A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Bellflower, CA
Benson ADU Builders handles accessory dwelling units, home additions, and room additions across Bellflower, CA from permits to final paint. We’re the team homeowners call when they want a written price before any work starts, plus a 365-Day Done Right Promise stamped on every project. Bellflower’s post-war housing stock and flat, fenced lots mean most homeowners have real potential in their backyard or side yard. Call (903) 568-7222 to schedule a free estimate, and we’ll walk you through what’s possible on your specific lot.
Why Bellflower Homes Are Different
Bellflower was built up mostly between the 1940s and 1960s, so many homes here sit on deeper lots than you’ll find in newer LA County developments. That matters for ADU placement. A detached unit in Bellflower often slides into a backyard that’s 60 to 70 feet deep, where a lot line runs along the garage instead of against a neighbor’s living room. Site-built and prefab ADUs both work here, but the placement conversation starts with your actual lot dimensions, not a catalog photo.
The flat terrain in Bellflower keeps site prep straightforward: minimal grading, no retaining walls, and deliveries that don’t fight a hillside. What does come up constantly is soil movement. The clay-heavy ground across this part of Los Angeles County expands and contracts with rain, so foundation work on any addition needs to account for that from day one. Add in Bellflower’s warm, dry summers and mild winters, and most projects can run year-round without weather shutdowns. Permit reality is LA County-level paperwork with Bellflower’s local review, and we handle that end to end.
Our Main Bellflower Services
Bellflower homeowners call us most for two things: adding a completely separate living unit in the backyard, and extending the existing house. Here’s what each looks like locally.
ADU Builders in Bellflower
An ADU in Bellflower means a separate, permitted dwelling on the same lot as your main house. Most of the ADUs we build in Bellflower are backyard units in the 400 to 700 square foot range, either site-built or prefab panels from brands like Abodu and Dvele. Bellflower’s deep lots regularly make a detached ADU possible where a garage conversion would mean giving up parking that your household actually uses. We handle setbacks, utility runs, and every permit detail along the way. ADU Builders in Bellflower
Home Addition Contractor in Bellflower
A home addition in Bellflower extends the footprint of your existing house: a bigger kitchen, a new primary suite, or a family room bump-out. Many mid-century homes in Bellflower have sound framing but tight floor plans, so the addition often runs toward the back of the lot where the yard is widest. We pull permits, match roof lines and exterior materials, and keep the work clearly priced from the start. Home Addition Contractor in Bellflower
Room Addition Contractor in Bellflower
A room addition in Bellflower is one new space rather than a whole wing: think a home office, a guest bedroom, a second bathroom, or a den. These projects sit somewhere between a swap-out remodel and a full addition, and in Bellflower’s older homes we often find electrical panels that need a sub-panel or full upgrade to handle the new square footage. That cost goes into your written quote upfront, not a surprise invoice later. Room Addition Contractor in Bellflower
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 Bellflower
We’re authorized to build with Abodu, Dvele, Mighty Buildings, and Cover, plus we install James Hardie cladding on site-built work. Prefab panels arrive staged to your Bellflower lot, which keeps on-site time down even when your street is tight. See the full lineup on our brands page.
Pricing for ADU Company in Bellflower, CA
Here’s what Bellflower homeowners should expect before ever tapping call:
| Service | Typical range in Bellflower |
|---|---|
| Prefab ADU (studio, 400 – 500 sq ft) | $180,000 – $260,000 |
| Prefab ADU (1-bed, 500 – 650 sq ft) | $220,000 – $320,000 |
| Prefab ADU (2-bed, 650 – 800 sq ft) | $280,000 – $420,000 |
| Site-built ADU (1-bed, 500 – 600 sq ft) | $210,000 – $310,000 |
| Site-built ADU (2-bed, 700 – 900 sq ft) | $300,000 – $450,000 |
| Garage conversion ADU | $140,000 – $240,000 |
| Home addition (single room, 200 – 400 sq ft) | $80,000 – $160,000 |
| Home addition (primary suite, 400 – 600 sq ft) | $140,000 – $260,000 |
| Room addition (home office or guest bed, 150 – 300 sq ft) | $60,000 – $120,000 |
What pushes a Bellflower quote higher is usually site work you can’t see from the street: panel upgrades, sewer line rerouting, or foundation corrections for that expansive clay soil. What doesn’t change the price is scope creep, because our written price covers the job as agreed. You’ll never see a change order unless you ask for one.
Neighborhoods We Serve in Bellflower
We work across the entire Bellflower area, from the neighborhoods around Bellflower Boulevard to the residential streets near the 91 and 605. Most of our Bellflower projects are within 15 minutes of each other, which keeps our scheduling tight and our crews close.
- Bellflower Manor
- Downtown Bellflower area
- North Bellflower, near the 605
- East Bellflower, near the San Gabriel River
Service Area – Cities Near Bellflower
If you’re just outside Bellflower proper, we work in Paramount, CA, Norwalk, CA, Artesia, CA, and Cerritos, CA. Same written price promise, same crews, same guarantee.
Serving Bellflower, CA - Our Local Coverage Area
We’re based in the Bellflower 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 Bellflower
We schedule Bellflower estimates within a few days of your call, and once the written price is approved, the project enters the city permit queue. The timeline after that depends on Bellflower’s current review volume, but we keep you updated through the whole process. Call (903) 568-7222 for a free estimate and a realistic start window.
Yes, Bellflower reviews ADU and addition plans through its building department, and the process follows California ADU law for things like setbacks and lot coverage. We prepare the complete permit submittal for you and manage comments until approval. Call (903) 568-7222 to have us check your property’s specifics.
No. Your written price covers the scope we agreed on before work begins. If we uncover something buried and unexpected during construction, we document it, explain the cost in writing, and get your approval before touching it. We don’t bill surprises after the fact. That’s the whole point of the no-hassle upfront pricing.
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 Bellflower Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
