A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in San Dimas, CA
Fielding ADU Builders handles accessory dwelling units, garage conversions, and room additions in San Dimas, CA. Most of the homes here sit on larger lots than you find closer to Los Angeles, which usually means more room to place an ADU without fighting the property line. The city’s hillside terrain and older housing stock can complicate grading and foundation work, so a written price before any work starts matters more than usual. Call (361) 315-4177 for a free estimate on your San Dimas project.
Why San Dimas Homes Are Different
San Dimas homes tend to fall into two groups: mid-century ranch houses on flat streets near San Dimas Avenue, and newer hillside properties where the lot slopes toward the San Gabriel foothills. The older stock often has detached garages that convert cleanly, but the concrete slabs underneath were poured decades ago and sometimes lack the reinforcement current code expects. Hillside lots bring their own complications: retaining walls, drainage, and sometimes a setback variance (the city’s written permission to build closer to the property line than the standard rule allows). The city reviews ADU applications through its planning division, and accessory structures must meet California’s statewide ADU standards, which override some local restrictions. We plan every San Dimas job around the specific lot, not a generic template.
Our Main San Dimas Services
Most San Dimas homeowners call us about one of three things: adding a room to the existing house, converting a garage into living space, or building a detached ADU in the backyard. Each has its own page here with local specifics.
Room Addition Contractor in San Dimas
Room additions in San Dimas usually mean expanding a ranch house outward, which involves matching roof lines, tying into the existing foundation, and sometimes addressing the way older homes settled over time. Hillside lots may require pier-and-beam work instead of a simple slab. We write the price before any work starts and pull every permit the city requires. Room Addition Contractor in San Dimas.
Garage Conversion Contractor in San Dimas
Detached garages are common in San Dimas, and many homeowners convert them into rental units or in-law suites. The existing slab, electrical service, and sewer line location drive most of the cost. City code requires that converted garages meet the same habitability standards as the main house, including insulation, egress, and ventilation. Garage Conversion Contractor in San Dimas.
ADU Builders in San Dimas
A detached ADU in a San Dimas backyard gives you options: a rental unit, a home office, or a place for family. We work with prefab platforms like Abodu and Cover when the lot and access favor it, and with conventional framing when the site calls for it. Every ADU we build in San Dimas comes with a written one-year workmanship guarantee. ADU Builders in San Dimas.
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 Dimas
We specify and install prefab systems from Abodu, Cover, and Dvele for San Dimas projects where factory build quality and a shorter on-site schedule make sense. We also build conventionally with James Hardie siding. Our brands page lists what we work with and what each option costs.
Pricing for ADU Company in San Dimas, CA
| Service | Typical range in San Dimas |
|---|---|
| Garage conversion (attached, standard finish) | $60,000 – $105,000 |
| Garage conversion (detached, standard finish) | $78,000 – $138,000 |
| Detached ADU (prefab, 400 – 650 sq ft) | $160,000 – $245,000 |
| Detached ADU (conventional build, 400 – 650 sq ft) | $220,000 – $340,000 |
| ADU above detached garage | $240,000 – $360,000 |
| Room addition (master suite, 250 – 400 sq ft) | $110,000 – $210,000 |
| Room addition (second story, 500 – 800 sq ft) | $230,000 – $410,000 |
| Foundation upgrade for existing slab | $8,000 – $26,000 |
| Electrical service upgrade to 200A | $3,200 – $6,800 |
| Site prep and grading (flat lot) | $4,000 – $12,000 |
| Site prep and grading (hillside lot) | $14,000 – $42,000 |
Hillside lots in San Dimas push grading and retaining costs higher, which is why the flat-lot and hillside figures above are separated. Our price goes in writing before any work starts, and that number does not move unless you change the scope yourself.
Neighborhoods We Serve in San Dimas
We work across San Dimas, from the flat streets near the downtown corridor to the hillside subdivisions off Foothill Boulevard. Typical scheduling for a first site visit runs two to five business days depending on the season.
- Downtown San Dimas near Bonita Avenue and San Dimas Avenue
- Neighborhoods east of Lone Hill Avenue
- Hillside streets south of Foothill Boulevard
- Areas near Via Verde and San Dimas Canyon Road
- Streets west of Eucla Avenue toward Glendora
Service Area – Cities Near San Dimas
While this page covers San Dimas, our crews also serve the surrounding foothill communities. If you live a few minutes away, see our pages for La Verne, CA, Glendora, CA, Covina, CA, or Azusa, CA. Each page covers local conditions and pricing for that city.
Serving San Dimas, CA - Our Local Coverage Area
We’re based in the San Dimas 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 Dimas
Yes. California state law requires San Dimas to permit ADUs on any lot zoned for single-family or multi-family residential use, subject to the state’s size and setback standards. Some hillside lots may need a variance for slope or access, which we handle as part of the permit package we submit.
San Dimas reviews ADU applications under the state’s 60-day statutory timeline, but plan check comments and corrections usually extend the real-world total to three to five months for conventional builds. Prefab systems from Abodu or Cover sometimes move faster because the plans are already approved at the state level. Call (361) 315-4177 and we’ll give you an honest schedule for your specific lot.
We handle the entire job: plans, permits, grading, foundation, construction, and finish work. The only outside parties are the city inspectors and any utility company that needs to upgrade service. One written price covers the whole scope before we start.
Contact Fielding ADU Builders in San Dimas
If you’re planning an ADU, garage conversion, or room addition in San Dimas, call (361) 315-4177 for a free estimate. We’ll put the price in writing, walk you through the permit path for your specific lot, and schedule a site visit at a time that works for you. A live person always answers.
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 Dimas Customers Say
"Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Foundation and slab poured on schedule. Crew kept the yard orderly."
- Marian J."Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B.
