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
Adding an ADU, garage conversion, or home addition in Pomona usually costs between $140,000 and $280,000 for a full detached unit, with garage conversions starting near $90,000. Pomona’s older housing stock and specific permit pathway make this city different from its neighbors: many lots qualify for parking waivers, but most pre-1960 homes need foundation and electrical upgrades before framing begins. If you’re weighing options in Pomona, call Seedling ADU Builders at (559) 258-5962 for a written, line-item price before any work starts.
Why Pomona Homes Are Different
Pomona’s housing stock is predominantly single-family homes built before 1960, with a meaningful share of Craftsman bungalows and Spanish Colonial Revival houses concentrated in neighborhoods like Lincoln Park and Wilton Heights. Those older homes bring real conditions into an ADU project: foundations that have settled, electrical panels that need a service upgrade, and plumbing that won’t support an added bathroom without re-piping. A thoughtful build starts with a structural assessment, not a pretty floor plan.
Pomona’s hot, dry summers shape the work, too. An ADU here needs insulation and HVAC sizing that can hold up to weeks of 95-degree afternoons, while the mild winters mean a simpler heating system is fine. Ventilation and window shading matter more than extra heating capacity. And Pomona’s streamlined ADU ordinance lets homeowners skip parking requirements when the property sits within a half-mile of transit, which makes accessory units unusually practical on the narrow, alley-loaded lots common in the city’s core.
There’s also the Pomona Heritage design guideline layer. Not mandatory, but strongly encouraged: ADU designs that echo the original home’s architectural character. In Lincoln Park and Wilton Heights especially, coordinating with the city’s historic preservation officer early can prevent a permit round-trip that costs weeks.
Our Main Pomona Services
Pomona homeowners most often call us about three projects: adding a detached ADU in the backyard, converting an existing garage into a rental or family unit, and building a bedroom or living-space addition onto the main house. Each one has its own Pomona page with pricing, timelines, and local permit notes.
Home Addition Contractor in Pomona
A home addition in Pomona usually means extending off the back or side of a pre-1960 house, which brings foundation tying and roofline matching into the conversation on day one. Older Pomona homes often have shallow footings, so an addition typically starts with a soils report and structural engineering before any walls go up. We keep the existing home livable during the work: shoe covers, drop cloths, and a clean-up photo before the crew leaves each day. See the full breakdown on our Home Addition Contractor in Pomona page.
Garage Conversion Contractor in Pomona
Pomona’s alley-loaded lots mean many garages sit at the back of the property, already separated from the house, which often makes a garage conversion the fastest path to a rental unit. The catch is that pre-1960 garages were rarely built to living-space standards, so expect insulation, a new slab or floor leveling, and an electrical service upgrade. Detached conversions on alley lots also unlock Pomona’s parking-waiver route when transit is nearby. Details and pricing are on our Garage Conversion Contractor in Pomona page.
ADU Builders in Pomona
Building a detached ADU in Pomona means designing around a narrow lot, an older main house, and a hot summer climate. We help families choose between site-built and prefab approaches, and we work hands-on with brands like Abodu, Cover, and Tuff Shed so the product fits the lot rather than the builder’s preference. Every Pomona ADU gets a written price before any work starts and carries the 365-Day Done Right Promise. Read the full scope on our ADU Builders in Pomona 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 Pomona
We work directly with Abodu, Cover, and Tuff Shed for prefab and modular ADU projects in Pomona, and we specify James Hardie siding where the Pomona Heritage guidelines call for a period-appropriate exterior. See our brands page for the full list and what each product line fits best.
Pricing for ADU Company in Pomona, CA
| Service | Typical range in Pomona |
|---|---|
| Detached ADU (site-built, 400 – 600 sq ft) | $180,000 – $260,000 |
| Detached ADU (prefab, 400 – 600 sq ft) | $140,000 – $220,000 |
| Garage conversion (attached, 350 – 450 sq ft) | $90,000 – $140,000 |
| Garage conversion (detached, 350 – 450 sq ft) | $110,000 – $160,000 |
| Home addition (primary suite, 300 – 400 sq ft) | $120,000 – $180,000 |
| Home addition (living room or family room, 250 – 350 sq ft) | $90,000 – $150,000 |
| Foundation upgrade (older Pomona home, full ADU pad) | $15,000 – $35,000 |
| Electrical service upgrade (100A to 200A panel) | $4,000 – $8,000 |
| HVAC mini-split system for ADU (cooling + mild-winter heat) | $5,000 – $10,000 |
| Permit and plan set for Pomona ADU | $6,000 – $14,000 |
What pushes a Pomona price toward the top of the range: a pre-1960 foundation that needs piers or a new pad, an electrical panel that’s already maxed out, and a Lincoln Park or Wilton Heights design review that asks for period-matched exterior details. Every Seedling project gets a written price before tools arrive, and that price is backed by the 365-Day Done Right Promise.
Neighborhoods We Serve in Pomona
Our crews work across Pomona, and we schedule around the specific lot and street conditions in each neighborhood. Response for a free estimate in the Pomona area is typically within one to two business days.
- Lincoln Park
- Wilton Heights
- Westmont
- Phillips Ranch
- Ganesha Hills
Service Area – Cities Near Pomona
Along with Pomona itself, Seedling ADU Builders serves nearby San Gabriel Valley and foothill communities. We work regularly in La Verne, CA, San Dimas, CA, Glendora, CA, and Azusa, CA. Scheduling and dispatch are coordinated from the Los Angeles office; crews serve Pomona locally.
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
Most Pomona ADU permit packages clear in 4 to 8 months, depending on whether the property triggers Pomona Heritage design review. Homes in Lincoln Park or Wilton Heights that match the original architecture tend to move faster. We handle the plan set and submittals so families aren’t waiting on a drawing revision. Call (559) 258-5962 to get a permit timeline for your specific lot.
You can often skip the parking requirement if your property is within a half-mile of transit, which covers many of Pomona’s core neighborhoods. Lots on alleys and narrow streets use this waiver more than any other route. We verify the waiver during the estimate so the price reflects your actual permit path.
It means shoe covers and drop cloths inside your home, pet-safe products where there’s a choice, and a photo of the clean-up before the crew leaves each day. A live person also answers the phone 24/7 throughout the build. It applies to every Pomona ADU, garage conversion, and home addition we build. Call (559) 258-5962 for a free estimate and a written price.
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
"Built a backyard unit for us. For a months long project the crew kept the site remarkably tidy, swept daily, and were respectful of our neighbors and our dog. Beautiful result."
- Charlotte Vey"Careful builders who treated our home like we still had to live in it, because we did. Dust controlled, driveway swept nightly, and the finished ADU is beautiful. No surprise costs either."
- Rick Abara"They converted our garage and were so mindful that we were living right there through it. Quiet hours respected, site swept, nothing left out where the kids play. Lovely work."
- Eugene Park
