A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Garage Conversion Contractor Across Commerce
If you own a home in Commerce with a garage that mostly stores boxes and a car that hasn’t fit in years, a garage conversion is the most practical way to add real living space without moving. In Commerce’s 90040 flatlands, that work carries a specific set of steps most homeowners don’t see coming: floodplain development review, slab moisture testing, and elevation paperwork that cities on higher ground never ask for. Fielding ADU Builders walks you through every one of them, with the full price in writing before we touch a wall. Call (361) 315-4177 to schedule your free estimate.
Why Fielding ADU Builders Is Commerce’s Preferred Garage Conversion Contractor Company
Commerce homeowners call us because we do not flinch at the parts of the job that make other contractors stop returning calls. The floodplain review, the plan-check corrections, the elevation certificate, the inspector who wants to see the slab vapor barrier before drywall goes up: that is the work, not an obstacle. Our Garage Conversion Contractor team has converted garages on Slauson Avenue, up and down Eastern Avenue, and in the neighborhoods around Commerce City Hall, and we speak the city’s permitting language.
Every project gets a written price before any work starts. That is not a negotiation tactic; it is how we operate. The number you approve on day one is the number on the final invoice. If something fails inside the first year, the Garrison Standard guarantee means we come back and correct it at no charge. Reed Calloway, who leads Fielding ADU Builders, insists on this because a contractor who will not put his word in writing is a contractor you cannot hold to anything.
Garage Conversion Permit in Commerce
Garage Conversion Permit in Commerce means more than the standard building permit a bedroom remodel pulls in most of Los Angeles County. Because much of Commerce sits in a mapped FEMA floodplain, the city requires floodplain development review and often an elevation certificate before plan check moves forward. That can add months if you do not expect it.
Floodplain Development Review
The city wants to know that converting a garage to living space will not put sleeping quarters below the base flood elevation without proper protection. For most 1950s and 1960s slab-on-grade garages here, that means a surveyor or engineer certifies the finished floor height and the plans show how flood openings or dry floodproofing will work. This is not a step you can skip or file after the fact.
Plan Check and Inspections
Once floodplain review clears, the building plan check covers structural changes, egress, electrical, and HVAC. Commerce inspectors will want to see the slab moisture barrier, the new egress window or door cut into a side wall, and the separation of any new kitchenette or bath from the existing house systems. Budget for plan-check corrections and at least one inspection re-visit; they are normal here, not a sign the job is off track.
Garage Conversion to Living Space in Commerce
Garage Conversion to Living Space in Commerce is not just framing and drywall. The city’s legacy 1950s and 1960s slab-on-grade garages sit directly on grade, and many were built before vapor barriers were standard. Before you can make that floor a bedroom or living room, the slab has to pass moisture testing or get a new vapor barrier and flooring system installed.
Slab Condition and Moisture
On a 1959 slab-on-grade garage off Slauson Avenue near Commerce City Hall, our crew converted a two-car garage to a studio ADU for a client’s aging parents. We met the city’s floodplain development requirements, verified the existing slab had a functioning vapor barrier, cut a new egress window into the side yard, and tied the unit into existing electrical and HVAC runs rather than run all-new systems. After inspection sign-off and a new certificate of occupancy, the parents moved in with a private entrance and kitchenette while the main house kept the full driveway and a new Tuff Shed storage unit out back.
Egress and Light
Living space needs a way out in an emergency and natural light in the daytime. That usually means cutting a new window or door into a side or rear wall, which requires structural work on a load-bearing garage wall. The trade-off is a brighter, safer room and a finished space that appraises as square footage rather than storage.
Trusted Brands We Service in Commerce
We work with the prefab and modular platforms Commerce homeowners are already researching: Cover, Dvele, and Mighty Buildings. Each one suits a different lot and budget, and we know which works with the floodplain requirements and slab conditions we see in the 90040 flatlands. For conventional builds, we use James Hardie siding and Tuff Shed-style structures where they fit the job. We keep local material sources in Commerce so lead times stay short and your project does not stall waiting on a panel delivery from out of state.
