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
Adding an ADU in San Bernardino is different from adding one in most Southern California cities. Older lots here are often deeper than newer subdivisions, setback rules vary by neighborhood, and the city’s exposure to high summer heat shapes everything from insulation requirements to where a detached unit can sit on the lot. Whether you’re planning a detached ADU behind a 1940s home near Arrowhead Avenue or a garage conversion off Kendall Drive, Sutton ADU Builders gives you a written price before we start and a named, photo-badged crew at your door. Call (472) 248-8213 for a free estimate.
Why San Bernardino Homes Are Different
San Bernardino’s housing stock is older and more varied than most of the Inland Empire. Many homes west of E Street date from the 1930s through the 1950s, which means detached garages at the rear of deep lots, narrow driveway clearances, and electrical panels that often need an upgrade before an ADU can take real load. Newer homes up near Cal State and in Verdemont tend to sit on tighter lots governed by newer subdivision CC&Rs, so a backyard unit there is more likely to be a compact one-bedroom than a full two-story.
Heat is the other factor that changes how we build here. San Bernardino regularly sees summer weeks above 100°F, so we spec higher-R-value insulation than a coastal job would, and we pay close attention to window orientation on south-facing walls. The local permit process also tends to move differently by project type: a garage conversion in an established residential zone is usually a faster review than a detached new build on a hillside parcel near Shandin Hills. We handle both, and we’ll tell you which one your lot is more likely to sail through before you commit to anything.
Our Main San Bernardino Services
Most San Bernardino homeowners call us for one of three projects: a full home addition, a detached or attached ADU, or a single room addition. Each has its own page with local pricing and specifics.
Home Addition Contractor in San Bernardino
A home addition in San Bernardino usually means extending a kitchen, adding a primary suite, or building out a second story on an existing single-level home. Older foundations along Base Line need a soil and footing check before we frame anything; the last thing you want on an aging lot is a new wing that settles differently from the original structure. We lock the full build price in writing before the first tool comes off the truck, so the number you approve is the number you pay. Home Addition Contractor in San Bernardino
ADU Builders in San Bernardino
Detached ADUs here tend to go in two directions: prefab units set on a prepared slab, or site-built units with conventional framing. If your backyard is hard to reach for a crane, a panelized build from Dvele or a site-built frame is usually the smarter path. If access is open, a factory-built unit can cut weeks off the schedule. We’ll look at your lot, measure the actual setback, and give you a straight recommendation. ADU Builders in San Bernardino
Room Addition Contractor in San Bernardino
A room addition is the most common project we quote in San Bernardino: a bedroom over a slab, a home office off the back of the house, or a family room bump-out. On smaller lots in the north end of the city, that often means working within just a few feet of the property line, so we coordinate the zoning review as part of the fixed price instead of handing you a surprise line item later. Room Addition Contractor 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 several modular and panelized ADU lines, including Cover, Dvele, and Boxabl. When you’re comparing products, we’ll walk you through which one actually fits a San Bernardino lot – not just which one looks best in a catalog photo. See our brands for the full list we service.
Pricing for ADU Company in San Bernardino, CA
| Service | Typical range in San Bernardino |
|---|---|
| Detached ADU (site-built, 400 – 600 sq ft) | $180,000 – $320,000 before site work |
| Garage conversion ADU (attached or detached) | $90,000 – $160,000 depending on existing slab and electrical |
| Room addition (standard single room, 200 – 400 sq ft) | $60,000 – $110,000 with foundation and finishes |
| Home addition (kitchen extension or primary suite, 400 – 800 sq ft) | $140,000 – $260,000 depending on plumbing and roofline |
| Permit and site preparation (grading, foundation, utility stubs) | $15,000 – $45,000 depending on lot slope and access |
What pushes a San Bernardino ADU or addition price up is usually one of three things: a lot with real slope, an electrical panel that needs replacement before inspection, or an older home whose roofline won’t tie in cleanly without extra framing. We put every one of those items in the written quote before you sign anything, so there’s no mid-build surprise. Every project gets a fixed price in writing before we begin, and that’s not a marketing line; it’s the rule.
Neighborhoods We Serve in San Bernardino
We work across San Bernardino, from the hillside streets near Shandin Hills to the older neighborhoods off Highland Avenue and the flats east of Waterman. A few areas we quote regularly:
- Verdemont
- North Park
- Arrowhead
- Shandin Hills
- Delmann Heights
Our crews are local to the Inland Empire, so most neighborhood visits can be scheduled within a few business days, and you’ll always know exactly who is arriving before they knock.
Service Area – Cities Near San Bernardino
Our San Bernardino crews also cover nearby cities when the work crosses a border: Loma Linda, CA, Highland, CA, Rialto, CA, and Colton, CA. If you’re right at the edge of the city, give us a call and we’ll tell you which crew covers your street.
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 detached ADU quotes get scheduled within a week. During drawn-out permit reviews, we can also walk your lot earlier to flag any red flags before you pay for full plans.
Most San Bernardino homes aren’t in an HOA, but some planned communities on the north side have design-review rules. We’ll check the specific covenants for your lot and tell you what they block before you start.
Your project gets a named, photo-badged Threshold Verified crew from demo to final walkthrough. If a technician changes mid-project, you’ll get the new name and photo before they arrive.
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
"They handled the drawings and the permit paperwork for us. All I had to do was pick the finishes."
- Rosa M."Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R.
