Rancho Bernardo, Rancho Peñasquitos and Black Mountain Ranch are City of San Diego community plan areas, and Del Sur is the northern part of Black Mountain Ranch. 4S Ranch is unincorporated County land, and the County's 4S Ranch Specific Plan can add standards of its own; confirm those with County PDS.
| Rule | City of San DiegoRancho Bernardo, Rancho Peñasquitos, Black Mountain Ranch, Del Sur | County4S Ranch |
|---|---|---|
| Front yard | 3 ft solid at the lineSolid: 3 ft at the front or street-side property line, rising to 6 ft at the setback line. Open (at least 35% open to light): 6 ft, rising to 9.Source: SDMC § 142.0310(c) | 42 inSolid or open, in the front and exterior side yards, as the general rule.Source: County Zoning Ordinance § 6708 |
| Side and rear | 9 ft, open above 6In required side and rear yards; 10 ft outside the required yards. Height is measured from the lowest adjacent grade.Source: SDMC § 142.0310(d)–(e) · § 113.0270 | 72 inIn rear and interior side yards.Source: § 6708 |
| Building permit | 7 ft or tallerThe building code exempts fences “7 feet in height or less,” so confirm an exactly 7-ft fence with Development Services.Source: Table 142-03A · SDMC § 129.0203 | Over 6 ftFences and freestanding masonry walls up to 6 ft are exempt if they meet zoning.Source: PDS 110 · PDS 070 |
| Retaining wall | Over 3 ft, or any surchargeA wall over 3 ft from the top of the footing needs a permit, and so does a lower wall carrying a surcharge; Development Services counts a fence on top as one.Source: SDMC § 129.0203 · IB 220 | 3 ft of soilExempt only if it retains 3 ft of soil or less, stands 6 ft or less overall, has level backfill and holds no surcharge.Source: PDS 110 |
| Pool barrier | 60 inState enclosure rules apply: at least 60 in, gates that open away from the pool, self-close and self-latch. An exit alarm plus an in-pool alarm don't count as the two required features.Source: HSC § 115923 · SDMC § 145.3102 | Permanent, from neighborsA permanent enclosure separating the pool from neighboring properties, 60 in measured away from the pool, with the latch at least 54 in above the bottom of the gate.Source: PDS 379 |
| Zone 0 | In force on Very High lotsNew homes and additions applying for permits since February 28, 2026: new fences and gates in Zone 0 must be noncombustible, with a 5-ft noncombustible span where a fence attaches. Existing fences attached perpendicular to the house need the same span.Source: SDMC § 512.0604 · Standard D-2 · Existing-structure guidelines | Hardscape or noncombustibleThe 5 ft around a building must be continuous hardscape or noncombustible materials.Source: County WUI Code § 604.12.1 |
The state's Zone 0 package was withdrawn from review on September 8, 2026 and is not in effect. Tiers, materials and exceptions are in City of San Diego fence rules and unincorporated County fence rules in our county guide; the City or County decides what a project needs.
On City lots with native or naturalized vegetation within 100 ft of a structure, brush management applies, and fences and walls inside the 35-ft Zone One must be noncombustible, one-hour fire-rated or Type IV heavy timber (SDMC § 142.0412). A rear fence at a canyon edge can fall inside it.
A fence on a retaining wall is measured from grade on the high side. In a front yard, two retaining walls of up to 3 ft each are allowed if they're separated by at least the upper wall's height, with an open fence of up to 3 ft 6 in on top (SDMC § 113.0270, § 142.0340).
Much of 4S Ranch, Del Sur, Rancho Bernardo and Rancho Peñasquitos was built as planned communities. Where an HOA applies, its design review sits on top of the City's or County's rules.
Manual gates only: we don't build driveway, electric or automated gates. Horse fencing in steel pipe rail and no-climb mesh, where zoning allows animals.
A typical project moves through five steps. The City or County, and an HOA where one applies, have the final say on approvals.
We walk the lot with you: which code applies, grade, the canyon edge, the pool path and where the fence meets the house.
Heights, materials, finish, hardware and gate swings by segment.
Panels and gates made in our Escondido shop, a short drive north.
Posts set to grade, panels installed, gates hung and adjusted.
We walk the finished work with you.
A San Diego mailing address doesn't settle it; City Development Services or County Planning & Development Services can confirm a parcel.
Plan on one. The City's building-permit exemption covers fences other than swimming pool barriers, and the County's 6-ft exemption excludes pool barriers too, so a fence that serves as the pool barrier goes through permit and inspection (SDMC § 129.0203; PDS 110).
Fire-Rescue says owners aren't required to act yet: enforcement begins on or after February 28, 2027, and owners should attempt full compliance, including replacing noncompliant fences and gates, by February 28, 2029. Fences outside Zone 0 have no new requirements. In 4S Ranch the County code states no phase-in, so ask the fire district.
In the City, a Neighborhood Development Permit can allow up to 20% more, on findings about grade, neighborhood pattern or safety (SDMC § 142.0350). In the County, an administrative exception can allow a 7 ft 6 in fence in an interior side yard, or in a rear yard that doesn't abut a street, private road or alley, with written consent from all contiguous owners (§ 6708).
Each neighbor works under its own code.
Send the address and what the fence has to do. We'll walk the lot with you, note which code applies, then write up the scope.
Most site reviews and estimates are free; we confirm before booking.
Prefer to talk it through first? Call (619) 975-1883, weekdays 8am to 6pm.