ADU construction across Costa Mesa neighborhoods.

Start with the City’s recognized neighborhood map.

Costa Mesa’s official neighborhood exhibit identifies established areas such as Eastside, Westside, Mesa Verde, College Park, Halecrest, Mesa del Mar, and several smaller districts. We use those names to organize information, then verify the actual parcel and proposed work.

Browse the neighborhood list below to see which site issues commonly deserve an early look. These pages do not certify eligibility, boundaries, or approval. They help a homeowner prepare for a useful property conversation.

Housing type matters more than a ZIP code.

A detached house with a broad side yard presents a different construction route from a condominium or a small-lot home. Alley access can help one project and complicate another. Mature landscaping, old additions, detached garages, and shared property conditions can all change what the team needs to investigate.

That is why our location pages discuss real site conditions rather than repeating a citywide sales pitch. Each guide connects the neighborhood context to the four ADU services, permit questions, cost planning, and direct phone contact.

We keep the service territory clear.

This website is focused on Costa Mesa. The neighborhood pages are all within the city and are supported by City planning documents. We do not use a list of distant cities to make the company appear larger.

If the property is close to a boundary, begin with the jurisdiction shown in the assessor and City records. The responsible permit authority, address, and parcel facts must match the project documents.

Check the local source, then check the lot.

See the City’s official neighborhood exhibit and General Plan land-use discussion. Those sources describe neighborhood patterns, not individual build rights.

For ADU requirements, use the City ADU resource and the California HCD ADU page together.

Bring the neighborhood and property together.

Choose the neighborhood guide that best matches the address. Then gather photos of the proposed work area, the access route, the main electrical panel, the garage if involved, and any visible utility cleanouts.

Call (949) 503-8004 or review the Costa Mesa estimate checklist. The homepage links the service, process, costs, and local resources in one place.

Choose a Costa Mesa neighborhood guide.