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
An ADU in Gardena usually runs $120,000 – $350,000 depending on whether you build detached, convert an existing garage, or attach to the house. Permits move through the city’s planning and building departments, and the whole process typically takes 9 to 18 months from design to final inspection. We put the price in writing before any work starts, so the number you approve is the number on the final invoice. If you want a straight answer on what your Gardena lot can support, call us at (361) 315-4177.
Why Gardena Homes Are Different
Gardena’s housing stock is mostly mid-century single-family homes built between the 1940s and 1960s, and that age shows up in specific ways on an ADU job. Many lots were graded flat, which helps with foundation work, but the original sewer laterals and electrical panels are often undersized by current code. A detached ADU in Gardena almost always requires a panel upgrade or a separate service feed, and some homes still have clay sewer pipes that need replacement before the city signs off on a new connection.
Lot shapes are another variable. Gardena blocks are relatively uniform, but setbacks and side-yard requirements change what fits. In neighborhoods like Hollypark and Moneta Gardens, lot width usually drives the decision between a detached unit and a garage conversion. If the interior side yard is under five feet, a setback variance, meaning the city’s written permission to build closer to the property line than the standard rule allows, may be required. That adds time to the permit phase. Your best move is to check what your specific lot can hold before you commit to a floor plan.
Our Main Gardena Services
Gardena homeowners call us most about three things: a room addition when the family has outgrown the house, a garage conversion when they want rental income or an in-law suite without building new, and a from-scratch ADU when the backyard has the space.
Room Addition Contractor in Gardena
Room additions in Gardena usually attach to the rear or side of the existing home, which means the new roofline has to tie into a 60-year-old framing system without leaks. We handle the engineering, the permit drawings, and the build, and our crew works from a written scope so there’s no confusion about what’s included. If you’re exploring this option, start with our Room Addition Contractor in Gardena page, which breaks down common layouts and cost ranges.
Garage Conversion Contractor in Gardena
Converting a detached or attached garage in Gardena is usually the fastest path to a rentable unit, since the foundation and framing already exist. The catch is that many older garages were never insulated, the slab may not have a vapor barrier, and the city requires the conversion to meet the same energy and habitability standards as new construction. Our Garage Conversion Contractor in Gardena page covers what a typical conversion costs and what the inspection sequence looks like.
ADU Builders in Gardena
Building a new ADU in Gardena gives you the most control over layout, ceiling height, and long-term durability. We build conventional wood-frame units with James Hardie siding and also work with prefab platforms like Cover and Dvele, which can compress the on-site build time significantly on a clean, accessible lot. For a full breakdown of what each method costs and which fits your property, see our ADU Builders 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 Cover, Dvele, and Boxabl units in Gardena, and we coordinate directly with the manufacturer on delivery, crane placement, and utility hookups. Because we handle the site work and the brand’s own specs, warranty claims don’t fall between two parties. See our brands page for the full list of platforms we work with.
Pricing for ADU Company in Gardena, CA
| Service | Typical range in Gardena |
|---|---|
| Attached ADU (studio, ~400 sq ft) | $120,000 – $180,000 |
| Attached ADU (1 bed, ~600 sq ft) | $160,000 – $230,000 |
| Attached ADU (2 bed, ~800 – 1,000 sq ft) | $220,000 – $310,000 |
| Detached ADU (studio, ~400 sq ft) | $140,000 – $210,000 |
| Detached ADU (1 bed, ~600 sq ft) | $180,000 – $260,000 |
| Detached ADU (2 bed, ~800 – 1,000 sq ft) | $250,000 – $350,000 |
| Garage conversion (existing structure, 1 bed) | $90,000 – $150,000 |
| Garage conversion (existing structure, 2 bed) | $130,000 – $200,000 |
| Room addition (primary suite, ~400 sq ft) | $150,000 – $220,000 |
| Room addition (family room + bath, ~500 sq ft) | $180,000 – $280,000 |
What pushes a Gardena job higher is almost always below-grade: sewer lateral replacement, panel upgrades, or slab demolition for a garage conversion that needs a new foundation. Every Fielding ADU Builders project gets a written price before any work starts. That number includes the scope, the materials, and the labor, so the only way the price changes is if you change your mind on something mid-job.
Neighborhoods We Serve in Gardena
We work across Gardena, from Hollypark to Moneta Gardens, Strawberry Park, and the streets east of Western Avenue. Our crews stage locally, so a site visit in Gardena can usually be scheduled within a few business days.
- Hollypark
- Moneta Gardens
- Strawberry Park
- East Gardena
- South Gardena
Service Area – Cities Near Gardena
We take on ADU, garage conversion, and room addition projects in Gardena and the surrounding South Bay cities. If you’re in Lawndale, CA, Hawthorne, CA, Compton, CA, or Torrance, CA, we can schedule a free estimate at your property. The permitting process changes city by city, so the conversation starts with what your local building department requires.
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
Site visits in Gardena can usually be scheduled within a few business days, and the permit phase typically takes 3 to 6 months depending on the city’s current workload. We don’t promise same-day starts on a build this size, but we do give you a written schedule before the contract is signed. Call (361) 315-4177 to get a site visit on the calendar.
Gardena has some HOA-governed pockets, and while California state law limits an HOA’s ability to ban ADUs outright, the architectural review process can still add time. We’ll help you identify what your specific HOA requires and factor that into the schedule so it doesn’t surprise you later.
The first step is a site evaluation so you know what your lot, setbacks, and existing utilities can support. We’ll give you a written price for the specific scope, not a vague range. Call (361) 315-4177 to schedule a free estimate with Reed Calloway and our Gardena 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
"Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Foundation and slab poured on schedule. Crew kept the yard orderly."
- Marian J."Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B.
