Before You Build in Los Angeles County, CA: Permit & Rule Checklist (2026)

Fences under 6 ft do not require a building permit in unincorporated LA County. Fences over 6 ft require permits from Building & Safety. Department of Regional Planning approval may be needed depending on fence location (front yard, corner lot). Block walls over 6 ft always require permits.

CA Good Neighbor Fence Act (Civil Code 841) applies in unincorporated LA County. Adjoining property owners share boundary fence costs equally. The spite fence doctrine (CC 841.4) applies to fences over 10 ft built to annoy neighbors. Hedges serving as fences are subject to the same height restrictions.

Retaining walls in unincorporated LA County under 4 ft from footing to top are exempt from building permits unless supporting a surcharge. Walls in required yards cannot exceed 6 ft. In coastal areas, retaining walls must be terraced and landscaped with native species before the rainy season (Oct 15-Apr 15).

Pool barriers in unincorporated LA County must comply with CA Building Code Title 24 Chapter 31. Minimum 60-inch barrier height with self-closing, self-latching gates. At least one additional safety feature required. LA County Building & Safety inspects compliance.

LA County Title 22 zoning code limits fences in unincorporated areas to 42 inches in front yards and 6 feet in side and rear yards. Fences under 6 feet generally do not require a building permit but may need Regional Planning approval.

Hot tubs and spas in unincorporated LA County require building permits for permanent installations from LA County Building & Safety. GFCI protection mandatory. Safety covers required when not in use. May require barrier depending on design and accessibility.

Pool safety in unincorporated LA County is governed by CA HSC 115920-115929 and CA Title 24. Barriers, drain covers, and at least one additional safety feature are mandatory. Vacant properties must drain pools. LA County Building & Safety enforces all pool safety requirements.

Pool fencing in unincorporated LA County must meet CA Title 24 Chapter 31 standards. Minimum 60-inch barrier height, self-closing and self-latching gates, plus one additional safety feature per the Swimming Pool Safety Act. LA County Building & Safety inspects for compliance.

Building permits for pools in unincorporated LA County are required from LA County Building & Safety for pools holding 3,000+ gallons. Plan check and multiple inspections required. Compliance with CA Title 24 pool safety standards is mandatory. Separate electrical and plumbing permits needed.

Above-ground pools in unincorporated LA County holding 3,000+ gallons require a building permit from LA County Building & Safety. All barrier requirements (60-inch fencing, self-closing gates) apply equally. Smaller inflatable pools may be exempt from permits but not safety requirements.

LA County's ADU Ordinance (amended October 2024) allows accessory dwelling units in all residential zones of unincorporated areas. Applications go through EPIC-LA and are reviewed by the Department of Regional Planning. Pre-approved plans are available.

LA County allows converting existing garages to ADUs or JADUs in unincorporated areas under the ADU Ordinance. Garage conversions are the most affordable ADU option at roughly $80–$150K. Replacement parking is not required by state law.

Carports in unincorporated LA County require building permits and must comply with Title 22 zoning setbacks for the applicable zone. Detached carports are treated as accessory structures subject to rear and side yard requirements. Open carport designs may have modified setback allowances.

Small accessory structures under 120 square feet in unincorporated LA County generally do not require a building permit. Larger structures must comply with Title 26 building code and Title 22 zoning setbacks.

Tiny homes on permanent foundations are treated as ADUs under CA Gov Code 65852.2 and LA County's ADU ordinance in unincorporated areas. Tiny homes on wheels are not recognized as permanent dwellings. LA County allows ADUs up to 1,200 sq ft detached with 4 ft side/rear setbacks.

Recreational fire pits in unincorporated LA County must comply with South Coast AQMD regulations and LA County Fire Department rules. Open burning requires AQMD approval. Gas/propane fire pits are generally allowed. Wood-burning is restricted on spare-the-air days.

Open burning is prohibited in unincorporated LA County except by permit from the LA County Fire Department. The South Coast Air Quality Management District Rule 444 further restricts open burning. Wildfire risk areas have additional prohibitions.

LA County Code Title 22, Chapter 22.174 protects oak trees in unincorporated areas. Removing, damaging, or encroaching on any oak tree 8 inches or more in diameter requires an Oak Tree Permit from the Department of Regional Planning.

Tree trimming in unincorporated LA County is generally unrestricted for private property, except for protected oak trees. Any cutting or pruning of oak trees 8+ inches diameter requires an Oak Tree Permit under Chapter 22.174. Street trees are managed by county public works.

Water use in unincorporated LA County is governed by various water districts and state conservation mandates. LADWP and other districts impose watering schedules during drought. AB 1572 bans irrigating non-functional turf with potable water for commercial properties.