#1 ADU Contractor in Manhattan Beach
Custom Builds by Horizon Remodeling

Finding the right adu contractor in Manhattan Beach means working with a team that understands both state law and the specific physical realities of a city built out on narrow beach town lots over a century ago. California consolidated its ADU statutes into Government Code sections 66310 through 66342 in 2024, and those rules changed again on January 1, 2026. Square footage is now measured as interior livable space. Once you submit an application, the reviewing agency has 15 business days to determine whether it is complete and 60 days to approve or deny it. Approval is ministerial, meaning no public hearing and no discretionary design review.

In Manhattan Beach, that application goes to the City of Manhattan Beach Community Development Department Building and Safety Division, not a county office. That distinction matters because Los Angeles County contains 88 incorporated cities, and the agency receiving your paperwork changes from one city to the next even when the underlying state rules do not. The county’s own ADU ordinance, amended in July 2025, was found non-compliant with state law by the California Department of Housing and Community Development in December 2025. Among other findings, it caps detached ADUs on a multifamily lot at two where state law allows up to eight. That ordinance covers unincorporated territory rather than incorporated cities like Manhattan Beach, but it is a useful reminder that a local handout is not always current with the statute.

State law does set a floor of protections that applies regardless of where a parcel sits. A local agency cannot cap an ADU below 850 square feet of interior livable space, or below 1,000 square feet for a unit with more than one bedroom. Side and rear setbacks cannot exceed four feet. Owner-occupancy cannot be required. Building an ADU cannot trigger a fire sprinkler retrofit of the main house. There are no impact fees on a unit of 750 square feet or less.

The lot decides most of the practical questions once the legal framework is clear. Manhattan Beach was platted in the early 1900s and built out from its 1912 incorporation onward after the natural sand dunes were leveled during the 1920s and 1930s. The result is a city of narrow beach town lots where homes stack vertically, with kitchens frequently sitting on an upper level rather than at grade. That vertical layout shapes how far utility lines have to run to reach a new detached unit and whether a garage conversion or a new freestanding build is the more workable answer on a given parcel.

Access adds another layer of planning, particularly in the Sand Section, where many blocks front walk streets and alleys rather than conventional driveways. That configuration constrains material staging, equipment movement and parking during construction in ways that a standard suburban job site does not. We walk every parcel before drawing anything, checking setbacks, grade changes, equipment access and utility routes so that the plan we bring to the Building and Safety Division reflects what the site can actually support.