Homes with in law suites — Costa Mesa, CA
Last updated: September 24, 2026
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
Homes with in-law suites feature a dedicated area for aging parents or guests, usually with a bedroom and bathroom. You need this if you are managing multi-generational living and want to provide privacy for family members while staying close by. Exact pricing confirmed free on the call.
Frequently asked in Costa Mesa
What is the permit process for an ADU in Costa Mesa?
Are there local ADU resources in Costa Mesa?
What accessory dwelling unit companies serve Costa Mesa?
What does accessory dwelling unit mean?
An accessory dwelling unit, or ADU, is a secondary housing unit on a single-family lot. Think of it as a smaller, independent living space. It can be attached to your main home or a separate structure, like a backyard cottage. ADUs in Costa Mesa are a great way to add rental income or living space for family members.
What are the financing options for accessory dwelling units?
How do I find an ADU company in Costa Mesa?
Where can I find an accessory dwelling unit near me in Costa Mesa?
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, Westside Costa Mesa, The Triangle, South Coast Metro, Fairview Shores — and every surrounding area.
Areas we serve
Browse by state, then city.
California (3)
All of California · Costa Mesa · Jurupa Valley · Santa Maria