Accessory dwelling unit for rent — Costa Mesa, CA
Last updated: September 24, 2026
When you're thinking about adding an accessory dwelling unit (ADU) in Costa Mesa, California, it's easy to confuse it with a simple home addition or remodel. But an ADU is fundamentally different; it's a complete, independent living space. This distinction is important for homeowners here, near Santa Ana and Huntington Beach, who are looking to maximize their property's potential. You might be wondering if building an ADU is a complex undertaking or if it's even feasible on your lot. The truth is, an ADU can be a fantastic way to generate rental income, provide housing for family members, or simply add valuable, flexible space to your Costa Mesa home. It's about creating a functional, long-term asset that enhances your lifestyle and your property's value. This isn't just about adding square footage; it's about adding a smart, livable space. Getting clear, upfront information is the most important step to making your ADU project a success. You're closer than you think to understanding what's possible for your home.
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
About this service
Turning an ADU into a rental means creating a separate, functional living space on your property to generate monthly income. This is a practical choice if you want to offset your mortgage or capitalize on high housing demand in your area. You will need to account for local zoning rules and utility metering. Exact pricing confirmed free on the call.
Frequently asked in Costa Mesa
What does 'accessory dwelling unit' mean in Costa Mesa?
In Costa Mesa, California, an 'accessory dwelling unit' (ADU) is a secondary housing unit on a single-family lot. It's a separate, complete living space with its own kitchen, bathroom, and entrance. Think of it as a guest house, rental unit, or space for family, all within your Costa Mesa property. It adds significant flexibility and value.
Can I get an ADU permit in Costa Mesa?
What are the costs for an ADU in Costa Mesa?
Are there homes with mother-in-law suites in Costa Mesa?
What is the process for ADU construction in Costa Mesa?
How do I find accessory dwelling unit services in Costa Mesa?
What does an ADU builder do in Costa Mesa?
An ADU builder in Costa Mesa, California, is responsible for the design, permitting assistance, and construction of your accessory dwelling unit. They bring expertise in local building codes and construction techniques. A good builder ensures your ADU is built safely, efficiently, and to your satisfaction in Costa Mesa. They are the ones who bring your vision to life.
Also serving nearby: Santa Ana · Huntington Beach · Westminster · Irvine · Garden Grove
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Costa Mesa — population 108,354; about 6,855 residents per square mile across 15.8 sq mi. ZIP codes covered include 92626, 92627, 92628.
Neighborhoods served in Costa Mesa: Mesa del Mar, South Coast Metro, College Park, The Heights, Balboa Peninsula — and every surrounding area.
Areas we serve
Browse by state, then city.
California (3)
All of California · Costa Mesa · Jurupa Valley · Santa Maria