Evidence, dates, and limitations—kept together.

Production source roles

Government labor data supplies matching state trade indexes; national product and nonlabor records never become ZIP prices. Window replacement adds the Glazier occupation and reuses Carpenter only for selected trim and bounded opening preparation. Water Heater replacement reuses Plumber and Electrician only for their declared work. Solar uses Solar PV Installer and reused Electrician labor only for their owned work. ENERGY STAR, DOE, IRS, NFRC, and EPA define performance, incentive, and safety context without becoming local price inputs or promises.

Manufacturer and industry references support product, method, coverage, assembly, and installation boundaries. Identifiable retailer observations support dated national product-only ranges. Broad installed-cost guides for all ten calculators are retained only to check whether final project ranges are obviously outside market context. Their prices, component splits, labor rates, permit allowances, local logic, and formulas are not production inputs.

Roof-covering inclusion boundary

The Phase 3B baseline includes only the primary field roof-covering product. Underlayment, leak barrier, starter, ridge cap, drip edge, flashing, fasteners, sealants, delivery, tax, waste, labor, tear-off, and disposal are excluded. Waste is applied once to the product purchase quantity.

The six dollar baselines carry stable documented-assumption IDs. Asphalt coverage and index updates retain GAF and BLS sources; other material categories remain explicit low-confidence assumptions rather than borrowing an unrelated index or competitor price.

Removal, disposal, and accessories

Tear-off dollar rates, national tipping and hauling ranges, accessory unit costs, geometry fallbacks, permit fallback, and deck costs are explicit dated assumptions. The result exposes the selected existing material, layer count, removed squares, estimated debris tons, accessory inclusion, permit source level, and data version.

The additional-cost snapshot is roof-additional-costs-2026-07-v1, effective July 17, 2026. Its generator preserves the curated-input checksum, normalized record checksum, factor checksum, row counts, and validation status.

Calibration references

Fixr, HomeGuide, Modernize, and Angi are recorded as low-confidence secondary references for broad installed totals, roof-area scaling, and material ordering. The calibration record preserves retrieval date, comparison assumptions, stated scope, geographic scope, and limitations. Mixed-scope totals are never treated as equivalent to this calculator's itemized result.

The committed calibration matrix is roof-calibration-2026-07-v1. It validates 25 offline scenarios against safe behavioral ranges and a deterministic output checksum; it makes no live request to a competitor or cost guide.

HVAC equipment and additional-cost boundary

The equipment snapshot covers equipment only. Installation, removal, disposal, ducts, controls, electrical or gas work, permits, refrigerant and connection materials, line sets, drains, pads, lifting, tax, and incentives remain excluded from equipment prices and are owned separately where supported.

The production equipment metadata is hvac-equipment-prices-2026-07-v2. It corrects single-source pricing-method labels without changing any dollar factor and requires review after July 17, 2027. Labor remains bls-oews-2025-hvac-v1; additional costs remain hvac-additional-costs-2026-07-v1.

HVAC calibration references

HomeGuide HVAC, AC, and furnace guides plus Bryant's 2026 pricing guide are recorded as low-confidence secondary comparisons. The calibration fixture preserves system scope, capacity and efficiency assumptions, installed-cost range, inclusions, geography, retrieval date, and limitations. No value or formula from those pages enters production.

hvac-calibration-2026-07-v1 validates 32 deterministic estimates and one invalid-input case, with an output checksum and controlled checks for capacity, efficiency, labor, geography, ducts, additional work, permits, source roles, and stale-data behavior.

Bathroom product and additional-cost boundary

Bathroom product records cover national vanities, ordinary tops and sinks, faucets, toilets, tubs, manufactured showers, tiled-shower products, glass, resilient flooring, ceramic and porcelain tile, lighting, fans, mirrors, and accessories. Installation labor, demolition, disposal, permits, and selected subfloor work remain separate owners.

