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WA directory
Prefab homes in Washington: modular & ADU builders
Modular, ADU, and factory-built companies serving Washington. Compare listings, then contact builders directly.
In this market
Buyers researching prefab homes in Washington often balance Seattle–Tacoma ADU rules, Eastside lot costs, Spokane and inland projects, and island or coastal delivery constraints. Prefably lists factory-built companies advertising Washington service so you can compare modular, panelized, ADU, and manufactured options with Unclaimed badges and claim links.
Western Washington energy and moisture detailing differs from drier eastern counties; ferry-dependent and mountain-access sites add logistics cost. Confirm whether a design is modular to local code or HUD-code manufactured, and ask about crane access, set windows, and envelope packages suited to your climate zone.
Unclaimed listings are public directory records on Prefably. You can open each company profile to see location, ratings when published, phone when available, and the builder website, then contact them directly. We do not sell your inquiry as a lead. If you run the company, claim this listing free to correct details and mark it as claimed after our review.
Directory
Modular home builders in Washington
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UnclaimedModularManufacturedADU
The Home Boys of Tri Cities
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Showing 40 of 49 builders
Context
More about prefab in Washington
Shortlist from this directory by reviewing ratings where published, specialties, and company websites. Company profiles show ratings and websites; Unclaimed listings remain discoverable until builders claim them free. Prefer Washington modular home builders that document delivery into your county and can provide a factory-vs-site written scope.
Contact builders directly through Prefably. We do not resell leads. Pair this page with our prefab-vs-modular, cost, and financing guides when you are ready to budget site work and lending timelines.
FAQs
Prefab homes in Washington
How many prefab and modular builders does Prefably list in Washington?
As of 2026, Prefably lists 49 factory-built home companies associated with Washington in this directory (claimed and unclaimed). Counts change as companies claim profiles or we add listings — use the cards on this page for the current shortlist, then contact builders directly.
Are ADUs legal across Washington?
HB 1337 generally requires most cities to allow up to two ADUs on single-family lots, with limited owner-occupancy and parking mandates in many cases. Confirm the city before you order.
Do WA prefab builders handle seismic / coastal requirements?
Puget Sound packages commonly engineer for seismic design categories used in the region; Pacific Coast lots add higher wind design. Ask for jurisdiction-specific notes, not a generic West Coast catalog.
Modular vs manufactured in Washington?
Modular on a permanent foundation is typically real-property / construction-to-perm lending. HUD-code manufactured homes use a different label and often a different loan product.
What site issues surprise Washington buyers?
Wet-climate moisture detailing, hillside lots, and crane access in tight Seattle-metro parcels. Get a written factory-vs-site scope and confirm county delivery before you deposit.
How do I find a local modular builder that delivers to my county in Washington?
Use this directory to shortlist companies that advertise Washington service, then ask each one to confirm haul routes, crane access, and set crews for your specific county, not just the nearest metro. Rural lots often need a site visit before a quote is real. Open Prefably profiles for ratings and websites, compare at least three written factory-vs-site scopes, and treat “statewide” marketing as a starting claim, not proof. Pair this page with our prefab-vs-modular and cost guides before you deposit.