Roofing 101 · The Rules Around Your Roof
Austin’s Wildfire Code and Your Roof Replacement
Austin is the only city in our footprint whose wildfire code reaches an ordinary reroof. Inside the mapped wildland-urban interface, the city says a job replacing half or more of the roof needs a permit, a Class A covering, specific valley and vent details, and its own fee lines. Most homeowners in west and southwest Austin have never heard of it. Everything below is taken from the city’s own pages, quoted and dated, so you can check each rule yourself before anyone signs anything.
Updated September 20, 2026
The Map Comes First
Is your home in Austin’s wildfire zone?
How to check your address in about a minute
Open the city’s WUI Code Map, search your address, and click your lot. The popup names the layer: Proximity Zones A and B, or Proximity Zone C. Zone A sits within about 50 feet of wildland and Zone B within about 150 feet, measured from the structure, not the lot line, and the two are drawn as one polygon on the map. The city’s own FAQ is candid that the map helps applicants get started but cannot replace verifying the site, so the map answer is a starting point, and the city’s code official settles a close call. A documented roof inspection records the roof and what the lot sits next to in the same visit.
The wildfire code applies inside Austin’s full purpose and limited purpose jurisdiction, not in the extraterritorial jurisdiction. If your mailing address says Austin but your lot sits outside the city limits, different rules apply, and the address, not the mailing city, decides.
The half-roof trigger, in the city’s own words
What the city’s exemption list actually says
Austin puts the answer in writing. Austin’s Development Services list of work exempt from building permits exempts “asphalt shingles that replace existing asphalt shingles, unless the property is located in the Wildland-Urban Interface area and 50% or more of the roofing is being replaced” (read September 11, 2026). A full reroof on a WUI lot is therefore a permitted job, and the city’s own permit data shows it in practice: issued residential express permits carry descriptions like “Express: WUI ZONE C reroofing with Class A Fire Roofing Material”, for example permit 2026-104007 (78749, August 2026) and permit 2026-114472 (78750, September 2026), both in the city’s public Issued Construction Permits dataset. So the same roof replacement that the list exempts elsewhere in Austin becomes a permitted job on a WUI lot at half the roof or more.
Permits are an Austin question decided by your address, and our permits and codes guide walks the same question city by city. Confirm what your own project needs with the City of Austin before work starts.
The fee lines on the city’s schedule
Published amounts, and the caveat the city attaches
These numbers are the city’s, not ours.
| Fee line, as the city names it | Amount on the schedule |
|---|---|
| Residential plan review application processing | $106.72 |
| Wildland Urban Interface fire plan review | $250.00 |
| Wildland Urban Interface fire inspection | $444.00 |
| Residential roof replacement inspection | $370.00 |
The schedule itself says these fees may or may not apply and are considered per case. The city decides which lines a job pays, so treat any single total a bid quotes for city fees as that bidder’s estimate, not the city’s number.
On The Roof Itself
What the code asks of the roof
Covering, valleys, vents: the same in Zones A, B and C
The roof rules read the same in all three zones. The Austin Fire Department’s WUI page lists them, and they read the same across the zones. The covering must be Class A rated with gaps fire-stopped or covered with an approved cap sheet. Roof valleys must use metal flashing or a woven valley: for the metal route the city names 26 gage corrosion-resistant metal installed over a 36 inch wide layer of 72 pound mineral-surfaced, non-perforated cap sheet complying with ASTM D3909, running the full length of the valley. Vent openings must be covered with non-combustible, corrosion-resistant mesh with openings of one eighth inch or smaller, and the city keeps an approved materials list that names specific screened vents. In Zones A and B, no soffit vents on the work being done; Zone C allows perforated soffits with ember mesh.
The valley detail that bids get wrong
A leak barrier is not the cap sheet the city names
The city names one specific product for the valley. That cap sheet is a specific product class: ASTM D3909 mineral-surfaced roll roofing. The self-adhered ice and water leak barriers common on Texas roofs are made to a different standard, ASTM D1970, and the data sheets we have read for the popular ones do not claim D3909. They are good products in their own lane, but under Austin’s WUI valley rule a substitution needs the code official’s written approval as an alternate material, agreed before the job, because the valley metal has to remain visible for inspection. Bids inside the WUI have been seen that specify a leak barrier in place of the cap sheet and carry no permit line at all. Our roofing system anatomy guide shows where the valley sits in the whole assembly.