The product snapshot is bathroom-products-2026-07-v1 and requires review after July 17, 2027. Five-trade labor remains bls-oews-2025-bathroom-trades-v1; additional costs remain bathroom-additional-costs-2026-07-v1. Natural stone, custom spa work, and automatically assumed hidden damage are excluded.

Bathroom calibration references

Angi, HomeGuide, and Fixr cost guides plus the 2025 Houzz Bathroom Trends Study are recorded as low-confidence secondary comparisons. The fixture preserves bathroom type and size, remodel scope, finish context, demolition, fixtures, tile, plumbing, electrical, permits, geography, stated bounds, retrieval date, and limitations. No external price or allocation enters production.

bathroom-calibration-2026-07-v1 validates 46 deterministic estimates and three invalid-input cases. It checks scope, finish, geometry, trade isolation, state and national fallback, product stability, tile and waterproofing ownership, demolition, access, hidden work, permits, stale-data behavior, and an output checksum.

Kitchen product and additional-cost boundary

Kitchen product records cover broad national cabinet finishing, refacing, stock and semi-custom replacement, hardware, laminate, butcher-block, quartz and granite countertops, common appliance selections and packages, sink and faucet, disposal, backsplash, flooring, lighting, ventilation, and island products. Installation, utility work, fabrication, cutouts, delivery, removal, haul-away, disposal, permits, and selected wall or subfloor work remain separate owners.

The product snapshot remains kitchen-products-2026-07-v1 and requires review after July 17, 2027. The additional-cost snapshot is kitchen-additional-costs-2026-07-v2; it changes only category ownership metadata so cabinet, countertop, appliance delivery, backsplash tile, and floor tile cannot share ambiguous production categories. Dollar values are unchanged. Labor remains the unchanged bls-oews-2025-bathroom-trades-v1 snapshot.

Kitchen calibration references

Angi, HomeGuide, and Fixr cost guides, the 2026 Houzz Kitchen Trends Study, and the 2026 NKBA Kitchen & Bath Industry Outlook are recorded as secondary comparisons. The fixture preserves kitchen size, scope, finish, cabinet, countertop, appliance, surface, trade, demolition, permit, geography, stated-range, retrieval-date, and limitation fields. No external price, share, forecast, or formula enters production.

kitchen-calibration-2026-07-v1 validates 77 deterministic estimates and three invalid-input cases. It checks all scopes, five sizes, three finishes, five trade anchors, fallbacks, cabinets, countertops, appliances, surfaces, layout, demolition, access, permits, exact-quantity boundaries, stale data, ownership, and an output checksum.

Flooring product and additional-cost boundary

Flooring product records cover LVP, laminate, carpet, solid and engineered hardwood, ceramic and porcelain tile, selected underlayment or padding, moisture barriers, glue-down LVP adhesive, tile setting materials, trim, and hard-surface stair nosing. Installation labor, removal, disposal, preparation, limited repair, moving, permits, and supported additional work remain separate owners.

The product snapshot is flooring-products-2026-07-v2 with 51 records and requires review after July 18, 2027. It adds the omitted glue-down LVP adhesive without changing any prior product value. Flooring labor remains bls-oews-2025-flooring-trades-v1 plus unchanged tile and carpentry records from bls-oews-2025-bathroom-trades-v1; additional costs remain flooring-additional-costs-2026-07-v1.

Flooring calibration references

Angi, HomeGuide, HomeAdvisor, Fixr, and This Old House cost guides are recorded as low-confidence secondary comparisons across broad material ordering, installation, replacement, removal, support materials, preparation, and moving scopes. Each record preserves scope, material categories, inclusions, exclusions, geography, retrieval date, and limitations. No external price or formula enters production.

flooring-calibration-2026-07-v1 validates 79 deterministic estimates and four intentional invalid-input cases. It checks seven materials, both project types, six areas, three finishes, four trade anchors and fallbacks, installation methods, existing floors, substrates, complexity, stairs, support materials, removal, disposal, access, moving, permits, source roles, stale data, ownership, and an output checksum.

