-up and water extraction.

Declared Assumptions

• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components
• Direct equipment, disposal, testing, fabrication, design, permit, and authority allowances remain unchanged
• Zero means the component is not included; it is not replaced by a hidden national price

Editorial Formula Summary

Adds entered spring, cable, hardware, panel, track, opener, diagnostic, emergency-service, removal, and disposal allowances, then adds entered labor hours multiplied by the entered rate and labor-only access and location adjustments; divides by entered door count only when positive.

Declared Assumptions

• Drilling rig has site access to the proposed well location
• Well must produce a minimum of 3-5 gallons per minute for household use
• Minimum setbacks from septic systems (50-100 feet) and property lines (10-25 feet) are met

Editorial Formula Summary

Estimates total well system cost based on drilling depth ($15-$60 per foot depending on geology), casing material and diameter ($10-$20/ft for PVC or steel), well screen and gravel pack ($200-$500), submersible pump ($500-$2,000), pressure tank ($300-$1,000), pitless adapter ($200-$400), wiring and controls ($500-$1,500), and water quality testing ($100-$500). Total system cost ranges from $5,000 to $20,000.

Declared Assumptions

• Every monetary amount is supplied by the user
• A qualified operator selects the method, pressure, chemistry, protection, and wastewater controls for the actual surface
• Lead-safe work rules, discharge restrictions, permits, repairs, sealing, and hazardous-material handling are outside the formula unless entered as allowances

Editorial Formula Summary

Adds user-entered cleaning materials, equipment rental, runoff containment or recovery, waste handling, and labor hours multiplied by the entered hourly rate. Access affects labor only; the model has no roof-pitch input and no hidden surface-price table.

Declared Assumptions

• Basic wireless DIY systems (Ring, SimpliSafe) cost $200-$500 for equipment plus $10-$25/month monitoring
• Professional installations (ADT, Vivint) typically cost $0-$500 equipment with 24-60 month monitoring contracts at $30-$65/month
• Wired systems cost 2-3x more for installation but offer higher reliability and no battery maintenance

Editorial Formula Summary

Estimates home security system installation costs using system type (wired, wireless, hybrid), number of entry points, sensor package (door/window, motion, glass break), monitoring plan (professional vs. self-monitored), smart home integration requirements, and camera count.

Declared Assumptions

• Attic blown-in insulation costs $1.00-$2.50 per square foot for standard depths achieving R-38 to R-60
• Cellulose is 20-30% cheaper than fiberglass but settles 15-20% over time, requiring slightly higher initial depth
• Air sealing before insulation adds $500-$1,500 but improves insulation effectiveness by 25-40%

Editorial Formula Summary

Estimates blown-in insulation costs using insulation type (fiberglass, cellulose, mineral wool), coverage area (square footage), target R-value, existing insulation condition, access difficulty, and whether air sealing is included. Calculates material and labor separately.

Declared Assumptions

• Every material amount uses the same documented window count and trim scope
• Labor hours and labor rate use the same billable-work definition
• Access changes labor only
• Existing concealed conditions and opening repairs are excluded unless entered

Editorial Formula Summary

Adds the entered per-window trim material amount, stool and apron materials, preparation or repair materials, finish materials, removal or disposal, and access-adjusted installation labor for the entered window count.

Declared Assumptions

• Station count and station unit amount describe the same selected equipment
• Controller, cabling, and gate-access scope is entered separately
• Existing network and power conditions are not assumed suitable
• Configuration, licensing, subscriptions, and ongoing service are excluded unless entered

Editorial Formula Summary

Multiplies entered station count by the station equipment amount and adds controller or network equipment, cabling, gate-access equipment, removal or disposal, labor, permit or inspection, and labor-only access components.

Declared Assumptions

• The selected hood and cooking appliance are documented outside the calculator
• Exhaust and recirculating configurations are treated as different project scopes
• Duct route, termination, power, and makeup air are entered only when included
• The calculator does not size airflow or determine whether makeup air is required

Editorial Formula Summary

Adds entered hood equipment, mounting support, duct materials, electrical materials, makeup-air equipment, removal or disposal, labor, permit, and labor-only installation-access components.