The woven valley route has its own catch: several major laminated shingle lines do not allow weaving in their installation instructions, and a valley woven against the manufacturer’s instructions is a warranty problem. Whether the woven route is open depends on the shingle on the bid, so the cap sheet detail is the one to price by default.
What you do not have to change
The city’s retroactivity answer, plainly
You do not have to rebuild the house to reroof it. The city’s FAQ says existing buildings do not need to be changed, except when a code official determines they are a serious safety hazard. The current WUI code applies to work starting on or after July 10, 2025, including permit applications. A reroof triggers the roof covering rules. It does not, by itself, order new soffits or gutters on parts of the house not being worked on. What your specific scope triggers is the city’s call, so ask, and get the answer in writing.
Before You Sign
Four questions for any bid inside the WUI
If a bid cannot answer these, keep the pen in your pocket
Four questions sort every bid. Does the price include the city permit and the WUI fee lines, named as the city names them? Which valley detail is specified, and is the D3909 cap sheet on the material list? Are the vents on the city’s approved materials list, or covered with one eighth inch metal mesh? And who meets the city inspector? A bid that answers all four in writing is a bid from someone who has read the rule. Our guide to choosing a roofing contractor carries the longer list, and after a hail season the storm damage guide covers the other half of the story for a roof in Austin. The Roof Shepherd documents the roof, the map lookup and the scope first, so the decision, and the bid comparison, run on evidence.
WUI Reroof Questions
Austin WUI reroof questions, answered
Does replacing a roof in Austin require a permit?
Austin’s exemption list says no permit for asphalt shingles replacing asphalt shingles, unless the property is in the wildland-urban interface and half or more of the roofing is being replaced. That exception means a full WUI reroof is a permitted job. The address decides, so confirm your property with the City of Austin before work starts.
How do I find out if my home is in Austin’s WUI?
Open the city’s WUI Code Map, search your address, and click the lot. The popup names the layer, either Proximity Zones A and B or Proximity Zone C. The city’s own FAQ says the map helps applicants get started but cannot replace verifying the site, so treat the map answer as a starting point and confirm with the city for your address.
What are the permit fees for a WUI reroof in Austin?
The city’s residential fee schedule in effect since October 1, 2025 lists a plan review application processing fee of $106.72, a WUI fire plan review at $250.00, a WUI fire inspection at $444.00, and a residential roof replacement inspection at $370.00. The schedule itself says these may or may not apply and are considered per case, so the city, not any contractor, decides which lines your job pays.
Can ice and water shield replace the valley cap sheet in the WUI?
Not as a drop-in substitute. The city names a cap sheet complying with ASTM D3909 under the valley metal. Ice and water leak barriers are made to a different standard, ASTM D1970, and the product data sheets we have read do not claim D3909. A substitution needs the code official’s approval as an alternate material, in writing, before the job.
Do I have to upgrade soffits or gutters when I reroof in the WUI?
The city’s retroactivity FAQ says existing buildings do not need to be changed, except when a code official determines a serious safety hazard. A reroof triggers the roof covering rules, not a soffit replacement. Vent and gutter requirements apply to the work being done, so ask the city what your specific scope triggers.
Still don’t see your question?
Get a straight answer and your real options, no obligation, never a hard sell.
Prefer a person? Call or text 512-575-5052, 8am to 9pm, seven days a week.
Get Help Ask Shepherd AIKeep Learning
Where to go from here
The city pages behind this guide change when the city revises them, so check the rule for your own address, and read the threads this page pulls on: what permits look like across Central Texas cities, what we document in Austin, and what an inspection costs.
Keep Learning
More guidance like this, once a month
One practical Texas roof and property protection guide in your inbox, about once a month and never more than that. A confirmation email comes first, so nothing arrives unless you click the link inside it.