A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Commerce, CA
Fielding ADU Builders handles ADUs, garage conversions, and room additions in Commerce, CA, with a written price handed to you before any work begins and a one-year written guarantee on every project. In Commerce, the work usually means attached garage conversions and second-story additions on modest 1940s-to-1960s homes, not sprawling backyard cottages. The lots are small, the setbacks are tight, and the city’s mixed residential and industrial zoning shapes how every job is permitted. Call (213) 732-1415 to schedule a free estimate.
Why Commerce Homes Are Different
Commerce’s housing stock is predominantly single-family wood-frame stucco homes built between the 1940s and 1960s, many on lots under 5,500 square feet. Rear yards tend to be narrow, which makes attached garage conversions and second-story additions more practical than detached ADUs on most properties. The city’s industrial base sits right alongside residential blocks, and that unusual mix shows up in the work itself: some lots can access commercial-grade utility connections, which sometimes speeds up electrical permitting and panel work.
The climate matters too. Summer temperatures in Commerce regularly exceed 90°F, so an ADU or converted garage without proper insulation, air conditioning, and ventilation will be uncomfortable half the year. The area sits on the LA Basin’s alluvial plain, and in parts of Commerce the water table is high enough that slab foundations and drainage need to be designed carefully. A cheap foundation pour here can become a moisture problem within a few years. Older homes also frequently need electrical panel upgrades before an ADU or addition can pass inspection. We factor all of that into the written price before we start.
Our Main Commerce Services
Commerce homeowners call us most often about three jobs, each with its own dedicated page covering local conditions, pricing, and what to expect.
Room Addition Contractor in Commerce
Most room additions in Commerce are second-story additions or bump-outs that extend the existing footprint without eating into a rear yard that is already tight. These older wood-frame homes usually need structural evaluation first, and many need foundation reinforcement or electrical panel upgrades before the new square footage is viable. The city’s setback rules are specific to Commerce’s compact, semi-urban character, so we handle the variance paperwork when required. Room Addition Contractor in Commerce covers the full scope, local pricing, and the permit process.
Garage Conversion Contractor in Commerce
Commerce has a large number of homes with long, narrow driveways leading to detached garages at the rear of the lot. Those structures are prime ADU conversion candidates, but they were rarely built to living-space standards. Electrical, insulation, slab moisture barriers, and seismic anchoring are typically all in play. Attached garage conversions, common on the smaller lots, are often simpler and less expensive. Garage Conversion Contractor in Commerce breaks down cost ranges and what a conversion on a typical Commerce lot involves.
ADU Builders in Commerce
Commerce is one of the more ADU-friendly cities in Southeast LA, with a streamlined permitting approach shaped by the city’s industrial tax base and its need for workforce housing. That does not mean the work is simple. Height limits, parking waivers near transit, and specific setbacks all reflect the city’s compact character. We build both conventional ADUs and prefab or modular units from brands like Cover and Boxabl, matched to the lot and the budget. ADU Builders in Commerce has the full breakdown.
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 Commerce
We install and finish prefab and modular ADU platforms including Cover, Dvele, and Boxabl, along with conventional builds using James Hardie siding. We match the platform to the lot and the budget, and we service what we build. See our brands for the full list.
Pricing for ADU Company in Commerce, CA
| Service | Typical range in Commerce |
|---|---|
| Detached ADU (prefab, 300 – 500 sq ft) | $120,000 – $180,000 |
| Detached ADU (conventional build) | $180,000 – $280,000 |
| Attached garage conversion ADU | $90,000 – $150,000 |
| Detached garage conversion ADU | $110,000 – $170,000 |
| Second-story room addition | $200 – $350 per sq ft |
| Ground-floor room addition | $150 – $250 per sq ft |
| Electrical panel upgrade to 200A | $2,500 – $4,500 |
| Foundation retrofit/reinforcement | $8,000 – $25,000 |
| Driveway pour (standard, replacement) | $6,000 – $12,000 |
| Full interior finish for prefab ADU shell | $40,000 – $80,000 |
Prices in Commerce trend toward the middle of these ranges, but a high water table that requires extra drainage work or an older panel that needs replacement will push the number up. The price we hand you in writing before work starts is the price on the final invoice. No change orders unless you ask for something new.
Neighborhoods We Serve in Commerce
We work across Commerce and the immediately adjacent streets of East Los Angeles, Bell Gardens, and Montebello that share Commerce’s lot sizes and housing stock. Typical response time for an estimate visit anywhere in Commerce is one to two business days.
- Bandini
- Bristow Park
- Rosewood Park
- Commerce Casino district and surrounding residential streets
- Telegraph Road corridor
Service Area – Cities Near Commerce
We also serve neighboring cities and the broader LA metro, including Los Angeles, CA, West Hollywood, CA, Beverly Hills, CA, and Gardena, CA. Scheduling and dispatch are coordinated from our Los Angeles office, and crews work locally in Commerce.
Serving Commerce, CA - Our Local Coverage Area
We’re based in the Commerce 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 Commerce
In practice, most Commerce ADU permits come back in 30 to 90 days, depending on whether the lot needs a setback variance or a parking waiver near transit. Commerce’s permitting approach is faster than most of Southeast LA because the city processes ADU applications with an eye toward workforce housing. Call (213) 732-1415 for an estimate and we can give you a realistic timeline for your specific lot.
Yes. Every project we do in Commerce is permitted, inspected, and closed out by the book. We pull the permits, schedule the inspections, and stand behind the finished work for a full year in writing. That is what the Garrison Standard means: show up in the window, price in writing, by the book, leave it clean, stand behind it for a year.
We can give you a realistic range over the phone based on the project type and what we know about Commerce’s lot sizes and housing stock. The firm number comes after a site visit, and it goes in writing before any work starts. Call (213) 732-1415 and a live person will answer.
For a free estimate on an ADU, garage conversion, or room addition in Commerce, call (213) 732-1415. A live person answers, day or night.
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 Commerce Customers Say
"Clear price breakdown. Change orders were all in writing."
- Hal P."Built a detached ADU behind our house. The builder is a veteran and runs the site like a platoon: schedule posted, crew on time, everything labeled. Finished within a few days of the date."
- Ken W."Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G.
