If you’re considering adding an Accessory Dwelling Unit to your property, one of your first questions is probably: How much does it cost to build an ADU in Los Angeles?
The answer depends on what you’re building. A garage conversion, detached backyard ADU, and larger custom ADU can have very different construction requirements and budgets.
At Concierge Home Remodeling, we help Los Angeles and Orange County homeowners plan, design, permit, and build ADUs based on their property and long-term goals.
What Determines the Cost of an ADU?
The biggest factors affecting ADU construction costs in Los Angeles include the size and type of ADU, existing property conditions, architectural and engineering requirements, utility connections, foundation work, kitchen and bathroom selections, windows, HVAC, and interior finishes.
Site access can also make a major difference. Two identical ADUs built on different properties may have different construction costs because of access, grading, utilities, or structural requirements.
Garage Conversion vs. New Construction ADU
If you already have an underused garage, converting it into an ADU may be worth exploring.
A garage conversion ADU uses an existing structure, but that doesn’t mean the project is simply cosmetic. The garage may require structural work, insulation, plumbing, electrical, HVAC, windows, doors, a kitchen, bathroom, and other improvements before it can function as a residential unit.
A new detached ADU gives homeowners more flexibility over the size, layout, architecture, and placement but requires new construction from the ground up.
Don’t Budget Based on Square Footage Alone
One of the biggest mistakes homeowners make is estimating an ADU solely by multiplying a contractor’s advertised price per square foot.
ADUs contain some of the most expensive parts of a home—particularly the kitchen, bathroom, plumbing, electrical, and HVAC systems—within a relatively small footprint.
Instead, request a detailed proposal showing what is actually included.
Don’t Forget About Design & Permits
Building an ADU in Los Angeles isn’t just a construction project.
Your budget may also need to account for architectural plans, engineering, permits, utility coordination, and other property-specific requirements.
California has continued to streamline qualifying ADU approvals, but projects still need to comply with applicable building and safety requirements.
Is Building an ADU Worth It?
That depends on what you want the space to accomplish.
An ADU can give families more flexibility by creating independent living space for parents, adult children, extended family, guests, or changing household needs.
The biggest advantage is that you’re creating additional usable living space on a property you already own.
Planning an ADU in Los Angeles or Orange County?
Before deciding on a budget, start with the property.
Understanding what can be built—and what it will take to build it—is much more valuable than relying on a generic online construction estimate.
Concierge Home Remodeling helps homeowners throughout Los Angeles and Orange County with ADU design, planning, permitting, garage conversions, and new construction.
Contact our team to schedule a consultation and explore what’s possible with your property.