A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in San Bernardino, CA
Fielding ADU Builders handles accessory dwelling units, garage conversions, and room additions throughout San Bernardino, CA. We coordinate from the Inland Empire office, and our background-checked crews work locally. San Bernardino jobs carry specific considerations: older housing stock, summer heat that stresses framing and insulation choices, and hillside lots where drainage and foundation prep need more attention. If you’re pricing an ADU or addition in San Bernardino, call (361) 315-4177 for a written estimate.
Why San Bernardino Homes Are Different
San Bernardino’s housing stock runs older than most of the Inland Empire. Many homes north of Highland Avenue and around Arrowhead were built before 1970, which means undersized electrical panels, pier-and-post foundations on some hillside lots, and floor plans that were never designed for a second dwelling. An ADU or addition here usually starts with a service-panel check and a foundation look, not just framing.
The terrain shapes the work, too. Homes in the foothills above the 215 or off Waterman Canyon Road sit on sloped lots where drainage and retaining come into play. A backyard ADU on a flat lot near Perris Hill Park is a straightforward build; one on a hillside pad above the city calls for more excavation and sometimes a setback variance – the city’s written permission to build closer to the property line than the standard rule allows. Summer temperatures also push us toward insulation and window packages that hold up through August.
Permitting runs through the City of San Bernardino. We pull permits by the book on every job, and the written price we hand you before work starts includes the permit line item we know about. If the inspector finds something hidden, we put the change in writing before we proceed.
Our Main San Bernardino Services
Most San Bernardino homeowners call us about one of these three jobs. Each has its own page with service-level pricing and detail.
Room Addition Contractor in San Bernardino
A room addition in San Bernardino usually means tying new square footage into a 1960s or 1970s frame and roof line. The work requires matching existing stucco or siding, extending HVAC where the original system was sized tight, and often upgrading the panel to carry the new load. On homes near Hunt’s Lane or Del Rosa, we also watch for asbestos-era materials that need handling before demolition. Room Addition Contractor in San Bernardino
Garage Conversion Contractor in San Bernardino
Garage conversions in San Bernardino are popular because so many homes have detached garages from the 1950s and 60s that sit underused. The job typically involves pouring a new floor over the slab, reframing the garage door opening, insulating walls that were never insulated, and bringing the electrical up to residential code. Some conversions near Central City also need a sewer tie-in extension. Garage Conversion Contractor in San Bernardino
ADU Builders in San Bernardino
Backyard ADUs in San Bernardino run from prefab units dropped on a slab to conventional site-built structures. Prefab platforms like Cover and Dvele can shrink the on-site schedule, which matters in a city with hot summers. Conventional builds using James Hardie siding give more design latitude on lots with HOA rules. We walk each property before quoting because San Bernardino lots vary from wide and flat to narrow and sloped. ADU Builders in San Bernardino
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in San Bernardino
We work with prefab and modular platforms including Abodu, Cover, Mighty Buildings, and Boxabl, plus conventional builds using James Hardie siding and Tuff Shed-style structures. Turnaround on parts and panels from these brands is predictable, so we build the schedule around their lead times. Our brands
Pricing for ADU Company in San Bernardino, CA
| Service | Typical range in San Bernardino |
|---|---|
| Garage conversion to studio ADU | $85,000 – $135,000 |
| Detached one-bedroom ADU (conventional) | $145,000 – $225,000 |
| Detached one-bedroom ADU (prefab) | $130,000 – $195,000 |
| Two-bedroom ADU | $190,000 – $310,000 |
| Primary bedroom suite addition | $95,000 – $165,000 |
| Family room addition | $110,000 – $190,000 |
| Kitchen extension | $85,000 – $150,000 |
| Second-story addition (per sq ft) | $220 – $320 per sq ft |
Prices in San Bernardino push higher on sloped lots where excavation and retaining add cost, and on older homes where the panel, sewer, or foundation needs work before the new build starts. Whatever the number is, we put it in writing before any work begins – the price you approve is the price on the final invoice.
Neighborhoods We Serve in San Bernardino
We run jobs across San Bernardino, from the flats near Perris Hill to the foothills below Highway 18. Our crews are local to the area, so response times on estimates are same-week for most neighborhoods.
- Del Rosa
- Arrowhead
- Central City
- Seccombe
- Blair Park
Service Area – Cities Near San Bernardino
Besides San Bernardino proper, we cover neighboring communities, including Loma Linda, CA, Highland, CA, Rialto, CA, and Colton, CA. If you’re on a hillside lot or in an older neighborhood anywhere in the area, call for a straight estimate.
Serving San Bernardino, CA - Our Local Coverage Area
We’re based in the San Bernardino area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in San Bernardino
Most San Bernardino properties get a site visit within the same week you call. We schedule around your availability, and the written estimate follows the visit. Call (361) 315-4177 to set a time.
Some do, particularly in the foothill communities where design review applies. We check HOA requirements as part of the bid, and we flag any conflict before you commit. The price we write assumes what the HOA and city both allow.
Every job we build carries a written one-year guarantee. If workmanship fails within 365 days, we come back at no charge and make it right. That guarantee is on paper before the first nail goes in. Call (361) 315-4177 for details and a free written estimate.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What San Bernardino Customers Say
"Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B."Honest feedback on what the lot could fit. Told me up front what would fit on the lot and what the setbacks would allow."
- Rita C."Clear price breakdown. Change orders were all in writing."
- Hal P.
