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 accessory dwelling units, garage conversions, and room additions in Commerce, California, with a written price before any work starts and a one-year written guarantee on every job. Commerce presents a specific set of conditions for ADU work: older housing stock on compact lots, industrial zoning that butts up against residential blocks, and a city permitting process that moves on its own schedule. If you’re weighing an ADU or addition in Commerce, call (361) 315-4177 and we’ll walk you through what’s realistic on your lot.
Why Commerce Homes Are Different
Commerce is a small city, roughly 6.5 square miles, and the residential pockets sit close to major freight corridors, rail lines, and light industrial operations. That proximity shows up in the work: soil in parts of Commerce has been reworked over decades of grading and infill, which means foundation work needs a closer look before a garage conversion or backyard ADU gets designed. We’ve seen lots where the original footing was poured directly over old fill, and the fix changes the engineering plan before a single wall goes up.
The housing stock skews older, much of it built between the 1940s and 1960s. Those homes have framing that doesn’t always match modern shear-wall requirements, and the electrical panels are frequently undersized for an accessory dwelling unit. Commerce sits in an area where summers run hot, so insulation and window placement matter more than a homeowner might expect from a small addition. Setback and lot-coverage rules are tight on many of the narrower parcels, and the city will ask for specifics during plan review. All of it is manageable, but it’s why an ADU estimate for Commerce should be based on your lot and your house, not a square-footage average pulled from another city.
Our Main Commerce Services
Most Commerce homeowners who call us are weighing two or three paths to add living space, and each one has its own Commerce page with the full breakdown. Here’s the short version of what each involves locally.
Room Addition Contractor in Commerce
A room addition in Commerce usually means extending the back or side of a home on a lot that’s already close to its coverage limit. Older bungalows and ranch-style homes dominate the residential streets here, and tying new framing into 1950s construction is the part that separates a clean addition from one that develops cracks at the seam. We plan the tie-in, the foundation, and the roof line before we give you a written price. Room Addition Contractor in Commerce.
Garage Conversion Contractor in Commerce
Garage conversions are common in Commerce because many homes have detached garages that aren’t doing much beyond storage. The city’s rules around parking replacement and habitability standards apply, and we handle the permits, the insulation, the electrical upgrade, and the finish work. A detached garage conversion usually moves faster than a full addition because the shell already exists. Garage Conversion Contractor in Commerce.
ADU Builders in Commerce
A backyard ADU in Commerce works when the lot dimensions and setback rules line up. We build both prefab and stick-built ADUs, and we’re fluent with platforms like Cover, Dvele, and Mighty Buildings for homeowners who want the timeline and price predictability that prefab offers. Conventional builds with James Hardie siding are the other path, and we’ll tell you which one fits your lot and your budget. ADU Builders in Commerce.
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 work with leading prefab and modular ADU platforms including Cover, Dvele, and Mighty Buildings, plus conventional construction using James Hardie siding. That gives Commerce homeowners a real choice between factory-built precision and on-site framing. See our brands for the full list and what each platform does best.
Pricing for ADU Company in Commerce, CA
| Service | Typical range in Commerce |
|---|---|
| Detached ADU (prefab, turnkey) | $180,000 – $320,000 |
| Detached ADU (stick-built, turnkey) | $140,000 – $250,000 |
| Garage conversion ADU | $85,000 – $150,000 |
| Attached ADU (garage conversion or bump-out) | $90,000 – $170,000 |
| Room addition (ground-floor, 300 – 500 sq ft) | $65,000 – $120,000 |
| Junior ADU (attached, under 500 sq ft) | $70,000 – $110,000 |
| Foundation work (pier repair, underpin) | $4,000 – $18,000 |
| Electrical panel upgrade (100A to 200A) | $2,500 – $5,500 |
| HVAC for ADU (mini-split system) | $4,500 – $9,000 |
| Plumbing rough-in and tie-in | $3,000 – $12,000 |
| Insulation and drywall (per room) | $1,800 – $4,500 |
What pushes a Commerce price up is usually the same short list: older framing that needs seismic retrofitting, a panel that can’t carry the new load, or soil that needs a foundation upgrade. The number we hand you before work starts is the number on the final invoice, and we put it in writing every time.
Neighborhoods We Serve in Commerce
We work across Commerce, from the residential blocks near Bandini Boulevard up through the streets around Rosewood Park, Bristow Park, and the homes clustered near the Commerce Casino corridor. The city is compact enough that scheduling is straightforward, and we keep response times tight for estimates anywhere in Commerce.
- Bandini Boulevard area
- Rosewood Park vicinity
- Bristow Park neighborhood
- Commerce Casino corridor
- Telegraph Road residential blocks
Service Area – Cities Near Commerce
Beyond Commerce, our crews cover a service area that includes Los Angeles, CA, Long Beach, CA, Anaheim, CA, and Riverside, CA. Dispatch and scheduling are coordinated from our Los Angeles office, and the crews that serve Commerce live and work locally.
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
We can usually get an estimator to a Commerce address within a few business days. The city is small, which helps us schedule efficiently. Call (361) 315-4177 and we’ll set a time that works.
Yes. We pull the permits through the city of Commerce and manage the submittals, plan checks, and inspections. If an HOA is involved, we prepare the documentation they need. The paperwork is part of the written scope and price.
No, unless you change the scope. The price you approve in writing before we start is the price on the final invoice. If we find a hidden condition during demo, we show you what we found and agree on any adjustment before proceeding.
If you’re ready to get a real number for an ADU, garage conversion, or room addition in Commerce, call (361) 315-4177 and we’ll schedule your free estimate.
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
"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."Clear price breakdown. Change orders were all in writing."
- Hal P."Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G.