Interior Painting product and additional-cost boundary

Interior Painting product records cover Budget, Standard, and Premium wall paint plus separate ceiling paint, trim and door enamel, and primer. The v2 product snapshot labels all six broad price ranges as documented assumptions because manufacturer references support coverage and application context, not the entire dollar range. Product dollars and coverage are unchanged.

The product snapshot is interior-paint-products-2026-07-v2 with six records and requires review after July 18, 2027. Painter labor remains the unchanged 51-state/District portion of bls-oews-2025-bathroom-trades-v1; 20 additional-cost records remain interior-paint-additional-costs-2026-07-v1.

Interior Painting calibration references

Angi, HomeGuide, HomeAdvisor, Fixr, and This Old House cost guides plus the PaintDeck competitor calculator are recorded as low-confidence secondary comparisons. Each record distinguishes floor area from paintable surface area and preserves walls, ceilings, trim, doors, preparation, primer, coats, occupancy, labor, materials, geography, stated range, retrieval date, and limitations. No external rate, multiplier, allocation, or formula enters production.

interior-painting-calibration-2026-07-v1 validates 63 deterministic estimates and six intentional invalid-input cases. It checks all scopes, six sizes, three tiers, supported surfaces, exact quantities, wall heights, access, conditions, colors, primer, coats, occupancy, protection, limited work, actual Painter anchors, ZCTA and state resolution, national fallback, ownership, stale data, and an output checksum.

Exterior Painting product and additional-cost boundary

Exterior Painting product records cover Budget, Standard, and Premium siding and masonry coatings plus separate trim and feature paint, general primer, masonry primer, and stain-blocking primer. All broad product price ranges remain documented assumptions; manufacturer sources support compatibility, coverage, application, preparation, and vinyl limitations rather than installed project prices.

The product snapshot is exterior-paint-products-2026-07-v1 with 10 records and requires review after July 18, 2027. Painter labor remains the unchanged 51-state/District portion of bls-oews-2025-bathroom-trades-v1; 34 additional-cost records remain exterior-paint-additional-costs-2026-07-v1.

Exterior Painting calibration and vinyl-siding references

Angi, HomeGuide, HomeAdvisor, This Old House, and Forbes Home cost guides plus the RemodelingCalculator.org competitor calculator are recorded as low-confidence secondary comparisons. Each record preserves paintable-area basis, scope, surface, stories, access, preparation, washing, primer, coats, features, labor, materials, geography, stated range, retrieval date, and limitations. No external rate, multiplier, allocation, or formula enters production.

Sherwin-Williams, Behr, and PPG manufacturer guidance supports the conservative painted-vinyl boundary. Only sound previously painted vinyl is supported, users must confirm a compatible coating and color, and generic light-to-darker planning is rejected rather than assuming approval.

exterior-painting-calibration-2026-07-v1 validates 78 deterministic estimates and nine intentional invalid-input cases. It checks all scopes, both area methods, six sizes, five story choices, six surfaces, six conditions, three washing levels, six color paths, three tiers, primer, coats, trim and features, access, equipment, exact quantities, actual Painter anchors, ZCTA and state resolution, national fallback, ownership, stale data, painted-vinyl safety, and an output checksum.

Window product and additional-cost boundary

Window product records cover five frame materials, three product tiers, four size bands, six style adjustments, three glass packages, optional tempered, privacy, and impact-resistant glass, flashing, insulation, sealants, trim, bounded repair materials, and cleanup supplies. Installation, removal, disposal, hauling, trade labor, access equipment, and permits remain separate owners.

The product snapshot is window-products-2026-07-v1 with 78 records and requires review after January 18, 2027. Glazier labor is bls-oews-2025-window-trades-v1; Carpenter labor reuses only the matching portion of bls-oews-2025-bathroom-trades-v1; 19 additional-cost records remain window-additional-costs-2026-07-v1.

