San Mateo County, CA Swimming Pools & Spas: Above-Ground Pools (2026)

The County's permitting materials list swimming pools among the projects that require a building permit and a boundary survey in unincorporated San Mateo County, and the County does not carve out a separate, lighter category for above-ground pools in its published pool/spa permit guidance. Applicants follow the same Pool or Spa Permit process - plot plans, construction details, engineering and energy data, and payment of building, plan-check, plumbing and electrical fees - administered by the Planning and Building Department under Title 10. For drowning prevention, the California Swimming Pool Safety Act applies. An above-ground pool's own wall can count toward a barrier only if it satisfies the state standard: a qualifying enclosure must be at least 60 inches high, block a 4-inch sphere, and have gates that are self-closing and self-latching opening away from the pool with the latch at least 60 inches high (HSC 115923). Where a ladder or steps provide access over a pool wall, additional barriers or removable/lockable access are typically needed so the installation provides at least two of the seven approved safety features under HSC 115922. Electrical bonding and grounding for pumps and filters is also reviewed under the adopted electrical code. Owners should confirm setbacks and any height/Fence-Height-Exception issues with Planning and Building before installing.