All ADU Regulations

Hermosa Beach, California

Hermosa Beach has updated its ADU ordinance to comply with new state laws. Below are the up-to-date requirements for permitting an ADU in Hermosa Beach

July 27, 2022
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Hermosa Beach

Hermosa Beach is a great place to build an ADU. The weather is perfect for it, and the beach is right there. There are plenty of places to build an ADU in the city, with great opportunities for coastal casitas or granny flats. Here at Cottage we help you build your dream ADU.


All properties zoned for single family and multifamily use may be eligible to build ADUs.

Number of units

The number of ADUs you’re able to build depends on how your lot is zoned:

  • Lots zoned for single family use may add 1 ADU and 1 Jr. ADU (JADU).
  • Lots zoned for multi-family may add 2 new detached ADUs and at least one conversion ADU (interior conversion of existing building, but no more than 25% of the original number of units. (E.g. an apartment with 4 units may add 2 detached ADUs and 1 conversion ADU.)

Building size

  • The maximum size is 500.0 sq. ft. for a JADU
  • 850 sq. ft. max for a detached ADU
  • Attached ADU Max Size: Greater of 850sf or 50% of main dwelling

Building height

  • Building height detached ADU: 16'
  • Building height attached ADU: Shall not exceed the height as permitted in the base zone


State Law - No requirements for parking if any of the following true:

  • The accessory dwelling unit is located within one-half mile walking distance of public transit.
  • The accessory dwelling unit is located within an architecturally and historically significant historic district.
  • The accessory dwelling unit is part of the proposed or existing primary residence or an accessory structure.
  • When on-street parking permits are required but not offered to the occupant of the accessory dwelling unit.
  • When there is a car share vehicle located within one block of the accessory dwelling unit.

Design and build with confidence.