Accessory Dwelling Units
ADU Construction in Orange County
Add livable square footage, rental income, or multigenerational space to your property with a fully permitted ADU built by our experienced team.
Accessory dwelling units have become one of the most popular ways for Orange County homeowners to maximize their property value. Whether you envision a detached backyard cottage, a garage conversion, or an attached in-law suite, Main Street Kitchen & Flooring delivers turnkey ADU construction with full permit management.
California's ADU laws have made it easier than ever to add a secondary unit to your lot. Our team stays current on local ordinances across Irvine, Newport Beach, Laguna Niguel, Tustin, and surrounding cities so your project moves forward without delays.
From initial feasibility review through final inspection, we coordinate every trade — framing, electrical, plumbing, HVAC, insulation, drywall, flooring, and finish work — under one contract.
Request an ADU EstimateADU Types We Build
Detached ADU
A standalone structure in your backyard, fully independent from the main home. Ideal for rental income or a private guest suite.
Attached ADU
An addition connected to the primary residence sharing at least one wall. Efficient use of existing foundation and utility connections.
Garage Conversion ADU
Convert an attached or detached garage into a fully permitted living unit. Often the fastest path to an ADU with existing structure.
Above-Garage ADU
Build living space above an existing garage. Maximizes your lot footprint while preserving parking and yard space below.
What Every ADU Includes
Full Kitchen
A complete kitchen with cabinetry, countertops, sink, and appliance connections — not just a kitchenette.
Private Bathroom
A full bathroom with shower or tub, vanity, and toilet. Completely separate from the main home.
Independent HVAC
Separate heating and cooling system so the ADU occupant controls their own comfort and utility costs.
Full Permit & Inspection
Every ADU we build is fully permitted and passes all required inspections for a legal certificate of occupancy.
Quality Flooring
LVP, tile, or carpet installed throughout — the same quality finishes we use in our remodeling projects.
Laundry Connections
Washer and dryer hookups roughed in so the ADU is fully self-sufficient from day one.
ADU FAQs
How long does it take to build an ADU in Orange County?
Most ADU projects take 6–12 months from initial consultation to certificate of occupancy, depending on city permit timelines and project complexity.
What is the maximum size for an ADU in California?
Detached ADUs can be up to 1,200 sq ft. Attached ADUs are limited to 50% of the primary dwelling's square footage, up to 1,200 sq ft.
Do I need to live on the property to build an ADU?
California law removed owner-occupancy requirements for ADUs permitted between 2020 and 2025. Check current local rules with our team for your specific city.
Can I rent out my ADU?
Yes. ADUs can be rented long-term. Short-term rental rules vary by city — we recommend confirming local ordinances before listing on platforms like Airbnb.
Ready to add an ADU to your Orange County property?