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Turnkey accessory dwelling units engineered by BOSS Homes in Montebello, California. Code-compliant from day one. From intro call to move-in in 4 to 9 months.
Durasheds offers BOSS Homes ADUs to homeowners — Built On Site Systems — a California prefab housing manufacturer with a state contract, named municipal projects, and three generations of building-product engineering behind it.
Awarded by the Department of General Services for emergency cabin housing across the state.
Engineered, tested, and explicitly permittable under IBC and CBC. Stamped engineering drawings provided for every order.
Short freight, in-state code expertise.
San José, CA · 2025
Modesto, CA
San Francisco, CA
Los Angeles County, CA
The BOSS system combines the speed of prefab with the flexibility of site-built — without cranes, volumetric modules, or special transport permits.
Cold-rolled galvanized steel framework, lightweight PIR insulated core, gypsum board interior and fiber-cement exterior — all factory-installed.
Framing, insulation, sheathing, and rough mechanical, electrical, and plumbing — all built into the panel before it ships. On-site work is connecting, not constructing.
Panels arrive on standard pallets. No cranes, no road closures, no volumetric-module permits. No oversized transport needed.
Framing, insulation, drywall, MEP — all done on-site, in sequence, weather-dependent. 12–18 months in California.
Built complete in a factory, then shipped on an oversized load. Crane required to set. Limited by transport permits and lot access.
Best of both: factory precision, no crane, no oversized transport. Panels lock together on site. 4–9 months total.
Every BOSS model is California-engineered, CBC-compliant, and priced as a typical installed project including civil work and assembly.
A single accountable team handles design, permitting support, factory production, delivery, and assembly.
30 minutes with our team to talk through your lot, goals, budget, and timeline. Visit our Montebello Office in person if you can.
We review your jurisdiction's ADU rules, lot conditions, and zoning to confirm what's buildable. Model selection and configurator session.
Final plan locked. Place the order. Stamped permit set prepared for your city's submittal.
Submit to your city. LA permits run 60-90 days under SB 543. Foundation work runs in parallel.
Your panels are produced in Montebello while utilities are trenched and the foundation is set. The two phases run in parallel.
Panels arrive on pallets. Structural raising in days. Interior finish, MEP terminations, inspections, certificate of occupancy.
Honest numbers, not brochure numbers. A stick-built ADU in California takes 12 to 18 months. Volumetric-modular runs 8 to 12 months but still needs cranes, oversized transport, and broader lot access. Panelized BOSS, with permits and production running in parallel, brings it down to 4 to 9 months.
ADUs typically generate $1,500–$3,500 per month in California rental income and lift property value 20–35%. Pair the BOSS installed price with realistic rent for your zip and the math gets interesting fast.
| BOSS | Abodu | Villa Homes | Samara | |
|---|---|---|---|---|
| Installed price (2-BR sqft) | $228,395 | ~$425,000 | ~$320,000 | ~$439,000 |
| Contract to move-in | 4–9 months | 8–10 months | 6–9 months | 8–12 months |
| Construction system | Panelized + integrated MEP | Modular box | Panelized / ReadyBuilt | Modular box |
| CA Building Code compliant | Yes (IBC + CBC) | Yes | Yes | Yes |
| CA state contract / municipal projects | Yes — CA DGS | No | No | No |
| Crane / oversize transport required | No | Yes | No | Yes |
California's 2026 ADU reforms (AB 462, AB 1154, SB 543) tightened permit timelines and expanded by-right ADU rights statewide. Here's the short version, with deeper guides for each jurisdiction.
21–30 day permits on pre-approved plans (LADBS Standard Plan Program). City of LA leads California in annual ADU permits. Impact fee exemption on ADUs under 750 sf.
Read the LA guide →3–6 month timelines in coastal zones (cut in half by AB 462). 15-day completeness deadline under SB 543.
Read the San Diego guide →By-right ADUs up to 1,200 sf detached. Coastal review streamlined. State 60-day approval rule applies.
Read the SF guide →60-day permit window under state law. Up to $40K CalHFA ADU grant when program funding is open. No parking requirements. Impact fee waiver on ADUs under 750 sf.
Read the Sacramento guide →Active ADU expansion zones. Cherry Avenue community delivered with BOSS panels. Pre-approved plans available.
Read the San José guide →State-mandated 60-day permit window applies. Long Beach has standardized ADU plans in development for faster approval paths. State by-right rules (1,200 sf detached, 4-ft setbacks) apply on most R1 lots.
Read the Long Beach guide →One ADU + one JADU allowed by-right on most single-family lots. Multifamily properties may qualify for additional units under SB 1211. Pre-approved plan library expanding.
Read the Oakland guide →AB 462, AB 1154, SB 543 explained. 60-day mandatory decision. CalHFA grant program (up to $40K when funded).
Read the California overviewTell us about your project. We'll come back with a model recommendation, an all-in installed cost, a permit roadmap for your jurisdiction, and a realistic 4–9 month schedule.