Austin, TX Environmental Rules: Defensible Space (2026)
Key Facts
- Zone A clearance
- 100 feet fuel-modification distance
- Zone B clearance
- 50 feet fuel-modification distance
- Zone C clearance
- 30 feet minimum, or to lot line
- Ember Ignition Zone
- 5 feet from roof overhang, noncombustible
- Responsible party
- Owner, lessee or property controller
- Effective
- July 10, 2025 local amendment
Summary
Every structure in Austin's mapped wildland-urban interface must clear a fuel-modification buffer set by its Proximity Zone, from 30 feet in Zone C up to 100 feet in Zone A, plus a five-foot noncombustible Ember Ignition Zone hugging the building itself, under Sections 603.2 and 603.2.1 of the local Wildland-Urban Interface Code.
603.2 Fuel modification. When required, buildings or structures within the wildland-urban interface shall comply with the fuel modification distances contained in Table 603.2. For all purposes the fuel modification distance shall be not less than 30 feet (9144 mm) or to the lot line, whichever is less. ... Table 603.2 Required Defensible Space: Proximity Zone C 30 feet; Proximity Zone B 50 feet; Proximity Zone A 100 feet (or to the property line, whichever is less). ... 603.2.1 Ember Ignition Zone (EIZ). An area of five feet measured from the edge of the roof overhang that extends around the entire perimeter of the structure including covered decks and patios. Uncovered decks shall be measured from the side of the deck on all exposed sides. ... The EIZ shall be landscaped using gravel, pavers, or other non-combustible materials. The EIZ shall be maintained free of all combustible materials at all times.
Full Breakdown
Section 603 of Austin's Wildland-Urban Interface Code local amendments (City Code Sec. 25-12-183) requires "defensible space" around any structure inside a mapped wildland-urban interface area. 2 scales that distance to the Proximity Zone assigned under Sec. 4: Zone C structures clear 30 feet, Zone B structures clear 50 feet, and Zone A structures, the closest to wildland, must clear a full 100 feet, each measured to the property line if that's shorter. Layered inside every zone's buffer is a stricter five-foot ring next to the building itself: Sec.
)," with lawn furniture, door mats and planter boxes also barred from the zone. Responsibility for keeping the buffer clear falls on "persons owning, leasing, controlling, operating, or maintaining" the property under Sec. 2, and trees are allowed inside the defensible space only if maintained under Sec. 4 to prevent fire from spreading through the canopy, with pruning of Protected or Heritage trees still subject to the Land Development Code and the Environmental Criteria Manual regardless of the defensible-space rule.
Violations & Fines
Failing to establish or maintain the required fuel-modification buffer or Ember Ignition Zone is a WUI Code violation enforced under the same misdemeanor framework as the Fire Code, City Code Sec. 25-1-462, prosecuted in Municipal Court by the fire code official. Because Sec. 603.2.2 places maintenance duty on any person owning, leasing, controlling, operating, or maintaining the property, a tenant or property manager can be cited alongside the owner for an unmaintained defensible space.
Frequently Asked Questions
How much vegetation clearance does my Austin home need if it's in a wildfire zone?
What is Austin's Ember Ignition Zone and how is it different from defensible space?
Can I keep trees on my property inside the defensible space?
Sources & Official References
Other rules in Austin
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