Contact Costa Mesa ADU Builders

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(833) 589-8273
Our Office3200 Park Center Drive 14th floor
Costa Mesa, CA 92626
Same-Day Service AvailableWe dispatch the nearest available technician. Emergency calls prioritized.
Free, No-Obligation EstimateWe assess the job and give you a written price before any work begins.
Licensed, Insured & GuaranteedEvery job is backed by our workmanship warranty. You're fully protected.

Contact Costa Mesa ADU Builders – Free ADU Estimate in Costa Mesa

Ready to talk about your accessory dwelling unit? Call us at (833) 589-8273 and you’ll reach a live coordinator who can answer your questions and set up a free on-site assessment for your Costa Mesa property. No hard sell, no obligation, no pressure. Just straight answers about what your ADU could look like, what it might cost, and how the process works from first sketch to final inspection. We’ve been building ADUs in Costa Mesa since 2012, and we’re happy to walk you through everything before you commit to anything.

Call (833) 589-8273

What Happens When You Call

Step 1: You call (833) 589-8273. A live coordinator answers during business hours and asks a few basic questions about your property and your goals. You won’t sit on hold, and you won’t get a scripted pitch. You’ll get a real conversation about your Costa Mesa lot, your timeline, and your budget range.

Step 2: We schedule your free assessment. We’ll find a time that works for you to have someone walk your Costa Mesa property. They’ll look at setbacks, access, utility locations, and grading so the estimate you get reflects your actual site, not a generic assumption.

Step 3: You receive a written line-item estimate. Within a few days of the site visit, you’ll get a detailed proposal that breaks down costs by category including design, permits, site work, and construction. No vague lump sums, and no surprise change orders down the road. What we quote is what you pay.

Step 4: We build it, and we stand behind it. Once you approve the estimate, we pull all necessary permits and handle inspections for your Costa Mesa ADU. You’ll know exactly what’s happening at every stage, from foundation to finish. And when the job is done, our workmanship guarantee protects your investment.

Why Costa Mesa Homeowners Call Us First

  • Local Costa Mesa knowledge since 2012. We know Costa Mesa’s zoning quirks, setback requirements, and the neighborhoods where detached ADUs make the most sense. That experience saves you time and money because we’re not learning your city’s rules on your project.
  • Required licensing and insurance on every job. Every pro working under our name is required to hold the license and insurance the state requires for this kind of work. We don’t cut corners on credentials, and we’re happy to show documentation before you sign anything.
  • Transparent pricing with no hidden fees. Your written estimate shows exactly where every dollar goes. If something changes during construction, we discuss it with you before any work proceeds. No surprise line items at the end of the job, ever.
  • Workmanship guarantee you can actually use. When we finish your ADU, you get a warranty on our workmanship in writing. If something isn’t right, you call us and we make it right. That’s been our standard in Costa Mesa for over a decade.

Our Service Area Around Costa Mesa

We’re based in Costa Mesa and serve the surrounding communities throughout the Inland Empire and Riverside County. Typical response times vary by location: Fontana and Rialto are usually reachable within a day, Moreno Valley and Grand Terrace within a day and a half, and Bloomington, Highgrove, and Murrieta within two days. We also regularly travel to March Air Force Base, Sun City, Fallbrook, Romoland, and Murrieta Hot Springs. If your city isn’t listed, call us anyway. If we can’t help, we’ll tell you honestly.

Frequently Asked Questions – Booking & Estimates

Call or Request a Callback

If you’re ready to talk about your ADU, call (833) 589-8273 now. Our team is available Monday through Friday, 7:00 AM to 7:00 PM, and Sunday 7:00 AM to 7:00 PM. We’re closed Saturdays. If you’d rather we call you, leave a message and we’ll get back to you on our next business day. No pressure, no obligation. Just a free estimate and honest answers.

Written by the team at Costa Mesa ADU Builders, serving Costa Mesa since 2012.

Areas We Serve
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