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 doing it in coastal California. The lots are bigger, the summers are brutal, and many homes built between 1950 and 1980 have electrical panels that were never meant to carry a second living unit. We plan for that from day one. Whether you’re looking at a detached ADU for rental income or a room addition for family, the plan starts with a written price and a clear scope of work. Call (831) 231-0809 to talk through what’s possible on your lot.
Why San Bernardino Homes Are Different
Most San Bernardino homes sit on lots of 7,500 square feet or more, which is genuinely good news for ADU placement. You have room to work with. The catch is what’s already in the house. Wood-frame construction with stucco exteriors was the standard for decades, and a lot of those homes still run on 100-amp or even smaller electrical panels. An ADU with its own kitchen, mini-split system, and laundry will usually need a panel upgrade before anything else happens. We flag that during the estimate, not after the walls go up.
Foundation age matters too. Some of these older slabs and perimeter footings have settled unevenly, and a detached ADU needs its own foundation anyway, so we check what’s there before we commit to a design. The other thing we plan around is heat. San Bernardino regularly pushes past 100°F in summer, so we spec high-efficiency insulation and cool roofing as standard, not as an upsell. It’s the difference between a unit that’s comfortable in August and one that runs the AC nonstop. For a plain-language walkthrough of what this means for your property, see our ADU Builders in San Bernardino page.
Our Main San Bernardino Services
These are the three projects San Bernardino homeowners call us about most. Each has its own page with pricing, timelines, and the local details that affect the work.
ADU Builders in San Bernardino
A detached ADU on a big San Bernardino lot is often the highest-return project we build. You get a separate address, a private entrance, and real rental potential. The work involves site prep, foundation, utility runs from the main house, and a full build-out to code. On many older lots, we also have to upgrade the main panel and bring the service line up to current standards. Flood zones near the Santa Ana River add grading and drainage steps that a less local builder might miss. ADU Builders in San Bernardino
Home Addition Contractor in San Bernardino
A home addition means expanding the footprint of the house itself: a new bedroom wing, a larger kitchen, a second living area. These jobs tie directly into the existing roofline and foundation, so we spend extra time on the structural connection. Older San Bernardino homes need careful roof transitions and matching stucco work so the addition looks like it was always there. We also plan for the heat, with insulation and window placement that keeps the new space livable in July. Home Addition Contractor in San Bernardino
Room Addition Contractor in San Bernardino
A room addition is the smaller, simpler version: one room, one purpose. It could be a home office, a fourth bedroom, or a playroom that gets the kids’ toys out of the living room. Because these jobs are smaller, the budget conversation is usually about doing it without over-building. We still handle the same checks, panel capacity, foundation condition, drainage, but we size the solution to the project. A room addition shouldn’t require a full-panel replacement unless the math says it does. 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’re authorized to build with Cover, Dvele, and Boxabl, which means you’re not locked into one construction method. Prefab panels can shorten on-site build time significantly. See what’s available and what makes sense for your lot on our brands page.
Pricing for ADU Company in San Bernardino, CA
| Service | Typical range in San Bernardino |
|---|---|
| Detached ADU (1 bed, 1 bath) | $180,000 – $260,000 |
| Detached ADU (2 bed, 1 bath) | $240,000 – $340,000 |
| Garage conversion ADU | $110,000 – $160,000 |
| JADU (attached junior unit) | $80,000 – $130,000 |
| Single-room addition | $55,000 – $95,000 |
| Two-room addition | $95,000 – $160,000 |
| Primary suite addition | $110,000 – $180,000 |
| Electrical panel upgrade (200A) | $3,500 – $6,500 |
| Foundation repair (pier and beam) | $4,000 – $12,000 |
What pushes the number higher in San Bernardino is usually one of three things: a panel upgrade, foundation work on an older lot, or flood-zone drainage requirements near the Santa Ana River. Every estimate includes a written price before any work starts, so the number we quote is the number you plan around.
Neighborhoods We Serve in San Bernardino
We work across the city, from the older grid streets near downtown to the larger lots up toward the foothills. Each neighborhood has its own mix of home ages and lot shapes, so we treat every site visit as its own pull-up-the-measurements job.
- North Park
- Verdemont
- Arrowhead
- Del Rosa
- Ridgeline
Most San Bernardino neighborhoods are within a short drive of our Inland Empire office, so scheduling a free estimate usually happens within a few business days.
Service Area – Cities Near San Bernardino
Beyond San Bernardino itself, our crews cover the surrounding Inland Empire communities. If you’re in Loma Linda, CA, Grand Terrace, CA, Bloomington, CA, or Crestline, CA, we can schedule the same written-price estimate and the same 365-Day Done Right Promise on your project.
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
Yes, we pull all required permits and manage inspections as part of the project. San Bernardino has its own building department and plan-check process, and we handle that paperwork end to end. You’ll see the permit status in our real-time tracking, not as a surprise later. Call (831) 231-0809 for specifics on your property.
After the estimate and a signed plan, typical start times run four to eight weeks, depending on plan-check timing and material availability. Prefab options like Boxabl or Cover can compress that timeline since much of the structure arrives ready to assemble. Call (831) 231-0809 to get a realistic schedule for your lot.
Yes, we build on flood-zone lots. These projects may need additional elevation, drainage, or flood-resistant materials depending on the FEMA designation for your specific parcel. We’ll identify that during the estimate and include any required steps in the written price, so nothing gets added later. Call (831) 231-0809 for a free site review.
Ready to talk numbers? Call (831) 231-0809 for a free estimate on your San Bernardino ADU or addition project, or head back to our home page to see more about how we work.
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
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N."Garage conversion into a guest suite. I could see the permit status in the app, which made it painless."
- Rick F.
