Defensible Space for San Diego Homeowners: The Zones and Distances Explained
Defensible space is the buffer you create between a home and the plants and objects around it so a wildfire has less to burn near the house. CAL FIRE says 100 feet of defensible space is required by law, and it breaks that area into three zones: 0 to 5 feet, within 30 feet and within 100 feet or the property line.
The short answer
- CAL FIRE cites Public Resources Code 4291 for the 100 feet of defensible space required by law.
- Zone 0 is the first 5 feet from the house. Zone 1 reaches 30 feet. Zone 2 reaches 100 feet or the property line.
- Some counties set stricter rules, and CAL FIRE gives San Diego County as an example, so confirm distances with your local fire department.
- Defensible space also supports a Safer from Wildfires insurance discount.
The three zones
| Zone | Distance from the house | What CAL FIRE says to do |
|---|---|---|
| Zone 0 | 0 to 5 feet | Use hardscape instead of combustible mulch, clear dead plants and debris and keep branches at least 10 feet from any chimney or stovepipe outlet. |
| Zone 1 | Within 30 feet | Remove dead plants, grass, weeds and dry leaves or pine needles. Trim trees so branches are at least 10 feet from other trees. |
| Zone 2 | Within 100 feet or the property line | Mow annual grass to 4 inches or less, and keep 10 feet of clearance around exposed wood piles. |
Zone 0 is the area closest to the house, so it is the first place I would look when I walk a property. Bark, wood chips and dead plants right against the wall are easy to fix.
Spacing rules for trees and shrubs
CAL FIRE gives specific spacing so fire has a harder time moving from plant to plant. These are the numbers from its page:
| Item | Spacing |
|---|---|
| Lowest tree branches | At least 6 feet above the ground |
| Shrub to tree, vertical | At least 3 times the shrub's height |
| Shrub to shrub, slope under 20% | 2 times the shrub's height |
| Shrub to shrub, slope 20% to 40% | 4 times the shrub's height |
| Shrub to shrub, slope over 40% | 6 times the shrub's height |
| Tree to tree, slope under 20% | 10 feet |
| Tree to tree, slope 20% to 40% | 20 feet |
| Tree to tree, slope over 40% | 30 feet |
Other items around the house
- Keep 10 feet of clearance to bare mineral soil around exposed wood piles.
- Keep 10 feet of clearance around outbuildings and propane tanks, plus another 10 feet with no flammable vegetation beyond that.
- Fallen leaves and similar debris may be allowed to a depth of 3 inches in Zone 2.
Local rules can be stricter
CAL FIRE says 100 feet is the legal requirement, and it notes that some counties have stricter rules. It names San Diego County as an example with a 50-foot Zone 1. Your fire district decides what applies to your address, so call them or check their site before you start, especially if your lot is on a slope or on the edge of open land.
Inspections and selling a home
CAL FIRE and its partners inspect defensible space in State Responsibility Areas, and homeowners can request a real estate inspection through a form on CAL FIRE's page. The page does not say that an inspection is required when a property is sold, so ask your agent or fire district what applies to your address. If you plan to list, clearing Zone 0 and Zone 1 early is a low-cost task that buyers and insurers can see right away.
Insurers also care. Completing defensible space is one of the actions in the Safer from Wildfires discount list, and it matters if you ever need to apply to the FAIR Plan.
What this guide cannot promise
I am not a fire official, and the rules differ by property and area. Treat these numbers as CAL FIRE's general guidance, not a ruling on your lot. Your local fire department can tell you what applies to your address.
My advice for San Diego buyers
- Start with Zone 0, since the first 5 feet are quick to clear.
- Call your local fire department to confirm the distances that apply to your address.
- Trim trees so the lowest branches are at least 6 feet off the ground.
- Keep wood piles, outbuildings and propane tanks at the recommended distances.
- Take dated photos of the finished work for your insurer.
A note on advice
I am a REALTOR®, not an insurance agent, attorney or financial advisor, so this guide is general information. A licensed insurance agent or broker can tell you what coverage and prices apply to a specific home.
Call or text me at (619) 402-4614 or send me a message.
Call or text (619) 402-4614Contact Trevor LandressRelated guides
- California FAIR Plan in San Diego: What It Covers and When Buyers Use It
- Wildfire Safety Discounts for San Diego Homeowners: The 10 Actions That Can Lower Your Premium
- Homeowners Insurance Nonrenewal in California: What Happens If Your Insurer Drops You
- Earthquake Insurance for San Diego Homeowners: What It Covers and How Deductibles Work
- How Much Are Closing Costs When Buying a Home in San Diego?
- What Are the Steps to Buying a Home in San Diego?
Frequently asked questions
How much defensible space does California require?
CAL FIRE says 100 feet of defensible space is required by law, citing Public Resources Code 4291.
What is Zone 0?
Zone 0 is the area from 0 to 5 feet from the home. Use hardscape instead of combustible mulch and clear dead plants and debris.
Do local rules differ from the state rule?
They can. CAL FIRE notes that some counties are stricter, and it gives San Diego County as an example with 50 feet for Zone 1. Check with your local fire department.
How far should the lowest tree branches be from the ground?
CAL FIRE says at least 6 feet above the ground.
Can defensible space lower my insurance cost?
Following defensible space requirements is one of the 10 actions in the Safer from Wildfires framework, and every action qualifies for a discount.
About the author
Trevor Landress is a San Diego REALTOR® with Coldwell Banker West (DRE# 02126901). He was born and raised in San Diego and has been licensed since 2021.
Trevor helps homeowners sell, guides first-time buyers through the home buying process and assists investors with their next acquisition. His work includes negotiating offers, analyzing market trends, building pricing strategies and running marketing campaigns for his listings.
He serves clients across San Diego County, from coastal communities like La Jolla, Del Mar and Carlsbad to neighborhoods inland.
Trevor is part of the Campbell Group, a three-generation real estate team, and he and the Campbell Group consistently rank as a top producing team at Coldwell Banker West each month. He writes these guides to help San Diego buyers and sellers navigate an ever-changing market. To talk through your plans, call or text (619) 402-4614 or contact Trevor Landress.
How I help San Diego home buyers
I help buyers sort out their budget, understand their loan options with a lender, search for homes, write and negotiate offers, keep track of inspection and contingency deadlines and stay organized through closing.
How I help San Diego home sellers
I help sellers price their home, prepare it for the market, market it to buyers, review and negotiate offers and manage the steps from an accepted offer to closing.
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