A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Richmond, CA
Adding an ADU in Richmond, CA is one of the smartest ways to add living space to a property you already own. An ADU (accessory dwelling unit) is a second, fully independent home on the same lot as your main house, and in Richmond it’s often a garage conversion or a detached unit in the backyard. Richmond’s housing stock, its large older lots, and its industrial past mean the work here looks different than it does in San Francisco or Marin. We plan for soil surprises, aging electrical panels, and the salt air that rolls off the bay. Call (707) 760-0502 for a free estimate on your Richmond ADU.
Why Richmond Homes Are Different
Most of Richmond’s single-family homes were built between the 1920s and the 1960s. That matters when you’re planning an ADU. Many of these houses are wood-frame or stucco with detached garages at the back of a long, deep lot. The lot shape often makes a garage conversion the most cost-effective ADU path in Richmond, especially in the flatlands where driveways are narrow and the garage sits behind the house rather than beside it. It also means the existing foundation, the electrical panel, and sometimes the garage siding all need attention before a crew starts framing.
There’s another Richmond-specific factor: soil. Parts of the city sit on land with a long industrial history tied to the refineries and the rail yards. Some rear yards have fill soil that shifts, drains poorly, or needs compaction before a slab can be poured for a detached ADU. We see this most often in the flatlands and near the older industrial corridors. The good news is the climate works in your favor. Richmond’s mild, Mediterranean weather means an ADU rarely needs heavy HVAC. The real work is insulation and moisture control, because the bay fog and salt air can corrode exposed metal fasteners and siding over time. We spec corrosion-resistant hardware and proper ventilation on every Richmond project.
Our Main Richmond Services
Most Richmond homeowners come to us for one of three things: a home addition, a garage conversion, or a full ADU build in the backyard. Each has its own page with detailed pricing, timelines, and Richmond-specific guidance.
Home Addition Contractor in Richmond
A home addition in Richmond usually means extending a kitchen, adding a bedroom, or building out a new primary suite on a house from the 1930s or 1940s. The older the home, the more likely the foundation and electrical service need upgrades before the new square footage is framed. In Richmond’s flatlands, additions often run into the same narrow-lot constraints that make garage conversions popular, so we work through setback and access issues early. Russ Delmar oversees each addition from first measurement to final inspection. Learn more on our Home Addition Contractor in Richmond page.
Garage Conversion Contractor in Richmond
Garage conversions are the workhorse of Richmond’s ADU market. The detached garage at the rear of so many Richmond lots is already framed, roofed, and set back from the house, which makes it a natural candidate for conversion into a studio or one-bedroom unit. Before any work begins, we check for asbestos in older garage siding, which is common in Richmond garages built before the 1980s. We also look at the slab, the roofline, and the alley or driveway access that will serve the new unit. Details are on the Garage Conversion Contractor in Richmond page.
ADU Builders in Richmond
For a detached backyard ADU in Richmond, the big decisions are unit type, foundation, and utility runs. Many Richmond lots are deep enough to fit a 400 to 800 square foot detached unit behind the main house. Soil conditions in some Richmond backyards mean we sometimes recommend extra compaction or a raised foundation system. We’ve worked with Boxabl, Plant Prefab, and Tuff Shed units and can match the right build method to your lot and budget. See the full breakdown on our ADU Builders in Richmond page.
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 Richmond
We service Richmond ADUs built with Boxabl, Plant Prefab, and Tuff Shed systems, along with James Hardie siding. When you call about a Richmond unit, we know these systems well enough to diagnose problems quickly and order the right parts the first time. See our brands for the full list.
Pricing for ADU Company in Richmond, CA
| Service | Typical range in Richmond |
|---|---|
| Detached backyard ADU (400 – 800 sq ft) | $180,000 – $360,000 |
| Garage conversion ADU (300 – 600 sq ft) | $120,000 – $220,000 |
| JADU (junior ADU inside existing home) | $80,000 – $140,000 |
| Prefab ADU (Boxabl, Plant Prefab, or similar) | $150,000 – $280,000 |
| Home addition (200 – 500 sq ft) | $130,000 – $250,000 |
| Foundation upgrade or seismic retrofit | $15,000 – $45,000 |
| Electrical panel upgrade (100A to 200A) | $3,500 – $7,500 |
| Asbestos abatement (garage siding or ceiling) | $2,000 – $8,000 |
| Soil compaction or drainage correction | $5,000 – $20,000 |
| Permit drawings and city fees | $8,000 – $20,000 |
Richmond prices tend to climb when we have to remediate soil, upgrade a 1950s-era electrical panel, or remove asbestos from garage siding before framing starts. Those are the three costs most homeowners don’t see coming. We give you a written price before any work begins, and that price doesn’t change at the door.
Neighborhoods We Serve in Richmond
We work throughout Richmond, from the flatlands to the hills. Most of our Richmond projects are in neighborhoods with older single-family lots, but we also handle newer builds and infill lots.
- Point Richmond
- Marina Bay
- Richmond Annex
- North and East
- Iron Triangle
Our Richmond crews typically reach most neighborhoods within 30 minutes when a site visit is scheduled in advance.
Service Area – Cities Near Richmond
Beyond Richmond, we serve nearby Bay Area communities including Corte Madera, CA, San Rafael, CA, Emeryville, CA, and Sausalito, CA. Each city has its own housing stock and lot patterns, so we handle them on separate pages.
Serving Richmond, CA - Our Local Coverage Area
We’re based in the Richmond 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 Richmond
Most Richmond ADU projects start with a site visit within two weeks of your call, followed by a written estimate. Permitting in Richmond typically takes longer than the build itself, so we encourage homeowners to call before they’re fully decided on scope. Call (707) 760-0502 to schedule your free estimate.
Yes. Any legal ADU in Richmond, whether it’s a garage conversion or a detached unit, requires city permits and inspections. We handle the permit drawings and submittal as part of the project.
We serve all of Richmond, including Point Richmond, Marina Bay, the flatlands, and the hills. Our scheduling is coordinated from the brand’s San Francisco Bay Area office, and our crews are based locally in Richmond. Call (707) 760-0502 with your address and we’ll confirm availability.
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 Richmond Customers Say
"The ADU came out beautiful and the permitting, which terrified me, was handled start to finish. They kept me updated every week so I was never wondering what was happening."
- Shauna Mills"Turned our detached garage into a little guest house. Clean crew, respectful of the neighbors, and no mystery charges at the end. Love how it turned out."
- Carmela Fontes"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt
