San Diego adopts updated fire and wildfire-interface building rules, including Zone Zero requirements in high-risk areas
What changed and why it matters
San Diego has put into effect a set of updated fire-safety building regulations tied to the 2025 editions of California’s Fire Code and Wildland-Urban Interface Code. The updates align local rules with state standards that cycle every three years and incorporate local amendments approved through city ordinances to be codified in the San Diego Municipal Code.
The changes arrive as California and local governments continue to refine how construction standards, defensible-space practices and ignition-resistant measures are applied in neighborhoods exposed to wind-driven embers and fast-moving brush fires. In San Diego, the policy focus is especially acute because large portions of the city fall within designated Very High Fire Severity Zones.
Zone Zero: a five-foot ember-resistant area for new construction
A central element is the implementation of “Zone Zero,” an ember-resistant zone within five feet of a structure. For San Diego, the requirement applies to new structures permitted in designated Very High Fire Severity Zones beginning February 12, 2026. During plan review, applicants must demonstrate compliance as part of the building-permit process.
Zone Zero is defined as the area within five feet of a structure, including attached decks and stairs, and is intended to reduce the likelihood that embers ignite materials immediately adjacent to buildings.
How property expectations differ for existing homes
The city’s current framework distinguishes between new construction requirements and expectations for existing properties. Existing homeowners and property owners in Very High Fire Severity Zones are directed to work toward Zone Zero compliance by February 2027 as the state requirements phase in.
San Diego Fire-Rescue has emphasized an education-first approach during the transition, pairing guidance with property-specific considerations such as lot configuration, slope and existing site features. The city has also reported ongoing coordination with community partners, including Fire Safe Councils, to support practical implementation.
What compliance looks like on the ground
Zone Zero guidance centers on reducing combustible materials closest to the structure. The city has identified common steps that may be evaluated during permit review for new structures and used as benchmarks for existing-property preparedness.
- Remove dead vegetation, leaf litter, pine needles, mulch, firewood, debris and other combustible materials within five feet of structures.
- Use hardscape or non-combustible ground treatments (such as concrete, gravel, pavers or bare soil) immediately adjacent to buildings.
- Limit combustible items on decks and near exterior walls, including certain outdoor furniture and planters.
- Replace or modify combustible fencing, gates and similar features that can transmit flames to a structure.
- Relocate trash and recycling containers and other combustible storage away from the five-foot zone.
The city has also specified that trees may be allowed within the Zone Zero area if they are maintained and pruned so that branches remain separated from roofs and exterior walls, and canopy growth does not encroach on structures over time.
How the city code updates fit into the broader fire-safety framework
San Diego’s updated regulations sit alongside long-standing defensible-space concepts that extend beyond five feet, recognizing that wildfire risk management combines home-hardening measures with vegetation management and emergency access planning. The city’s local amendments are designed to provide compatibility with the state’s 2025 code editions while allowing adjustments justified by local climatic, topographical and geological conditions.
For residents, the most immediate regulatory impact is for new construction in very high-risk zones beginning Feb. 12, 2026, while the most consequential near-term deadline for existing properties is February 2027.