Design, engineering, permits, and construction, all handled in-house by one licensed team. Earn rental income, keep family close, or finally get the home you want, without the usual contractor headaches.
We’ve got your project details. Our team will call you within 1 business day to talk through your property and next steps.
About Let’s Talk ADU
Let’s Talk ADU helps Southern California homeowners build an accessory dwelling unit (ADU), convert a garage, or remodel. You get one point of contact from your first call to move-in day. Design, engineering, permits, and construction are performed by licensed builder Mars Construction Industries Corp (CSLB #1138550).
Last updated
You’re right to be careful.
Let’s be honest
Most projects stall in the gaps between trades. The plumber waits on the framer, the HVAC crew waits on the electrician, and the homeowner gets stuck in the middle making phone calls. Add confusing city rules and it’s no surprise people hesitate.
An ADU or a major renovation is one of the biggest investments you’ll make in your home. You deserve a builder who gives you straight answers and a real proposal.
MARS Construction Industries holds the A, B, C-36, and C-20 licenses itself, so the handoffs happen inside one company, under one supervisor, on one schedule.
An Accessory Dwelling Unit (ADU) is a self-contained home on the same lot as your main house, with its own entrance, kitchen, and bathroom. MARS has designed, permitted, and built 100+ of them across Southern California in the last four years. The right type depends on your lot, your budget, and how you plan to use it.
A fully independent home in your backyard.
Standalone backyard homes, from compact one-bedrooms to full two-bedroom houses. Foundation to finishes and utilities to landscaping tie-in, all in-house.
More space, connected to your home.
An addition built as its own unit, with a new bedroom, bath, kitchen, and entry tied into your home. One team builds the addition and the unit together, so nothing falls between two scopes.
Your fastest path to a rentable unit.
Usually the fastest path to a second unit. We handle design, structural, plumbing, electrical coordination, HVAC, insulation, and finishes, turning dead garage space into a real home.
Build up, not out, and keep your yard.
Second-story units take real structural and engineering work, which is exactly what our A and B license classifications are for.
One contract, one team, no colliding scopes.
An ADU is often one piece of a bigger project: a remodel, an addition, or a ground-up home. In Altadena, MARS built a new home and ADU from the foundation up.
Turn existing space into its own unit.
Usually a bedroom converted into a compact unit with its own entrance, a kitchenette, and a bath. It stays inside your existing footprint, so it’s often the lowest-cost path to a legal second unit.
Renovations
Kitchens, baths, additions, and whole-home remodels, with the plumbing and HVAC inside the walls done by MARS’s own licensed crews instead of handed off.
Layouts that work, built to last.
From quick refresh to full gut.
Modernize every room, one team.
More space without moving.
Design, engineering, submittal, and corrections. The people answering the city’s questions are the people who drew the plans.
The designers and the builders are one team, so the plan is made to be built, not just to look good on paper.
Foundation, framing, plumbing (C-36), HVAC (C-20), insulation, and finishes, including new sewer work under the A license.
Every city’s permit process has its own personality. MARS has learned most of them the practical way, one approval at a time.
111 five-star reviews, and a team that stays with your project through the last inspection signature.
A well-built ADU or garage conversion is one of the smartest ways to add value to a California property.
Step 1
We walk your property, talk through your goals, and give you an honest read on what your lot and your city will allow.
Step 2
Layout, engineering, and a real written proposal covering the full scope, drawn by the team that will build it.
Step 3
We submit the plans and manage corrections with the city. You never set foot in City Hall.
Step 4
One supervisor runs the project from foundation or garage demo to final finishes. No handoff to a builder seeing the plans for the first time.
Step 5
We walk the finished unit with you, close the punch list, and hand over a permitted home that’s ready to live in.
Where we build
From garage conversions in Irvine and Anaheim to backyard homes from Huntington Beach to Pasadena, plus ground-up work like the Altadena new home and ADU.
Common questions
An accessory dwelling unit (ADU) is a self-contained home on the same lot as your main house, with its own entrance, kitchen, and bathroom. ADUs can be detached backyard homes, attached additions, garage conversions, or second-story units.
We build detached ADUs, attached ADUs, garage conversions, second-story ADUs, and junior ADUs (JADUs). An ADU can also be combined with a remodel, an addition, or a ground-up new home under one contract.
It depends on your lot, your garage, and what you want the finished home to be. A garage conversion is usually the fastest path to a second unit, while a detached build gives you a true standalone house. We compare both options for your property.
Yes. Design, engineering, permit submittals, and city corrections are handled in-house by our licensed builder, so the people answering the city’s questions are the people who drew the plans.
A junior ADU is carved out of your existing house, typically a bedroom converted into a compact unit with its own entrance, a kitchenette, and a bathroom. Because it stays inside the existing footprint, it is often the lowest-cost path to a legal second unit.
Yes. An ADU is often one piece of a remodel, an addition, or a ground-up build. One contract and one team keep the scopes from colliding, as on the Altadena project where a new home and ADU were built from the foundation up.
We serve Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Ventura counties in Southern California, with recent work ranging from Irvine and Anaheim to Huntington Beach and Pasadena.
Yes. Mars Construction Industries Corp holds California CSLB license #1138550 with A (General Engineering), B (General Building), C-36 (Plumbing), and C-20 (HVAC) classifications, and is licensed, bonded, and insured.
You have one point of contact, from your first property walk through move-in day. Mars Construction Industries’ own crews and one supervisor run the design, permits, and construction.
Request a free consultation with the form at the top of this page or call (949) 787-2662. We walk your property, talk through your goals, and give you an honest read on what your lot and your city will allow.
What homeowners say about working with MARS.
★★★★★
“Replace this with a real review from a happy ADU client. Mention the project type and the person they worked with.”
— Client name · Google review
★★★★★
“Replace this with a real review about a garage conversion or remodel. Short, specific quotes work best.”
— Client name · Yelp review
★★★★★
“Replace this with a real review that mentions permits, timeline, or staying on budget.”
— Client name · Houzz review
Swipe to read more reviews →
Every ADU starts with a conversation about your property, your goals, and the honest math. Call (949) 787-2662 or request your free consultation.
Check My Property’s ADU Eligibility, It’s FreeServing Los Angeles, Orange, Riverside, San Bernardino, San Diego, and Ventura counties from our home base in Orange, CA.