Window performance and calibration references

ENERGY STAR Version 7.0 and NFRC explain product-specific U-Factor, SHGC, air leakage, and certification context without supplying price or guaranteeing savings, climate compliance, code, incentives, or payback. EPA supplies the concise pre-1978 lead-safe warning boundary. Manufacturer material and installation references define insert and full-frame scope; product observations remain product-only.

HomeGuide, Angi, This Old House, HomeAdvisor, Modernize, and RemodelingExpense are secondary comparisons only. window-replacement-calibration-2026-07-v1 validates 76 deterministic estimates and 10 intentional invalid-input cases across methods, styles, frames, size, dimensions, tiers, glass, groups, counts, finishing, access, trade geography, ownership, and fallbacks with an output checksum.

Water Heater equipment and cost-ownership boundary

The 24 equipment records cover product-only gas storage, electric resistance storage, integrated heat-pump, and gas tankless systems across three planning capacity bands and two compatible equipment tiers. Delivery, Plumber and Electrician labor, removal, disposal, connections, venting, gas, electrical, condensate, accessories, permits, setup, and ordinary cleanup stay outside equipment and retain one documented owner.

Equipment remains water-heater-equipment-2026-07-v1; the 27 additional-cost records remain water-heater-additional-costs-2026-07-v1; and labor reuses bls-oews-2025-bathroom-trades-v1. The model advances from water-heater-replacement-0.1.0 to water-heater-replacement-0.2.0 to enforce equipment/vent compatibility and add the bounded circuit default for gas-to-electric conversion.

Water Heater efficiency and calibration references

DOE consumer-water-heater guidance and ENERGY STAR Version 5.0 provide product-specific UEF, first-hour-rating, flow, configuration, and certification context. The DOE standards adopted in 2024 are labeled with future 2029 compliance dates, not as current requirements. The calculator does not infer certification, code, savings, payback, rebates, credits, or incentives.

HomeGuide, Angi, HomeAdvisor, This Old House, Forbes Home, Fixr, and Homewyse are secondary comparisons only. water-heater-replacement-calibration-2026-07-v1 validates 65 deterministic estimates and 13 intentional invalid-input cases across systems, replacement and conversion paths, capacity, efficiency, locations, access, utilities, removal, permits, trade geography, ownership, fallbacks, and compatibility with an output checksum.

Permit and local-data boundary

No Census permit count, ZIP code, city name, or state factor is converted into a fee. A confirmed user-entered permit amount replaces the national planning range and is labeled user supplied. Actual fees must be checked with the relevant building department.

Confidence

High confidence describes direct authoritative data, such as an official government release. Medium confidence describes useful public or manufacturer context with known limitations. Low confidence marks broad national dollar assumptions, geometry fallbacks, generic material categories, and secondary market checks. Confidence describes evidence quality, not guaranteed accuracy for a specific roof.

Solar production boundary

Solar equipment records are product-only per-watt DC ranges. Installation labor, racking, electrical materials, design, permits, interconnection, panel work, access, overhead, tax, financing, incentives, removal, and roof work remain excluded or separately owned. The audited snapshots are solar-equipment-2026-07-v2 and solar-additional-costs-2026-07-v2, with unchanged dollar values and explicit collection, review, pricing-method, and ownership metadata.

Solar calibration references

DOE's representative 2024Q1 residential rooftop benchmark and seven current installed-cost guides or marketplaces were normalized only for broad gross-cost and cost-per-watt review. Expired federal-credit examples and mixed incentive figures were rejected. solar-installation-calibration-2026-07-v1 validates 69 deterministic estimates and eight intentional invalid-input cases across size, module tier, inverter, roof, access, electrical work, permits, interconnection, geography, confidence, and cost ownership.