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
Adding an ADU, a room addition, or a home addition in Commerce means navigating a built-out industrial-residential mix, older housing stock, and tight lot dimensions that make setbacks and utility routing genuinely complicated. Sutton ADU Builders handles the full scope here: detached ADUs, garage conversions, room additions, and larger home additions, all with a written price before work starts. If you’re weighing options for your Commerce property, call (472) 248-8213 for a direct conversation and a free estimate.
Why Commerce Homes Are Different
Commerce is a dense, flat, primarily industrial city in southeast Los Angeles County, and its residential neighborhoods sit in close quarters among warehouses, rail corridors, and the 5 and 710 freeways. Most single-family homes here were built between the 1940s and 1960s, which means foundations often need evaluation before any addition, and existing electrical panels frequently require upgrades to support a new ADU’s load. The flat terrain is helpful for slab-on-grade work, but the water table in parts of Commerce sits relatively high, so drainage and moisture management become real factors on ground-up builds. Setbacks (the required gap between your new structure and the property line) are tight on many Commerce lots, and the city’s planning department reviews each project against both state ADU rules and local zoning overlays. We see this in practice: a standard 10-foot rear setback often shrinks a buildable footprint dramatically on older 50-by-100 lots. The result is that Commerce projects reward early planning more than most, because a well-sited ADU here often depends on where the garage already sits and whether the lot has alley access.
Our Main Commerce Services
Commerce homeowners most often call us about two things: adding livable square footage to a home they already love, and building a detached ADU that generates rental income or houses family. Here is how each works here.
Home Addition Contractor in Commerce
A home addition in Commerce typically means expanding the kitchen, adding a primary suite, or extending a living area over an existing patio or side yard. Because many Commerce homes were built on raised foundations, we evaluate the existing stem wall and footings before designing the addition; some jobs require selective foundation work, which changes both timeline and cost. The city’s plan check process also looks closely at how the addition affects the original structure’s zoning compliance, especially on corner lots. Home Addition Contractor in Commerce
ADU Builders in Commerce
Detached ADUs are the most common build we handle in Commerce, usually placed in rear yards where a garage or storage shed already stands. Because lot coverage limits here are strict, the design phase often determines whether the ADU is a one-bedroom around 500 square feet or a two-bedroom closer to 750. We also handle garage conversions, which are particularly attractive on Commerce lots where the existing structure sits near the alley and can avoid new foundation work. ADU Builders in Commerce
Room Addition Contractor in Commerce
A room addition in Commerce is often the fastest way to add a bedroom, office, or family room without the permitting complexity of a detached structure. Because many Commerce homes share side yards that are narrower than current code prefers, we work closely with the city on variance requests and as-built drawings when the original property line sits tight against the addition. Room Addition Contractor 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 several prefab and modular ADU lines that fit Commerce lot conditions well, including Dvele, Cover, and Abodu. Parts and panels are ordered directly from each manufacturer and shipped to the Commerce job site, which typically keeps a prefab ADU on a shorter build timeline than a fully custom ground-up structure. You can read more about our brands.
Pricing for ADU Company in Commerce, CA
| Service | Typical range in Commerce |
|---|---|
| Detached ADU (500 – 750 sq ft, turnkey) | $180,000 – $320,000 |
| Garage conversion to ADU | $120,000 – $210,000 |
| Home addition (300 – 600 sq ft) | $90,000 – $195,000 |
| Room addition (single room, 150 – 250 sq ft) | $55,000 – $110,000 |
| Foundation work (new slab or raised foundation section) | $12,000 – $32,000 |
| Electrical panel upgrade (100A to 200A) | $3,500 – $7,500 |
| Site prep and grading (flat lot, minor) | $4,000 – $12,000 |
| Interior finish package (flooring, paint, trim) | $18,000 – $45,000 |
| Kitchen addition (within larger addition) | $40,000 – $85,000 |
| Bathroom addition (within larger addition) | $25,000 – $55,000 |
In Commerce, the two biggest price movers are foundation condition on older homes and the cost of panel upgrades where the electrical service enters from the alley or adjacent structure. Our written price is delivered before any work begins, and it stays fixed, with no change orders slipped in later.
Neighborhoods We Serve in Commerce
We work across the residential pockets of Commerce, including the areas near Rosewood Park, the streets north of Bandini Boulevard, the neighborhood around Veterans Memorial Park, and the residential blocks east of Garfield Avenue. Because our scheduling is coordinated from the Los Angeles office and crews serve Commerce locally, most estimates in the city can be scheduled within a week.
- Rosewood Park area
- North of Bandini Boulevard
- Veterans Memorial Park neighborhood
- East of Garfield Avenue
- Commerce Way corridor
Service Area – Cities Near Commerce
While this page is specific to Commerce, we also serve nearby cities across the region: Los Angeles, CA, Long Beach, CA, Anaheim, CA, and Riverside, CA. If you are just outside Commerce, call us and we will confirm coverage for your address.
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
Yes. We pull all required Commerce building permits, schedule inspections, and manage the plan check process for every ADU, home addition, and room addition. You receive a written price that includes permit fees as a line item, so there is no surprise charge when the city reviews your plans.
Most detached ADUs in Commerce take 6 to 10 months from design to final inspection, depending on plan check timing and whether foundation or panel work is required. Prefab models with simpler site conditions can finish sooner. Call (472) 248-8213 for an estimate based on your specific lot.
California state law allows ADUs on most single-family lots, but Commerce’s zoning overlays and setback rules can limit the buildable area. We evaluate your specific lot, existing structures, and alley access before you commit to a design, and the written price accounts for any variance work. Call (472) 248-8213 for a free estimate.
If you are considering an ADU, home addition, or room addition in Commerce, call Sutton ADU Builders at (472) 248-8213. You will get a written price before any work starts, and every person who comes to your property is background-checked, identity-verified, and photo-badged under the Threshold Verified standard.
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
"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."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R.
