Built by MARS · CSLB #1138550 (949) 787-2662
Free Estimate

Let’s Talk ADU& Remodeling

We design, permit, and build ADUs and remodels across Southern California. One licensed team handles it all, from the first plan to move-in day.

  • Free consultation, no obligation
  • One team from design to move-in
  • We handle the plans and city permits

Takes 30 seconds. No obligation.

Check Your Property’s ADU Eligibility

A member of our team replies within 1 business day.

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    What We Build

    An ADU is a second home on your lot, with its own entrance, kitchen, and bathroom. Pick a project, then drag the slider to see the difference.

    The same backyard with a new detached ADU cottage, lawn, and paver path Empty backyard with dry patchy grass and an old wood fence

    Detached ADU

    A separate small house in your backyard, with its own front porch.

    We also build:Second-story ADUsRoom additionsWhole-home remodels

    Photos are AI-generated illustrations of typical projects, not actual MARS work.

    How It Works

    Four steps on how it works.

    1. Free Consultation

      Understanding your vision in our consultation.

    2. Design & Options

      We draw the plans with you.

    3. Permits

      We submit everything to the city and handle any changes they ask for.

    4. Build & Move In

      Our own crews build it. Then it’s yours.

    Financing Options Available

    See ADU and renovation financing options at FinanceMyADU, our partner site.

    Visit FinanceMyADU

    Quick Answers

    What is an ADU?

    An accessory dwelling unit (ADU) is a second, self-contained home on the same lot as your house, with its own entrance, kitchen, and bathroom. It can be a backyard house, an addition, a converted garage, or a converted room (a junior ADU).

    Can I finance an ADU?

    Yes. You can see ADU and renovation financing options at FinanceMyADU, our partner site.

    Do you handle the permits?

    Yes. We draw the plans, submit them to the city, and handle any corrections the city asks for. You never have to go to City Hall.

    How big can an ADU be?

    Under California law, a detached ADU can be up to 1,200 square feet. An attached ADU can be up to half the size of your home, up to 1,200 square feet. We check what your lot and city allow during the free consultation.

    Who builds it, and where do you work?

    Design, permits, and construction are done by Mars Construction Industries Corp, a licensed, bonded, and insured builder (California CSLB #1138550) with its own crews. We work in Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Ventura counties.

    Find Out What Your Property Can Do

    Free consultation, no obligation. Call (949) 787-2662 or request your free estimate.

    Get My Free Estimate

    Serving Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Ventura counties.