A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Gardena, CA
Most ADU and addition work in Gardena runs $180,000 – $320,000 for a detached unit before site work, and $90,000 – $150,000 for a garage conversion. Gardena’s older stucco homes, tight post-war lots, and warm, dry climate shape almost every build decision here, from foundation depth to setback planning. If you are pricing a second home on your Gardena lot, call Sutton ADU Builders at (472) 248-8213 for a written, no-surprise quote.
Why Gardena Homes Are Different
Gardena’s housing stock runs heavily to post-war single-family homes, many built between 1945 and 1965 on lots that run 50 by 120 feet or smaller. That matters for ADUs because the side and rear setbacks, the required gap between your new structure and the property line, get tight quickly. A 750-square-foot detached unit needs real planning on a 5,000-square-foot lot, not a stock plan dropped onto the parcel.
Soil conditions also vary more than people expect across Gardena. Some pockets near the older commercial core sit on fill that needs deeper footings, while areas closer to the 405 corridor often have more stable native soil. We price for the actual soil report, not an assumption. The climate helps: Gardena’s mild winters allow slab pours and framing nearly year-round, though the summer heat means we schedule roof and exterior work in the early morning when possible. The city’s planning department is thorough but predictable, and most ADU applications here move through without the HOA complications you see in nearby master-planned communities. That makes Gardena one of the more straightforward cities in the South Bay for this kind of work.
Our Main Gardena Services
Gardena homeowners call us most often for three things: a detached ADU, a room addition, or a full home addition. Each has its own Gardena page below with local pricing, process, and what to expect.
Home Addition Contractor in Gardena
A home addition in Gardena usually means extending into a side yard or out the back of a post-war stucco house. Ceiling heights in these older homes often run 8 feet, so tying a new roofline into an existing one requires careful framing and sometimes reframing part of the original roof. Plumbing and electrical panels in houses this age are frequently maxed out, so plan for a subpanel upgrade unless the prior owner already handled it. We pull all Gardena permits, manage inspections, and lock a written price before we start. Miles Hartwell oversees every addition estimate and walks the site himself before numbers go onto paper. For details, see our Home Addition Contractor in Gardena page.
ADU Builders in Gardena
Detached ADUs in Gardena work well because most lots have a workable rear yard behind the house, and the city follows California state ADU rules that streamline setbacks and parking. Typical detached units here run 600 to 1,000 square feet, with the most common configuration being a one-bedroom unit with a kitchenette and full bath. Some Gardena homeowners choose prefab models like Cover or Boxabl to shorten the on-site build time; others prefer stick-built framing for a custom layout. We have installed both, so the conversation starts with your lot, your budget, and your timeline rather than a product we are trying to sell. Read the full Gardena breakdown on our ADU Builders in Gardena page.
Room Addition Contractor in Gardena
A room addition in Gardena often means converting an enclosed porch, expanding a primary bedroom, or adding a family room at the rear of the house. These smaller projects still need full permits and a foundation that meets current code, and on older Gardena lots the existing concrete may need to be cut back or replaced entirely. We also see many garage-to-bedroom conversions in Gardena, which require insulation, drywall, egress windows, and a heating/cooling source to pass inspection. Our written price includes all of that before we begin. To see room addition specifics for Gardena, visit our Room Addition Contractor in Gardena 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 Gardena
We work regularly with Dvele, Mighty Buildings, and Boxabl prefab systems in Gardena, and we stock common hardware for James Hardie cladding and Tuff Shed conversions locally. Typical parts lead time for prefab panel replacements runs one to two weeks. See our brands page for the full lineup.
Pricing for ADU Company in Gardena, CA
| Service | Typical range in Gardena |
|---|---|
| Detached ADU (600 – 1,000 sq ft) | $180,000 – $320,000 before site work |
| Garage conversion ADU | $90,000 – $150,000 |
| Attached ADU addition | $130,000 – $220,000 |
| Room addition (150 – 300 sq ft) | $60,000 – $110,000 |
| Home addition (400 – 800 sq ft) | $110,000 – $240,000 |
| Prefab ADU (module + site work) | $160,000 – $280,000 |
| Foundation and site preparation | $18,000 – $40,000 |
| Utility connections and permits | $8,000 – $20,000 |
Site conditions in Gardena push price up when soil reports require deeper footings, when the existing electrical panel needs replacement, or when the yard needs significant grading. Every project gets a written price before any work begins, and the 365-Day Done Right Promise covers workmanship for one full calendar year after completion.
Neighborhoods We Serve in Gardena
We work across Gardena, from the older blocks near the 91 freeway to the quieter residential streets south of Rosecrans Avenue. Response time for bids anywhere in Gardena is typically one to two business days.
- Northeast Gardena
- Southwest Gardena
- Strawberry Square area
- Moneta area
- Freeman Avenue corridor
Service Area – Cities Near Gardena
While this page covers Gardena specifically, we also serve homeowners in nearby South Bay and South LA cities. If you are just outside Gardena, check our pages for Lawndale, CA, Hawthorne, CA, Compton, CA, and Torrance, CA. Dispatch and scheduling are coordinated from our Los Angeles office, with crews serving Gardena locally.
Serving Gardena, CA - Our Local Coverage Area
We’re based in the Gardena 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 Gardena
Most Gardena ADUs start within four to eight weeks after we finalize your written quote, depending on permit processing time and your product choice. Prefab models like Dvele or Boxabl can shorten on-site work, though permits still take the same city review time. Call (472) 248-8213 for a real start-date estimate based on your specific lot.
Yes. We manage the full Gardena permit application, plan check, and inspection process on every project. Gardena follows California ADU streamlining rules, which keeps most permits moving faster than older local ordinances once did. We pull all necessary permits before work begins and schedule every inspection with the city.
Yes. Every Sutton technician and crew member who visits your Gardena home is background-checked and identity-verified under the Threshold Standard. We send you their name and photo before the visit, and they arrive in a marked uniform with a photo ID badge. That applies to every site visit, from the first measurement to the final walkthrough.
Ready for a real number? Call Sutton ADU Builders at (472) 248-8213. A live person answers, and we will schedule your free Gardena estimate with Miles Hartwell’s team.
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 Gardena Customers Say
"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."Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F.
