A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Claremont, CA
Adding an accessory dwelling unit or extra room to a Claremont home means working with a city that has its own idea about how a neighborhood should look and feel. We’re Sutton ADU Builders, and we handle detached ADUs, garage conversions, and room additions across Claremont with written pricing you’ll see before any work starts. If you’re trying to figure out what’s actually possible on your lot, call (472) 248-8213 and we’ll walk you through it.
Why Claremont Homes Are Different
Claremont is a city of mature trees, older housing stock, and a design review process that pays close attention to what gets built. Many homes north of Foothill Boulevard date from the 1920s through the 1950s, which means narrow lots, detached garages set at the back of the property, and foundation conditions that can add real cost to an ADU or addition before framing even begins. South Claremont, around the Village and toward the 210, has a mix of mid-century ranch homes and newer builds, but the lots still tend to be tight by Southern California standards.
Setbacks matter here more than in many nearby cities. Claremont’s residential zones impose specific distances between a new structure and the property line, and on a 6,000-square-foot lot, that setback can be the difference between a comfortable one-bedroom ADU and a project that doesn’t pencil out. The city also has a tree protection ordinance that can affect grading and foundation placement if a mature oak sits near your planned build area. We factor that into our site assessments before we give you a number.
Our Main Claremont Services
Most Claremont homeowners we talk to are deciding between three paths: extending the existing home, building a detached ADU in the yard, or converting space that already exists. Here’s what each looks like in Claremont.
Home Addition Contractor in Claremont
A home addition in Claremont usually means expanding a kitchen, adding a primary suite, or pushing out the back of the house to gain a family room. The age of Claremont’s housing stock means we often open a wall and find knob-and-tube wiring or cast-iron drain lines that need replacing, which is exactly why our written price includes a contingency line item rather than springing it on you later. Permitting here goes through the city’s building division, and we handle the drawings, submittals, and corrections. Home Addition Contractor in Claremont
ADU Builders in Claremont
Detached ADUs in Claremont are most common in the neighborhoods around Memorial Park and the wider residential streets east of Indian Hill Boulevard, where backyards are deep enough to accommodate a separate structure. We build stick-framed ADUs and also work with prefab manufacturers like Cover and Dvele when site conditions favor a factory-built shell. Claremont’s design review can be particular about rooflines and exterior materials, so we spec finishes that match the main house rather than fighting the city’s expectations. ADU Builders in Claremont
Room Addition Contractor in Claremont
A room addition in Claremont often means a bedroom, home office, or a second bathroom added within the existing footprint where possible, or a modest bump-out where the lot allows. On the older streets north of the colleges, we see a lot of enclosed porches and converted garages that were never permitted, and part of our job is bringing those spaces up to current code while adding usable square footage. We handle the structural engineering, the permit package, and the close-out inspection. Room Addition Contractor in Claremont
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 Claremont
We work with several prefab and modular ADU manufacturers, including Dvele, Mighty Buildings, and Boxabl. If you’ve already researched a factory-built ADU, we can tell you honestly which product fits Claremont’s permit path and your lot conditions. Our parts and materials for these systems come through our Los Angeles supply network, so lead times stay predictable. See our brands for what we service.
Pricing for ADU Company in Claremont, CA
| Service | Typical range in Claremont |
|---|---|
| Detached ADU (500 – 750 sq ft) | $180,000 – $320,000 |
| Detached ADU (750 – 1,000 sq ft) | $240,000 – $380,000 |
| Garage conversion to ADU | $120,000 – $210,000 |
| Home addition (single room) | $60,000 – $110,000 |
| Home addition (primary suite) | $90,000 – $160,000 |
| Room addition (bedroom) | $50,000 – $95,000 |
| Room addition (bathroom) | $40,000 – $75,000 |
| Foundation repair (before ADU) | $8,000 – $25,000 |
| Permit fees and plan review | $5,000 – $14,000 |
| Site prep and utility trenching | $7,000 – $20,000 |
What pushes a Claremont project toward the top of those ranges is usually site work: slope correction, tree root removal, or upgrading an old electrical panel to handle the new load. Our written price covers what we can see during the site assessment, and we explain in plain terms what could change and why it would change before you sign anything.
Neighborhoods We Serve in Claremont
We work throughout Claremont, from the streets around the Claremont Colleges north of Foothill Boulevard to the quieter residential blocks south of Base Line Road. Most of our estimates reach you within a week of your first call, and we schedule site visits around your availability.
- Memorial Park area
- Village neighborhoods
- North Claremont (above Foothill)
- Towne Ranch
- South Claremont near the 210
Service Area – Cities Near Claremont
Beyond Claremont, our crews cover the surrounding foothill and valley communities. If you’re in Montclair, CA, La Verne, CA, Upland, CA, or Ontario, CA, the same Threshold Standard applies: written pricing, background-checked crew, and the 365-Day Done Right Promise on completed work.
Serving Claremont, CA - Our Local Coverage Area
We’re based in the Claremont 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 Claremont
After your site assessment and signed proposal, the city’s permit review for an ADU typically takes 8 to 16 weeks depending on the design review path. We schedule our crews based on permit approval dates, so a realistic start is 3 to 5 months from our first conversation. Call (472) 248-8213 for a timeline specific to your lot.
Most single-family homes in Claremont are not in HOAs, but if your property is in a planned development, the HOA may have its own design rules on top of the city’s. We review both sets of requirements during our site assessment and flag anything that could delay your permit. State law limits HOA restrictions on ADUs, but the process still runs through city review first.
Yes. Every technician and crew member on a Sutton project is background-checked and identity-verified under the Threshold Standard, and their name and photo are sent to you before they arrive. They come in marked uniforms and show a photo ID badge at the door. That’s true for the first site visit and every day of the build.
If you’re weighing an ADU, addition, or room conversion in Claremont, call (472) 248-8213 for a free estimate. We’ll send someone to your property, give you a written price, and tell you exactly who’s walking onto your lot before they ever ring the bell.
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 Claremont Customers Say
"Insulated the walls and ceiling properly. It stays comfortable even in July."
- Tamika W."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.
