Prefably is a free directory that helps US homebuyers find prefab, modular and manufactured home builders. It covers all 50 states with 2,020 companies across 2,291 state listings, so you can browse by state, see which builders serve your area, and compare ratings and reviews before you contact anyone. Listings are free for builders and there is no paywall, no lead-selling and no login for buyers. We also publish an open read-only JSON API and a free CC BY dataset of the whole directory, plus state-by-state research on where US prefab construction is actually concentrated. It is aimed at the awkward early stage of a prefab project, when you know roughly what you want but have no idea who near you actually builds it.
Prefab and modular housing in the US is a genuinely fragmented market. Builders are mostly small regional operations, many have thin web presence, and there was no single place to answer the first question a buyer actually has: who builds prefab homes near me? The information existed, but scattered across state association member lists, old forum threads and manufacturer sites that never say where they deliver. We built Prefably to make that searchable by state and free on both sides, then opened the underlying data as a public API and a CC BY dataset so other people can build on it instead of scraping it.