Common Garage Conversion Contractor Problems We See in Commerce Homes
- Floodplain review stalling plan check. Homeowners assume a garage conversion is a simple interior remodel. In Commerce, the floodplain development permit and elevation certificate come first, and skipping them adds months to the timeline.
- Slab moisture not budgeted. A 1950s garage slab with no vapor barrier will fail a moisture test. Remediation means a new barrier, possibly a raised floor assembly, and flooring rated for slab contact.
- Bids that are not apples-to-apples. Some contractors omit floodplain permit fees, plan-check corrections, and inspection re-visits from their numbers. A lower bid that leaves those out is not lower; it is incomplete.
- Utility connections done wrong. Tying a new ADU into existing electrical and HVAC is cheaper than running all-new systems, but only if the existing service has the capacity. We check that before we quote, not after we open the wall.
Pricing for Garage Conversion Contractor in Commerce, CA
A typical attached garage conversion to living space in Commerce runs $80,000 to $140,000 before permit fees, depending on square footage and whether you need a kitchenette or bath. A basic garage-to-bedroom conversion without plumbing starts closer to $60,000 to $85,000. Detached garage ADUs with a full kitchen and bath run $150,000 to $220,000, with prefab options from Cover or Dvele landing in the middle of that range. Floodplain development review, elevation certificates, and slab moisture mitigation add $5,000 to $12,000 in Commerce specifically. Call (361) 315-4177 for an exact written quote; estimates are free and the price we give you is the price you pay.
We Also Serve Cities Near Commerce
Our Commerce crews regularly work in Los Angeles, Long Beach, Anaheim, and Riverside. Each city has its own permit quirks, and we handle them the same way: written price first, permitted work, and a one-year written guarantee on every job.
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 Garage Conversion Contractor in Commerce
Yes. Because much of Commerce sits in a mapped FEMA floodplain, the city requires floodplain development review and typically an elevation certificate before the standard building plan check moves forward. Most neighboring hillside cities do not ask for either. Call (361) 315-4177 and we will walk you through the exact sequence for your property.
Sometimes. The existing slab is usable if it has a functioning vapor barrier and passes a moisture test; many 1950s slabs do not. If it fails, we install a new barrier and a raised floor assembly before finishes go in. Budget $5,000 to $12,000 for that work on a typical two-car garage in Commerce. For an exact assessment, call (361) 315-4177 to schedule a free site visit.
Plan for four to eight months total. Floodplain development review and elevation work take the first four to eight weeks, plan check runs four to six weeks, and construction runs eight to sixteen weeks depending on whether you tie into existing utilities or trench new ones. Inspection re-visits add a week or two at the end. Call (361) 315-4177 and we will give you a written schedule before you commit.
Three things: slab moisture remediation if the vapor barrier failed, utility trenching if the existing service cannot handle the new load, and plan-check corrections triggered during floodplain review. Our written price includes the floodplain and slab work we know Commerce requires, and if anything new comes up, we put the change in writing before proceeding. Call (361) 315-4177 for a fixed written quote.
They can often tie into the main house’s electrical and HVAC, which saves money over running all-new systems. The city will require separate metering only if the unit is rented separately long-term. We check the existing panel capacity before we quote so you are not surprised by a service upgrade later. Call (361) 315-4177 for a free review of your home’s current systems.
Get Your Commerce Garage Conversion Priced in Writing
The fastest way to know what your Commerce garage conversion will actually cost is to have us walk the property and put the number on paper. That estimate is free, it includes the floodplain work and slab testing this city requires, and it is the same number you will see on the final invoice. Call (361) 315-4177 to schedule yours.
Written by Reed Calloway, Owner at Fielding ADU Builders, serving Commerce with permitted garage conversions, ADUs, and room additions since 2006.
