ADU Company in Costa Mesa, CA
Lodgewick ADU Builders handles accessory dwelling units, garage conversions, and home additions across Costa Mesa, CA, and most projects here share a common thread: the housing stock is older, the lots are generous, and the city sits outside the Coastal Commission’s jurisdiction. That combination makes Costa Mesa one of the least complicated places in coastal Orange County to get an ADU permitted. If you’re weighing a detached unit in the backyard or converting an unused garage, call (254) 602-5618 for a free estimate and we’ll give you a written price before any work begins.
Why Costa Mesa Homes Are Different
Costa Mesa’s residential neighborhoods – College Park, Mesa del Mar, and the older Eastside blocks near 17th Street – were largely built between the 1950s and 1970s. Those post-war tract homes almost always include a detached single-car garage, which is why garage-conversion ADUs are the dominant project type here. A conversion often makes more sense than new construction because the structure already exists, but the foundation is where Costa Mesa jobs get interesting. Many of those original garages were poured as minimal slab-on-grade with no perimeter footings, and once the space becomes habitable under current California Building Code, that slab typically triggers a full foundation upgrade. A local contractor who knows Costa Mesa budgets for that line item before the first permit application is filed.
The second thing we see regularly is moisture. Costa Mesa sits close enough to the coast that marine-layer humidity hangs around even in summer, and newly enclosed garage conversions here develop mold and condensation issues if vapor barriers and cross-ventilation aren’t explicitly detailed in the plans. That’s a local condition we design for from day one. And a detail most homeowners don’t know until they start: Costa Mesa is home to Orange Coast College with its 20,000-plus students, which gives ADUs in this city a sustained rental market that coastal neighbors like Newport Beach and Huntington Beach simply don’t share. That’s a real financial consideration when you’re deciding between building a unit and leaving the garage as storage.
Our Main Costa Mesa Services
Most Costa Mesa homeowners reach out to us about one of three projects: adding square footage to the main house, turning a garage into living space, or building a standalone ADU from the ground up. Each is handled by its own dedicated page, linked below.
Home Addition Contractor in Costa Mesa
Home additions in Costa Mesa usually mean expanding sideways into a side yard or building up over an existing single-story footprint. The older Eastside lots tend to be narrow, so setbacks dictate a lot of the design before a single wall goes up. Our Home Addition Contractor in Costa Mesa page walks through what the city’s permitting process looks like, realistic timelines, and how we keep the addition tied into the existing roofline without it looking like an afterthought. Russ Delmar oversees every Costa Mesa addition personally, and every project gets a written price and written guarantee before work starts.
Garage Conversion Contractor in Costa Mesa
A garage conversion in Costa Mesa almost always involves that slab-on-grade foundation question we mentioned above. Many of these 1950s garages need a perimeter footing retrofit before the space can legally become a bedroom or studio, and we factor that into the written quote from day one. The Garage Conversion Contractor in Costa Mesa page details what a typical conversion costs here, how moisture control is handled, and what the permit path looks like under Costa Mesa’s zoning. If you’ve got a detached single-car garage sitting empty, it’s often the fastest path to a rental unit on your lot.
ADU Builders in Costa Mesa
Detached ADUs in Costa Mesa work well on the larger College Park and Mesa del Mar lots, where there’s enough rear yard to keep the unit separate from the main house. Because most of Costa Mesa falls outside the Coastal Commission’s permit authority, a detached ADU here goes through a single city-level approval, which can cut months off the timeline compared to the same project in coastal Newport Beach. Our ADU Builders in Costa Mesa page covers floor-plan options, prefab versus stick-built, and the real cost range for detached units on Costa Mesa lots. All work carries The Kingswell Guarantee in writing.
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 Costa Mesa
We work with established prefab and materials brands including our brands like Abodu, Cover, and James Hardie, matched to each Costa Mesa lot, budget, and timeline. Whether your project runs best with a prefab module or traditional framing with Hardie siding, we’ll walk through the tradeoffs before you commit.
Pricing for ADU Company in Costa Mesa, CA
| Service | Typical range in Costa Mesa |
|---|---|
| Detached ADU (new build, prefab or stick-built) | $180,000 – $420,000 |
| Garage conversion ADU | $110,000 – $220,000 |
| Junior ADU (JADU) conversion | $70,000 – $140,000 |
| Garage conversion (storage to living space, no kitchen) | $60,000 – $110,000 |
| Foundation upgrade for 1950s slab-on-grade garage | $15,000 – $40,000 |
| Home addition (master suite, 300-450 sq ft) | $150,000 – $300,000 |
| Home addition (kitchen expansion, 200-350 sq ft) | $90,000 – $200,000 |
| Utility connection and trenching for detached ADU | $12,000 – $30,000 |
What pushes a Costa Mesa project toward the top of these ranges is usually the foundation retrofit on older garages, followed by moisture-control upgrades that inland cities don’t require. We give you a written price before any work starts, and that number doesn’t change at the door. Your written quote is your price, period.
Neighborhoods We Serve in Costa Mesa
Our Costa Mesa crews work across the city, from the student-heavy neighborhoods around Orange Coast College to the quieter Eastside streets and the larger lots in Mesa del Mar. Scheduling is coordinated from our Los Angeles office, and we typically reach any Costa Mesa neighborhood within one business day for estimates and site visits.
- College Park
- Mesa del Mar
- Eastside Costa Mesa
- South Coast Metro
- Westside Costa Mesa
Service Area – Cities Near Costa Mesa
Lodgewick ADU Builders also serves homeowners in the cities around Costa Mesa, including nearby Newport Beach, CA, Fountain Valley, CA, Huntington Beach, CA, and Santa Ana, CA. If you’re on the border between Costa Mesa and one of these cities, call us and we’ll confirm coverage for your specific street before scheduling a site visit.
Serving Costa Mesa, CA - Our Local Coverage Area
We’re based in the Costa Mesa 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 Costa Mesa
Most Costa Mesa homeowners hear back the same day, and a live person answers our phones 24/7 – no voicemail loops. Site visits and written estimates are typically scheduled within one business day, depending on your availability. Call (254) 602-5618 and you will speak to a person, not a chatbot.
No. Most of Costa Mesa falls outside the California Coastal Commission’s permit jurisdiction, so an ADU here goes through the city’s own planning and building department only. That single-approval path can save months compared to coastal Newport Beach. We handle the permit package for you.
If you’re converting an original 1950s-1970s detached garage, very likely yes. Those slabs were often poured without perimeter footings, and current building code requires a proper foundation for habitable space. We inspect and include that cost in the written estimate up front, so you’ll never face a surprise line item after work starts. Call (254) 602-5618 to schedule your free estimate.
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 Costa Mesa Customers Say
"Garage conversion into a studio for our teenager. Honest about what was realistic and what wasn't, finished close to schedule, and cleaned up the site daily."
- Marcus Beaumont"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt"Junior ADU conversion inside the house. They protected the rest of our place with plastic and daily cleanup. Done nearly on schedule and on the number they quoted."
- Sabrina Veld