A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Lomita, CA
Adding an ADU, garage conversion, or room addition in Lomita means working with a city that has its own permitting rhythm, a housing stock dominated by 1940s through 1960s single-family homes, and lots that are tighter than what you’ll find in neighboring Torrance. Fielding ADU Builders handles all three, with a written price before any work starts and a one-year written guarantee on every project. If you’re weighing your options, call (361) 315-4177 and you’ll get a live person, not a callback queue.
Why Lomita Homes Are Different
Lomita’s original housing stock was built fast after the war, and most of it is still standing. That means pier-and-beam foundations, 2×4 framing, and electrical panels that predate modern load calculations. Any ADU or addition here starts with a foundation and panel assessment, because a 100-amp panel from 1955 will not carry a new unit’s heat pump, range, and dryer without an upgrade. We price that assessment into the written quote, so it doesn’t surprise you mid-job.
The lots matter too. Lomita’s R-1 zoned parcels run narrow and deep, and many sit on the slope rising toward Palos Verdes. Setback requirements are strict, especially on corner lots along streets like Narbonne Avenue and Walnut Street, where the city measures from the property line, not the curb. A garage conversion along the alley side of a Lomita lot often triggers a different review than one facing the street. We flag these conditions in the first walkthrough because they change both the design and the permit path.
Two other local realities shape Lomita work. The marine layer off the coast keeps mornings damp well into summer, so exterior framing and siding need proper flashing and drainage details, not just standard caulk lines. And the city’s planning department reviews ADU applications against the current building code, not the code from when the main house was built, which is why so many Lomita permits stall at the plan-check stage. A contractor who has been through that review before is worth the call.
Our Main Lomita Services
Most Lomita homeowners call us for one of three jobs: a room addition, a garage conversion, or a backyard ADU. Each has its own page with local pricing and permit specifics.
Room Addition Contractor in Lomita
A room addition in Lomita usually means extending off the back of the house or converting an enclosed porch into conditioned square footage. The foundation work is the critical part: many Lomita homes sit on raised foundations that need new footings tied to the original stem wall. We handle the structural drawings, the permit set, and the build itself. The city reviews additions under the same residential code as the main house, so expect a plan-check cycle of two to four weeks depending on the season. Room Addition Contractor in Lomita covers pricing, timelines, and the permit sequence in detail.
Garage Conversion Contractor in Lomita
Many Lomita garages were built as detached structures behind the house, which makes them good candidates for conversion, but the electrical and plumbing connections run farther, and the slab may not meet current insulation or moisture-barrier standards. We test the slab, run the utilities, and reframe the interior to meet ceiling-height and egress requirements. The city often treats these as change-of-use permits, which means a separate inspection path from an addition. Garage Conversion Contractor in Lomita explains what triggers each inspection and what a typical conversion costs here.
ADU Builders in Lomita
Backyard ADUs in Lomita fall under California’s statewide ADU standards, which keep setbacks at four feet for detached units, but the city still reviews for height, lot coverage, and sewer capacity. We build conventional stick-frame ADUs and also work with prefab platforms where the lot and budget line up, including Abodu, Cover, and Dvele. The prefab route can cut site time meaningfully on a narrow Lomita lot. ADU Builders in Lomita walks through build methods, lot requirements, and local pricing.
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 Lomita
We work with James Hardie siding on conventional builds and with prefab ADU platforms including Abodu, Cover, and Dvele. Materials are ordered through our Los Angeles operations office and staged for Lomita deliveries. Any warranty claim on a named brand is handled through the manufacturer, but we handle the coordination so you’re not chasing a call center. See our brands for the full list.
Pricing for ADU Company in Lomita, CA
| Service | Typical range in Lomita |
|---|---|
| Room addition, 200 – 400 sq ft | $52,000 – $118,000 |
| Room addition, 400 – 700 sq ft | $86,000 – $182,000 |
| Room addition, 700 – 1,000 sq ft | $124,000 – $224,000 |
| Garage conversion, attached | $48,000 – $74,000 |
| Garage conversion, detached | $58,000 – $92,000 |
| Detached ADU, studio (400 – 500 sq ft) | $104,000 – $168,000 |
| Detached ADU, 1-bedroom (500 – 700 sq ft) | $128,000 – $198,000 |
| Detached ADU, 2-bedroom (700 – 900 sq ft) | $164,000 – $224,000 |
| Prefab ADU, studio (400 – 500 sq ft) | $78,000 – $128,000 |
| Prefab ADU, 1-bedroom (500 – 700 sq ft) | $96,000 – $152,000 |
| Prefab ADU, 2-bedroom (700 – 900 sq ft) | $122,000 – $178,000 |
Sloped lots, panel upgrades, and sewer-line replacements push Lomita prices toward the upper end of these ranges. Every quote we give is a written price before work starts; if the scope doesn’t change, the number on the final invoice matches the number you approved on day one.
Neighborhoods We Serve in Lomita
We work across Lomita, from the flat blocks south of Lomita Boulevard up into the slope near the Palos Verdes border. The neighborhoods here are dense and well kept, and most jobs sit mid-block where access for a concrete truck or a crane needs to be planned in advance.
- Lomita Pines
- Lomita Hills
- North Lomita
- South Lomita, near the Torrance border
- Lomita Village
Service Area – Cities Near Lomita
Fielding ADU Builders serves Lomita and the surrounding South Bay cities. If you’re in a neighboring community, we cover the same services there. Torrance, CA and Lakewood, CA are frequent service areas, along with Carson, CA and Rancho Palos Verdes, CA.
Serving Lomita, CA - Our Local Coverage Area
We’re based in the Lomita 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 Lomita
Plan review in Lomita typically takes two to four weeks for an ADU or addition once the permit set is submitted, so a realistic start date is four to eight weeks after we finalize your drawings. The first step is a site walk and a written quote, which we can schedule within a few business days. Call (361) 315-4177 and we’ll set it up.
Yes. We prepare the plan set, submit to the city, respond to plan-check comments, and schedule inspections through final sign-off. The permit fee itself is paid by you directly to the city, but we manage the paperwork and the review process from start to finish.
The Garrison Standard covers workmanship defects for 365 days in writing. If something fails inside that year, we come back and correct it at no charge. That guarantee is spelled out on paper before the work starts, not promised over the phone. Call (361) 315-4177 for an exact quote on your Lomita project; estimates are free.
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 Lomita Customers Say
"Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G."Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O."Built a detached ADU behind our house. The builder is a veteran and runs the site like a platoon: schedule posted, crew on time, everything labeled. Finished within a few days of the date."
- Ken W.
