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CA directory
Prefab homes in California: modular & ADU builders
Modular, ADU, and factory-built companies serving California. Compare listings, then contact builders directly.
In this market
Searches for prefab homes in California often mix primary homes, ADUs, and panelized infill in the same research session. Prefably organizes statewide factory-built companies so you can compare Prefably listings serving Los Angeles, the Bay Area, San Diego, Sacramento, and the Central Valley without bouncing between lead-gen forms.
California’s Title 24 energy rules, wildfire WUI zones, and city ADU ordinances shape which factory packages make sense. Coastal metros may prioritize ADU and accessory dwelling specialists; inland and Central Valley buyers more often compare volumetric modular and manufactured options for larger lots. Always ask whether a design is modular (local code) or HUD-code manufactured before you talk to a lender.
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 California
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California Backyard Homes
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Custom Living Manufactured Homes
33302 Valle Rd suite 200, San Juan Capistrano, CA 92675, USA
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Clayton Homes of Sacramento
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Factory Direct Housing
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Showing 40 of 54 builders
Context
More about prefab in California
Ground truth for California buyers: factory-built housing sold in-state is regulated through HCD (Housing and Community Development) for manufactured homes and through local building departments for modular set to California Residential Code. Statewide ADU reforms (including AB 2221 and related updates) require cities to allow ADUs with ministerial review in most cases, but HOA design rules, utility capacity, and WUI hardening (ember-resistant vents, Class A roofing, defensible space) still decide which factory packages pencil. Ask for a Title 24 compliance path and, in high fire severity zones, materials and detailing that satisfy local WUI ordinances, not a catalog base package from another climate.
On each Prefably profile, review ratings where available, service area notes, and the builder’s own site for floor plans and plant locations. Open each Prefably profile for ratings and websites; Unclaimed listings stay discoverable until the company claims them free. Shortlist three to five firms, then request written scopes that separate factory price from site work, utilities, and permit support.
Use neighboring-state links and our cost and financing guides when you are ready to budget. Prefably is an independent directory, contact California modular home builders directly from the listings on this page.
FAQs
Prefab homes in California
How many prefab and modular builders does Prefably list in California?
As of 2026, Prefably lists 54 factory-built home companies associated with California 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 everywhere in California?
Yes. State law SB-9 and AB-2221 require every California city to allow at least one ADU and one JADU on single-family lots, with streamlined 60-day approvals. HOA design rules and utility capacity can still block a specific factory package, confirm both before you deposit.
Do California prefab homes meet Title 24 energy code?
Factory-built modules sold in California must meet Title 24 energy requirements for the climate zone. Ask for the compliance path (including solar PV where required on new homes) rather than assuming a national catalog base package qualifies.
Who regulates factory-built homes in California?
HCD regulates manufactured (HUD-code) homes; modular homes set to the California Residential Code are typically permitted through local building departments. Get the code path in writing, lenders and insurers treat the paths differently.
How do wildfire WUI rules affect prefab in California?
In high fire hazard severity zones, expect ember-resistant vents, ignition-resistant cladding, Class A roofing, and defensible-space requirements. Ask builders which WUI packages they have already permitted in your county.
What is the difference between manufactured and modular homes in California?
Manufactured homes are HUD-code units with a federal HUD label, regulated in-state through HCD. Modular homes are built to California Residential Code (or applicable local code) and permitted locally. Search queries like “manufactured homes California” and “modular homes California” are different products, lenders treat them differently.