Well Done Building & Design ADU projectLicense Verified

Well Done Building & Design

Serving Costa Mesa, Newport Beach, Orange County · Based in Costa Mesa, CA

Pricing on request — unlock Well Done Building & Design's ADU pricing for your project

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Well Done Building & Design ADU project 1
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Well Done Building & Design ADU project 3
Well Done Building & Design ADU project 4
Well Done Building & Design ADU project 5

About Well Done Building & Design

Well Done Building & Design is a CSLB-verified contractor listed in Orange County with classification B.

8+ years building ADUs · CSLB 1040701 · B - General Building Contractor

Well Done Building & Design ADU pricing

Pricing varies by unit type, size, finishes, and site conditions. Unlock Well Done Building & Design's project pricing for your lot — free, no obligation.

Unit typeTypical sizePricing
Studio / JADU≤ 500 sq ftPricing locked — unlock to view
1-bedroom detached ADU600–750 sq ftPricing locked — unlock to view
2-bedroom detached ADU750–1,000 sq ftPricing locked — unlock to view
Garage conversion400–600 sq ftPricing locked — unlock to view
Attached ADU400–800 sq ftPricing locked — unlock to view

Pricing is unlocked per project

Share a few details and we'll send Well Done Building & Design's pricing for your build.

Services Well Done Building & Design offers

  • Detached ADUs
  • Attached ADUs
  • Garage Conversions
  • Junior ADUs (JADU)
  • Permitting

What Well Done Building & Design handles

Design & permitting

In-house design and full permit handling.

  • Architectural design & 3D renderings
  • Structural & Title 24 energy plans
  • City plan-check submittal & corrections

Construction

Turnkey ground-up and conversion builds.

  • Foundation & framing
  • Detached, attached & garage-conversion ADUs
  • Electrical, plumbing & HVAC

Financing

Guidance and lender introductions.

  • Renovation / construction-loan guidance
  • HELOC & cash-out refinance referrals
  • ADU-specific (after-build-value) lenders

Project types

ADU formats this builder takes on.

  • Detached ADU
  • Attached ADU
  • Garage / ADU conversion

Warranty & support

What's covered after move-in.

  • Workmanship warranty
  • Manufacturer materials warranties
  • Dedicated project manager

Reviews of Well Done Building & Design

3.97 reviews
Verified

My wife and I hired Zac and his team at Well Done for a home addition and full remodel, and to say the experience was pleasant would be an understatement. From start to finish, Zac and his team guided us through every step of the process, and the final product turned out even better than we could have imagined. They truly gave us our forever home. All work was properly permitted and completed within the estimated timeline they originally provided. Like any major project, a few issues came up along the way, but Zac was always there to work with us and help get everything across the finish line smoothly. What really stood out was the level of support even after the project was completed. Zac continued to take our calls and help address the little nuances that naturally come with a remodel of this size. We would absolutely use Zac and the Well Done team again and highly recommend them to anyone considering a remodel or addition project.

Chris Corsaro0 found this helpful
Verified

I couldn’t be happier with my experience with Well Done Builders. The build I moved into is absolutely top notch, and the entire process has been seamless thanks to Brendan. He’s been incredibly helpful, responsive, and an absolute pleasure to work with always making sure every detail was taken care of. The craftsmanship and professionalism from start to finish exceeded my expectations. I highly recommend Well Done Builders to anyone looking for quality work and a team that truly cares about their clients.

Keoni Rabaino0 found this helpful
Verified

I absolutely despise seeing your trucks in cm. The work you have done is mediocre and you don’t follow regulations.

Molly Doughty0 found this helpful
Verified

I have had the distinct privilege and pleasure to work with Zac and the team at Well Done Building and Design on an investment property we built together. We partnered as investors together to bring a vision, a unicorn property to fruition. From beginning to end, the team continually out performed all expectations. Their unwavering faith and determination brought the remarkable transition of this home. A gem of a home that the neighborhood deserved. If you are looking for a General Contractor to partner with on an investment property or remodel your primary residence to make your dream home, Zac and the team should be your first call. They handle it all from in-house architectural design team to rough construction to the curated finishes its all you need!

Kip Adkins0 found this helpful
Verified

Zac and his team are true pros and truly nice guys. They renovated my living space, kitchen and exterior. It turned out more amazing than I imagined. I've also asked them to come out and tackle some smaller projects (door install, electrical) and they're always willing take them on. Highly recommend.

Helen Morales0 found this helpful

Frequently asked questions about Well Done Building & Design

What does Well Done Building & Design offer?

Well Done Building & Design is a full-service ADU builder serving Costa Mesa, CA, handling design, permitting, and turnkey construction for detached ADUs, attached ADUs, garage conversions, and junior ADUs (JADUs). Well Done Building & Design holds a 3.9-star rating across 7 verified homeowner reviews.

Is Well Done Building & Design licensed and insured?

Yes. Well Done Building & Design holds an active CSLB license (1040701), classified B - General Building Contractor, and is bonded and insured.

How much does Well Done Building & Design charge to build an ADU?

Well Done Building & Design 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 Well Done Building & Design's exact, no-obligation estimate for your lot.

What areas does Well Done Building & Design serve?

Well Done Building & Design builds ADUs in Costa Mesa, Newport Beach, Orange County.

How long does Well Done Building & Design take to build an ADU?

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. Well Done Building & Design confirms a timeline for your specific project during the feasibility consultation.

How do I get a quote from Well Done Building & Design?

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 Well Done Building & Design, and set up your free feasibility consultation — no obligation.

Where Well Done Building & Design works

Costa Mesa, CAService-area map
Street View
  • City Building & Safety
  • Planning Department
  • Permit Center

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