Transparent assumptions are more useful than a mysterious score.

1. Scope before price

Each checker begins with cost drivers a homeowner can reasonably identify: equipment type and capacity, project size, access constraints, included extras, urgency, and ZIP-code region. A result is only as relevant as those selections.

2. Component ranges

Equipment, labor, materials, permits, disposal, access, and optional work are represented as separate low-to-high allowances. Components are added—not hidden inside a proprietary score—so users can see why the range moved.

3. ZIP-to-region adjustment

A recognized ZIP is mapped to a county and then to its Core Based Statistical Area. The model applies the U.S. Bureau of Economic Analysis 2024 Regional Price Parity for that metropolitan area to labor and field-service components only. Nonmetropolitan ZIPs use the corresponding statewide RPP; ZIPs outside the covered dataset use the national baseline. Equipment and material allowances are not multiplied by this factor.

The regional basis and factor are displayed in every report. BEA RPP measures the general regional price level relative to the nation; it is not a contractor-bid database, a trade-specific wage index, or a guarantee that two ZIPs within one metro have identical bids.

4. Quote comparison

A quote inside the modeled range is marked “within estimated range.” A quote outside the range is not automatically unfair or fraudulent. The report instead explains the difference and suggests scope items that may justify it. Unusually low offers trigger an exclusion check rather than an accusation.

5. Geography and data sources

• BEA Regional Price Parities: 2024 metro and state price levels, released in February 2026.
• NBER county-to-CBSA crosswalk: based on Census delineations.
• Curated US ZIP dataset: ZIP, county-FIPS, city, and state reference data, used under CC BY 4.0.

ZIP data is a lookup convenience, not a legal boundary. The Census Bureau explains that postal-city and ZIP areas can cross municipal boundaries, so QuoteVerity never treats a ZIP as proof of the controlling city, county, utility, or code jurisdiction.

6. Service reference framework

Cost allowances are broad national planning ranges reviewed against current public consumer and technical guidance. Scope and safety logic follows the ENERGY STAR HVAC quality-installation framework, the U.S. EPA air-duct cleaning guide, and the U.S. Department of Energy's tankless water-heater sizing guide. These sources describe scope, sizing, safety, and cost drivers; they do not provide a binding local bid.

7. Permits, codes, and licensing

Building, mechanical, plumbing, electrical, fuel-gas, energy, tree, right-of-way, and contractor rules may be adopted or enforced at state, county, city, district, utility, or address level. The result therefore provides a project-specific verification checklist but does not claim that a permit is or is not legally required. Users should confirm the street address and scope with the authority having jurisdiction before work begins.

8. Known limitations

• No property inspection, address-level jurisdiction lookup, or physical measurement.
• No verification of concealed damage, structural conditions, final equipment sizing, code requirements, tax, or current inventory.
• No local transaction feed, contractor invoice database, or real-time labor quote.
• No contractor licensing, insurance, reputation, or workmanship assessment.
• ZIPs may cross legal jurisdictions, and a metro RPP is a regional planning adjustment rather than a city-specific contractor price.
• Unusual access, emergency supply conditions, financing, premium brands, negotiated discounts, and scope omissions can move a real quote outside the range.

Review date

Model assumptions and consumer-facing language were last reviewed in August 2026. A future review may change ranges or components; results should be saved only as a point-in-time planning reference.