A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Brea, CA
We build ADUs, garage conversions, and room additions in Brea, and what sets this city apart is the housing stock itself. Most homes here went up between the 1950s and 1970s: ranch-style layouts, modest lots, and not a lot of extra yard to work with. That shapes every project we take on. Brea’s warm, dry summers also mean ventilation and cooling can’t be an afterthought, especially in a converted garage. If you’re weighing an ADU or addition, call (559) 238-9583 for a free estimate and a written price.
Why Brea Homes Are Different
Brea’s residential neighborhoods are largely mid-century single-family homes, and that changes how ADUs and additions get planned. Lots tend to be narrower, with limited rear or side yard space, so a detached unit often won’t fit the way it would in a newer master-planned development. Many Brea ADUs end up as garage conversions or compact attached units that tie into the existing roofline. The R-1 and R-2 single-family zones also carry minimum lot size requirements that can restrict where a detached ADU can sit, and the city’s design standards for attached ADUs require architectural compatibility with the primary house. In practice, that means the ADU has to look like it belongs, not like a box dropped in the backyard.
The Blackstone master-planned community is a useful example. Lots there are small, so attached ADUs are common, integrated into the main structure and matched to the exterior. The result is what homeowners often call a stealth granny flat: extra living space that keeps the street’s uniform appearance intact. We plan for that from the first site visit.
Our Main Brea Services
Most Brea homeowners reach us about one of three projects, and each has its own dedicated page with local specifics, pricing, and permitting notes.
Room Addition Contractor in Brea
A room addition in Brea means working with an existing ranch or mid-century footprint, often extending outward into a side yard or building up. We handle the structural work, the tie-in to the existing roofline, and the finishes so the new space reads as original to the house. Brea’s warm climate makes insulation and window placement a bigger deal here than in cooler coastal cities, and we spec that accordingly. Reed Calloway oversees each estimate personally. See Room Addition Contractor in Brea for full details.
Garage Conversion Contractor in Brea
Garage conversions are the most common ADU route in Brea because the structure already exists, which keeps cost and timeline down and avoids the lot-size issues that come with detached builds. The catch is HVAC: most Brea garages were never conditioned, so we plan ventilation and cooling from the start, not as a change order later. The conversion also has to meet the city’s design standards for attached units, which we handle through the permit process. See Garage Conversion Contractor in Brea for pricing and process.
ADU Builders in Brea
Detached and attached ADUs in Brea follow the city’s zoning rules for lot size and setbacks, and we pull permits by the book on every build. For tight lots, we work with prefab platforms like Abodu and Cover, which shorten on-site time and simplify the approval path. For a custom unit, we build conventionally with materials like James Hardie siding. Either way, the price goes in writing before we start. See ADU Builders in Brea for full detail.
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 Brea
We work with the ADU and prefab platforms Brea homeowners already research, including Abodu, Cover, and Dvele, alongside conventional materials like James Hardie siding. Parts and finish materials are ordered through our regional suppliers, which keeps turnaround predictable. See our brands for the full list.
Pricing for ADU Company in Brea, CA
| Service | Typical range in Brea |
|---|---|
| Garage conversion ADU | $95,000 – $145,000 before permit fees |
| Detached backyard ADU (prefab) | $140,000 – $220,000 before permit fees |
| Detached backyard ADU (conventional) | $210,000 – $320,000 before permit fees |
| Attached ADU addition | $120,000 – $190,000 before permit fees |
| Primary bedroom suite addition | $85,000 – $140,000 before permit fees |
| Family room addition | $70,000 – $120,000 before permit fees |
| Second-story addition | $180,000 – $260,000 before permit fees |
| Kitchen extension | $65,000 – $110,000 before permit fees |
Brea prices push upward when the lot is tight and the city requires a setback variance, which adds design and review time. The price we give you in writing before work starts is the price on the final invoice, no change orders at the door.
Neighborhoods We Serve in Brea
We work across Brea’s residential neighborhoods, from the older ranch-home streets near downtown to the newer planned communities. A typical site visit gets scheduled within the week, and the written estimate follows shortly after.
- Blackstone
- Olinda Ranch
- Craig Park area
- Tonner Hills
- Downtown Brea
Service Area – Cities Near Brea
We serve Brea and the surrounding communities, including Rowland Heights, CA, Walnut, CA, Hacienda Heights, CA, and Diamond Bar, CA. Dispatch and scheduling are coordinated from our Los Angeles office; crews serve Brea locally.
Serving Brea, CA - Our Local Coverage Area
We’re based in the Brea 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 Brea
Scheduling starts within about a week for the estimate, and the written price follows that visit. Permitting in Brea adds its own timeline, which depends on whether the project needs a variance or design review. Call (559) 238-9583 to get a start date specific to your lot.
Yes. We pull permits by the book for every ADU, conversion, and addition in Brea, including setback variances when the city requires them. The permit work is part of the written scope, not an extra line item that appears later.
We cover all Brea neighborhoods, from Blackstone to the Craig Park area and the older streets near downtown. If you’re just outside the city line, call (559) 238-9583 and we’ll confirm coverage for your address.
To schedule a free estimate in Brea, call (559) 238-9583. Reed Calloway or a member of the Fielding team will walk your lot, talk through the options, and put the price in writing.
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 Brea Customers Say
"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."Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B.
