Dimas was great. He was affordable. Our ADU looks so luxurious. All our friends and family love it. Dimas runs a clean jobsite. We are very pleased with how the ADU came out.
License VerifiedServing Long Beach, Huntington Beach, Los Angeles County · Based in Long Beach, CA
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ADU Certified is a CSLB-verified contractor listed in Los Angeles County with classification B.
7+ years building ADUs · CSLB 1041789 · B - General Building Contractor
Pricing varies by unit type, size, finishes, and site conditions. Unlock ADU Certified's project pricing for your lot — free, no obligation.
| Unit type | Typical size | Pricing |
|---|---|---|
| Studio / JADU | ≤ 500 sq ft | Pricing locked — unlock to view |
| 1-bedroom detached ADU | 600–750 sq ft | Pricing locked — unlock to view |
| 2-bedroom detached ADU | 750–1,000 sq ft | Pricing locked — unlock to view |
| Garage conversion | 400–600 sq ft | Pricing locked — unlock to view |
| Attached ADU | 400–800 sq ft | Pricing locked — unlock to view |
Pricing is unlocked per project
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In-house design and full permit handling.
Turnkey ground-up and conversion builds.
Guidance and lender introductions.
ADU formats this builder takes on.
What's covered after move-in.
Dimas was great. He was affordable. Our ADU looks so luxurious. All our friends and family love it. Dimas runs a clean jobsite. We are very pleased with how the ADU came out.
Dimas was fantastic to work with! He was upfront about cost and timeline, including ways we could save money and what all our options were. He kept us updated every step of the way, coming by multiple times a week in evening after we had gotten home from work to fill us in on progress and next steps. He was incredibly patient with all of our last-minute changes and kept a positive attitude through it all! We could not be happier with the result, and have recommended Dimas to all of our friends and neighbors in the area!
Hired this company from a referral from another contractor. I already had the plans done but he noticed that the plans were going to interfere with the SCE wires so I checked with SCE and sure enough, had I started construction, would have had to stop and rework everything. In the end he saved me tens of thousands of dollars. Gave me a written contract to sign and even after some upgrades, he still honored the original price with zero additional charges. He also told me the project would take about 6 months, which I did not believe because, as we all know, contractors are not the most honest people in the world (did you see the movie the Money Pit?) The project took 6 months and 2 weeks...I couldn't believe it. Everything came out amazing. Highly recommend ADU certified!!!
We had an excellent experience with ADU certified. Dimas was always involved and keeping us updated with the good and the bad. He kept to the budget. Would highly recommend.
My husband and I had a wonderful experience using ADU Certified to convert our garage into an ADU. Dimas was extremely accommodating, professional, friendly, and responded to our concerns immediately. We are very happy with the way the conversions turned out. The first tenants who saw the place told me not to show our place anymore to another renter as they were impressed too. We highly recommend them for your ADU build!
ADU Certified is a full-service ADU builder serving Long Beach, CA, handling design, permitting, and turnkey construction for detached ADUs, attached ADUs, garage conversions, and junior ADUs (JADUs). ADU Certified holds a 5.0-star rating across 7 verified homeowner reviews.
Yes. ADU Certified holds an active CSLB license (1041789), classified B - General Building Contractor, and is bonded and insured.
ADU Certified prices every ADU per project — your cost depends on size, finishes, and site conditions. Garage conversions are the most affordable path; detached units cost more. Pricing is unlocked per project: request a quote to get ADU Certified's exact, no-obligation estimate for your lot.
ADU Certified builds ADUs in Long Beach, Huntington Beach, Los Angeles County.
Most ADU projects run 6–12 months end to end — roughly 1–2 months for design and permitting (California caps plan check at 60 days for compliant units) and 4–8 months of construction. ADU Certified confirms a timeline for your specific project during the feasibility consultation.
Tap any "Get a Quote" button on this page to share a few details about your property and project. We'll confirm your service area, match you directly with ADU Certified, and set up your free feasibility consultation — no obligation.