How We Check These Facts

This page lists every public document that supports a fact on this site, one entry per document, with the date it was checked. Each page's source note counts its own documents and points here.

The sources are government agencies, state statutes and regulations, standards bodies, utilities, and insurance research groups. A cost guide, a directory, or a contractor's marketing page never counts as a source here.

Time-bound records, such as code editions, insurance rules, and repair loan programs, carry a recheck date in our files, between 3 and 24 months out. A figure with no readable source stays off the site.