Before You Build in Fullerton, CA: Permit & Rule Checklist (2026)

Fullerton enforces California Building Code pool barrier requirements. All residential pools and spas must be enclosed by a barrier at least 60 inches high with self-closing, self-latching gates. Multiple layers of protection are required for new construction.

Fullerton requires building permits for retaining walls over 4 feet in height (measured from the bottom of the footing to the top of the wall). Walls over 4 feet also require engineered plans. Retaining walls combined with fences have combined height limits.

Fullerton Municipal Code 15.17.050 caps fences and walls in the front yard setback at 36 inches and along side and rear yards at 6 feet. Non-view-obscuring fences may go to 6 feet in setbacks with Director of Development Services approval.

Under Fullerton Municipal Code 14.04.050, masonry or concrete fences three feet or shorter and all other fences six feet or shorter are exempt from building permits. Taller fences and most retaining walls still require a permit and zoning review.

Fullerton defers to California Civil Code Sections 841-841.4 (Good Neighbor Fence Act) for shared boundary fence disputes. Adjoining property owners share equal responsibility for maintaining a reasonable boundary fence. The city does not mediate private fence disputes but enforces zoning compliance.

Above-ground pools in Fullerton with a water depth of 18 inches or more are subject to barrier requirements under California Building Code Section 3109. Pools exceeding certain size thresholds may require a building permit. Inflatable and temporary pools under 18 inches deep are exempt from barrier requirements but must still be supervised. All above-ground pools must meet setback requirements and may not be placed in required setback areas.

Hot tubs and spas in Fullerton are subject to barrier requirements when water depth exceeds 18 inches, consistent with California Building Code Section 3109. Electrical permits are required for hardwired spa installations. Spas must meet setback requirements, and covers with locking mechanisms may satisfy certain barrier requirements. Equipment noise must comply with residential noise limits.

Every new or remodeled swimming pool or spa in Fullerton requires a building permit from the Community and Economic Development Department - Building & Safety Division, and plans must comply with the 2022 California Residential Code (including Appendix AX - Swimming Pool Safety Act) as locally amended by FMC chapter 14.04.

Fullerton has locally amended California's Swimming Pool Safety Act through FMC 14.04.150 and 14.04.160, requiring every new or remodeled single-family pool or spa to have a 60-inch isolation enclosure (mandatory) PLUS at least one additional drowning-prevention feature - a stricter standard than the state default, which only requires any two of seven features.

Fullerton enforces California's comprehensive residential pool safety laws including anti-entrapment drain requirements (Virginia Graeme Baker Act compliance), barrier standards, and supplemental safety features. Pool drain covers must be ASME/ANSI compliant. Pools with a single main drain must have a safety vacuum release system (SVRS). All pools must maintain water clarity sufficient to see the main drain from the deck.

Fullerton permits ADUs and Junior ADUs (JADUs) in compliance with California Government Code Sections 65852.2 and 65852.22. One ADU and one JADU are allowed on any single-family lot. ADUs up to 800 square feet with a 4-foot rear and side setback are approved ministerially without discretionary review. No owner-occupancy requirement applies to ADUs (JADUs require owner occupancy). No parking is required if within half a mile of transit.

Fullerton permits garage conversions to ADUs under FMC Section 15.17.100. Conversions of legally established garages are exempt from setback requirements. No replacement parking is required for the primary dwelling when converting a garage.

Fullerton allows tiny houses only as a permanent ADU on a foundation under FMC 15.17.100, consistent with California Government Code 65852.2 and California Residential Code Appendix AX. Movable tiny houses on wheels (THOWs) registered as recreational vehicles cannot serve as a permanent dwelling on residential lots.

Fullerton Municipal Code section 15.17.050 treats carports and patio covers as accessory structures. Non-enclosed covers attached or freestanding from a residence must sit at least 5 feet from any rear property line and 3 feet from any side line abutting a residential lot. A Building and Safety permit is required.

Fullerton regulates accessory structures through residential development standards in FMC Title 15. Small sheds under 120 square feet may be exempt from building permits but must comply with zoning setbacks. Larger structures require permits.

Open burning of vegetation, yard waste, and trash is effectively prohibited in Fullerton under South Coast AQMD Rule 444 and Fullerton Municipal Code § 13.20.150. Only contained recreational fires meeting fuel, distance, supervision, and wind conditions are allowed, and SCAQMD no-burn alerts override even those.

Fullerton allows permanent or portable barbecues, gas outdoor fireplaces, fire pits, fire rings, and gas grills at one- and two-family dwellings, but only when located at least 30 feet from grass, grain, brush, or forest-covered areas and away from the city's fuel modification areas.

Fullerton protects its urban tree canopy through tree preservation policies that may require permits for removing significant trees on private property. Removing or damaging city-owned street and parkway trees without authorization is strictly prohibited. Heritage-sized trees — generally those with trunk diameters exceeding certain thresholds — receive heightened protection and may require a tree removal permit with replacement planting conditions.

Under Fullerton Municipal Code Chapter 9.06, property owners are NOT responsible for trimming street trees in the parkway - the City prunes, removes, and plants them through its contractor (West Coast Arborists). It is unlawful for any person to alter, prune, or remove a street tree in the public right-of-way without a permit from the Public Works / Maintenance Services Department, and violators may be fined and required to pay the replacement value of the tree.

Fullerton's Drought Ordinance 3299 and Fullerton Municipal Code (FMC) Chapter 15.50 (Landscaping and Irrigation Requirements) prohibit watering between 9:00 a.m. and 6:00 p.m., ban watering within 48 hours of measurable rain (1/4 inch), and limit non-attended overhead watering to 15 minutes per valve per day. At the City's current Conservation Level 2, landscape irrigation is restricted to two assigned days per week by address (odd / even) and must occur outside 9 a.m.-6 p.m.