Declared Assumptions

• Dimensions describe one documented trench geometry
• Rock, groundwater, soil classification, shoring, shielding, sloping, access, and haul-off are represented only by entered scope items
• Utility marks do not replace private utility investigation where needed
• A qualified project team determines excavation safety and protective systems

Editorial Formula Summary

Converts entered trench length, depth, and width to excavation volume, applies the entered cost per cubic yard, and adds bedding or backfill, utility protection, protective systems, equipment, haul-off, labor, permit, and labor-only access components.

Declared Assumptions

• Area and finish amount use the same documented conversion boundary
• Each building-system allowance represents a defined scope without overlap
• Existing structure and utilities are not assumed adequate
• Approval, occupancy, rental eligibility, and schedule are determined outside the calculator

Editorial Formula Summary

Multiplies entered conversion area by the entered envelope and finish material amount, then adds structural, mechanical, plumbing, electrical, kitchen, bathroom, parking, labor, design or engineering, permit or impact-fee, and labor-only access components.

Declared Assumptions

• Area and shell amount use the same building boundary
• Foundation, doors, electrical, finishes, and site work are entered without overlap
• Soil, drainage, utilities, structure, and property constraints are not inferred
• Design, approval, and schedule remain outside the calculator

Editorial Formula Summary

Multiplies entered garage area by the entered shell material amount, then adds foundation, doors or hardware, electrical, insulation or finishes, site-preparation equipment, labor, design or engineering, permit, and labor-only access components.

Declared Assumptions

• APR and term are entered from the same financing scenario
• A down payment at or above project cost produces zero financed principal
• Unentered origination charges, points, closing costs, insurance, taxes, liens, and other terms are excluded
• The calculation does not model approval, credit qualification, variable rates, late fees, or prepayment terms

Editorial Formula Summary

Subtracts the entered down payment from the entered roof project cost, clamps financed principal at zero, and applies the user-entered APR and number of monthly payments to show principal, monthly payment, total scheduled payments, and total interest.

Declared Assumptions

• Pier or anchor quantity comes from a documented professional scope
• Affected area is used only to contextualize the planning total
• Engineering, cleanup, and authority fees are entered directly
• The calculator does not infer cause, condition, repair method, or structural adequacy

Editorial Formula Summary

Multiplies entered pier or anchor count by the entered material amount per unit and adds crack-repair materials, drainage-correction materials, engineering or inspection, restoration or cleanup, labor, permit, and labor-only access components.

Declared Assumptions

• Room count comes from the documented professional scope
• Treatment method and safety controls are selected outside the calculator
• Follow-up visits use one consistent visit definition
• No pesticide, heat, preparation, reentry, disposal, or eradication instruction is inferred

Editorial Formula Summary

Adds entered professional inspection, treatment material or equipment, preparation service, follow-up visit count times the entered amount per visit, laundering or disposal, and labor-only access-adjusted professional service components.

Declared Assumptions

• Linear feet and panel amount use the same shelf-depth and material basis
• Hardware, rods, drawers, finish work, and demolition are entered separately
• Wall structure, concealed utilities, loads, and anchorage are not inferred
• Design services, lighting, electrical work, doors, and accessories are excluded unless entered

Editorial Formula Summary

Multiplies entered linear feet by the entered shelving-panel material amount, then adds rods, brackets or hardware, drawer units, finish or patching materials, demolition or disposal, labor, and labor-only work-access components.

Declared Assumptions

• Every quantity, amount, hour, and rate comes from the visible entered scenario
• Material and labor adjustments apply only to their matching components
• Direct equipment, disposal, testing, fabrication, design, permit, and authority allowances remain unchanged
• Zero means the component is not included; it is not replaced by a hidden national price

Editorial Formula Summary

Multiplies entered countertop area by the entered butcher-block material amount and documented waste allowance, applies the matching material adjustment, adds finish and backsplash materials, direct fabrication and removal allowances, and access-adjusted entered labor.