A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Pomona, CA
Building an ADU in Pomona, CA means adding a second home to a lot that was platted generations ago – often in the historic districts along Garey Avenue or in the mid-century tracts near Holt Avenue. Most Pomona homeowners come to us asking the same question: what will this cost, and who exactly is going to show up? The answer to the first is a written price before any work begins. The answer to the second is a name, a photo, and a background-checked professional at your door. If you’re considering a detached ADU, garage conversion, or room addition in Pomona, call (472) 248-8213 for a free estimate.
Why Pomona Homes Are Different
Pomona’s housing stock spans more than a century. You’ll find Craftsman bungalows near Lincoln Park, post-war stucco homes in Westmont, and 1960s ranch-style builds along the Phillips Ranch foothills. That range matters when you’re adding square footage. A detached ADU behind a 1920s bungalow has different foundation and setback realities than a garage conversion on a 1970s flat lot. The San Jose Hills to the south and the San Gabriel Mountains to the north also mean some Pomona parcels carry slope and drainage considerations that flat-land cities never deal with.
Then there’s permit reality. The city of Pomona processes ADU and addition applications through its planning division, and while California state law has streamlined ADU approvals, local review times and specific interpretations still vary. We’ve handled enough Pomona projects to know when a plan check will ask for additional drainage details or a structural letter. That local knowledge shows up in your timeline, not just your budget. Pomona’s warm, dry summers also mean exterior work moves quickly from June through October, but the same sun that helps stucco cure fast also punishes materials that aren’t specified for high UV exposure.
Our Main Pomona Services
These are the three services Pomona homeowners call about most. Each has its own page with full pricing, timelines, and local project walkthroughs.
Home Addition Contractor in Pomona
A home addition in Pomona can mean pushing out a kitchen on a Westmont lot, adding a primary suite in Phillips Ranch, or expanding a family room off a 1950s bungalow near Garfield Park. Older Pomona homes often have undersized electrical panels and original foundations that need evaluation before framing begins – we quote for what actually needs doing, not just what looks good on paper. The written price covers structural work, electrical, plumbing, roof tie-ins, and finish work. Home Addition Contractor in Pomona has the full scope and local pricing.
ADU Builders in Pomona
Pomona’s R1 and R2 zoning districts offer a real opportunity for detached ADUs and garage conversions. On a typical 6,000 square foot Pomona lot, a 400 to 800 square foot detached ADU usually fits within rear-yard setback rules, but the positioning depends on existing structures, utility lines, and access for construction. We handle the site survey, the plans, the permit package, and the build. ADU Builders in Pomona covers detached units, garage conversions, and prefab brand options in detail.
Room Addition Contractor in Pomona
A room addition is usually the smallest and fastest way to add livable space in Pomona – think a single bedroom, a home office, or a den extension. The work typically runs four to eight weeks depending on scope, and on Pomona’s older lots we often coordinate foundation tie-ins, roof transitions, and stucco matching so the new work blends with the original house. Room Addition Contractor in Pomona explains what’s included and what Pomona homeowners typically pay.
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 Pomona
If you bring us a prefab ADU from Abodu, Cover, Dvele, or Mighty Buildings, we handle the site work, foundation, utility connections, and finish assembly. We’re familiar with each brand’s installation requirements, so site prep and permit coordination happen without back-and-forth delays. Our brands page explains which product lines fit Pomona lot sizes and budgets.
Pricing for ADU Company in Pomona, CA
| Service | Typical range in Pomona |
|---|---|
| Detached ADU (400 – 600 sq ft) | $180,000 – $280,000 |
| Detached ADU (600 – 800 sq ft) | $220,000 – $320,000 |
| Garage conversion ADU (400 – 600 sq ft) | $95,000 – $145,000 |
| Room addition (200 – 400 sq ft) | $65,000 – $110,000 |
| Room addition (400 – 600 sq ft) | $95,000 – $150,000 |
| Site prep, utilities, and foundation (ADU) | $35,000 – $75,000 |
| Prefab ADU delivery and assembly (excludes structure) | $28,000 – $52,000 |
| James Hardie exterior cladding (per 100 sq ft) | $1,100 – $1,600 |
What pushes the price up in Pomona: slope and retaining work in the Phillips Ranch foothills, outdated electrical panels on pre-1960 homes, and soil conditions that require deeper footings. Whatever the final number is, you’ll see it in writing before we start – no change orders slipped into the bill.
Neighborhoods We Serve in Pomona
We cover all of Pomona, but these neighborhoods come up most often when homeowners request ADU or addition estimates. Response and scheduling vary slightly by area, though most Pomona property visits happen within a few business days of your call.
- Phillips Ranch
- Westmont
- Lincoln Park
- Garfield Park
- Ganesha Hills
Service Area – Cities Near Pomona
Beyond Pomona itself, we run crews into the surrounding foothill and valley communities. If you’re just over the city line, reach out and we’ll confirm coverage for your street. Nearby areas we serve include Diamond Bar, CA, Montclair, CA, Chino Hills, CA, and Claremont, CA.
Serving Pomona, CA - Our Local Coverage Area
We’re based in the Pomona 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 Pomona
Yes. We prepare and submit the full permit package to the city of Pomona, respond to plan check comments, and coordinate inspections through final sign-off. You won’t be asked to chase paperwork or interpret code notes on your own. Call (472) 248-8213 and we’ll explain what your specific project triggers in Pomona’s review process.
Some Pomona neighborhoods – especially in Phillips Ranch and newer subdivisions – have HOAs with architectural review requirements. California law limits HOA authority over ADUs, but design standards can still apply to additions. We’ll check your specific association early so the timeline reflects reality, not optimism.
For a garage conversion, plan for roughly six to nine months including design, permits, and construction. A detached ADU generally runs nine to fourteen months. A smaller room addition can finish in four to six months. Your written estimate includes a schedule so you know what to expect before you commit.
If you want a real price for your Pomona project – in writing, before any work begins – call (472) 248-8213 to schedule a free estimate. Miles Hartwell and the Sutton ADU Builders team will walk your lot, answer straight, and show you exactly who’s coming to your door.
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 Pomona Customers Say
"Backyard ADU for my mother. The project manager showed ID and walked me through the permit steps, the foundation plan, and the schedule. Moved her in on time."
- Margaret C."Insulated the walls and ceiling properly. It stays comfortable even in July."
- Tamika W."They handled the drawings and the permit paperwork for us. All I had to do was pick the finishes."
- Rosa M.
