Building an ADU in Hermosa Beach requires navigating one of the most constrained land use environments in the South Bay. Hermosa Beach is built out nearly to its edges — lots are small, setbacks are tight, and neighbors are close. But the rental market is exceptional: a garage conversion ADU two blocks from the beach can rent for $2,800–$4,200/month, making the ROI on a Hermosa Beach ADU one of the strongest in Los Angeles County. APLA Construction (CA Lic #1136359) handles ADU projects in Hermosa Beach, evaluating each property individually to identify the feasible ADU path.
Most Hermosa Beach properties have a detached or attached garage that can be converted to an ADU. Garage conversions do not require new lot coverage and are the most feasible ADU path on small Hermosa Beach lots.
A Junior ADU (JADU) converts a portion of the existing home (typically a master bedroom or bedroom suite with existing bathroom) into a separate unit with its own entrance. JADUs are limited to 500 sq ft and are the most affordable ADU option.
On most Hermosa Beach lots, there is limited or no room for a new detached ADU in addition to the main home and garage. Some larger corner lots or properties where the garage was already demolished may have room. APLA evaluates each property individually.
Hermosa Beach has its own Community Development Department at 1315 Valley Drive. ADU permits in Hermosa Beach do not go through LADBS. Hermosa Beach is also in the California Coastal Zone — properties near the beach may require a Coastal Development Permit (CDP) in addition to a building permit for new construction, including ADUs. APLA manages all Hermosa Beach permit submissions and CDP applications as required.
Yes, but lot size constraints mean garage conversions and JADUs are the most feasible options. APLA provides free ADU feasibility assessments to determine what ADU type is possible and economically worthwhile on your specific Hermosa Beach property.
A garage conversion ADU costs $90,000–$162,000. A JADU costs $55,000–$95,000. A new detached ADU (where feasible) costs $165,000–$285,000. All costs include City of Hermosa Beach permit fees.
It depends on the location. Properties within the City of Hermosa Beach Coastal Zone may need a CDP for new construction. Garage conversions and JADUs within the existing building footprint typically do not require a CDP. APLA advises on Coastal Zone requirements for your specific property address.
A garage conversion ADU costing $125,000 generating $3,200/month in rent produces $38,400/year in income — a 30% annual cash-on-cash return before expenses. Even after accounting for vacancy, insurance, and maintenance, Hermosa Beach ADUs are among the highest-returning ADU investments in Southern California.
Call: (818) 818-4419
Email: info@aplaconstruction.com
CA General Contractor License #1136359
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