We prefer primary public data and official program pages. This registry explains the major source families behind HomeCostGrid—and what they do not prove.
Federal, state and local releases, rules and official datasets.
Utilities, manufacturers, insurers, retailers and program administrators for their own terms.
Standards bodies and established professional organizations, with conflicts noted.
Used for context or discovery, then traced back to the best available original source.
HomeCostGrid combines national baselines, regional price and labor context, location factors and user-selected scope. We preserve low, expected and high ranges because a dataset cannot see the exact roof, wiring, access, contractor schedule or written bid.
The canonical Project Decision Matrix research hub explains the 9,945 generated state-control applications and five separate national QA modules. It does not present them as 9,950 independently observed local facts.
Use the release manifest for data, schema and publication versions, exact field lists, distribution counts, limitations and SHA-256 fingerprints. Use the source-operations ledger for last-check dates and stable, changed, dead, superseded, review-due or unreachable states.
Approved semantic hashes compare the configured main content, identity anchors, visible text and meaningful resources; decoded response-body hashes are separate diagnostics because page chrome can change independently. Redirects fail closed. An automated access failure remains unreachable until a human review determines otherwise. Neither hash is an archived agency copy, and the endpoint does not claim immutable historical archives.
Source pages and calculators show review dates where practical. Government datasets can describe an earlier measurement period even when released later. We distinguish the source release from the real-world period whenever that difference matters.
State or metro data cannot prove a city permit, utility provider, insurance quote, tax bill, broadband service or contractor price for one address. Local pages identify the next official check instead of inventing precision.
Send the page URL, source link and the specific figure or statement through our contact form. Material changes are handled under the Corrections Policy.
These pages pick up where this one leaves off, so you can answer the next question without starting over.
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