What are Utah's new WUI wildfire roofing codes, and do they apply to my home?

Two different Utah wildfire rules changed, and they are not the same

Almost every confused conversation we have about this comes from treating one change as two, or two changes as one. They are separate, they run on separate maps. Only one of them is about your roof.

• The Utah Wildland-Urban Interface Code. The building side. Cities and counties with enough wildland interface had to adopt and enforce it by January 1, 2026, jurisdiction by jurisdiction rather than as one statewide rule. This governs roof coverings, other exterior materials, and defensible space
• House Bill 48. The money and insurance side, passed in the 2025 session. It established a statewide high-risk WUI boundary, created per-structure fees inside it. Requires insurers to use that boundary when assessing your wildfire risk

The practical consequence: you can be inside your city's adopted area for building purposes, inside the state's high-risk boundary for fees and insurance, inside both, or inside neither. Different maps, different offices.

How to find out whether the wildfire code applies to your home

Two checks, because there are two systems. Both are free and neither requires a contractor.

1. For the roofing requirement, call your city or county building department. Give them your street address and ask: have you adopted the WUI code, is my parcel inside your mapped area. What roof assembly class do you require here? Jurisdictions publish their own maps, so this is the only answer that binds.
2. Ask which edition they adopted and whether they amended it. Utah jurisdictions have often worked from the 2006 Utah Wildland-Urban Interface Code. Local amendments are normal. Get a code section reference or an email you can forward to bidders.
3. For fees and insurance, check the state high-risk WUI boundary. That map is maintained by the Utah Division of Forestry, Fire and State Lands and published through the state's wildfire risk portal. It is the boundary your insurer is required to use.
4. If you are near the foothills, call your fire district too. Fire authorities often hold the underlying hazard mapping and tend to be generous with their time.

Do not take a roofing salesperson's word for whether it applies. Some know and many do not. The person whose bid depends on the answer is the wrong first source.

What the roof requirement actually is

Roof coverings are fire-tested and rated by class, with Class A representing the highest resistance to flame spread and burning brands, then Class B, then Class C.

Utah's WUI code generally sets the floor at a Class B roof assembly or an approved noncombustible roof covering, and it does not permit wood roof coverings in the interface. Class A sits above that floor. It is often specified and often the sensible choice. But it is not automatically what the code demands. Because jurisdictions adopt and amend locally, the class enforced at your address has exactly one correct answer and it belongs to your building department.

Assembly is the word that trips people up

The word that trips people up is assembly. The rating belongs to the tested system, not to the shingle by itself. The covering, the underlayment beneath it, and sometimes the deck all participate. So a product that reaches a rating in one configuration may not reach it in another. "It's rated" is not an answer. The named product plus the named assembly is.

It also reaches past the field of the roof. That's because embers get in at openings rather than through the middle of a slope. Eaves and soffits, vents and their screening, valleys. Roof-to-wall junctions all matter, and so do gutters full of dry needles.

The part that catches homeowners: replacement triggers it

If your roof is sound, nothing here forces you to change it. The requirement attaches to work, not to the age of what you already have.

What triggers it is replacement. Under the Utah WUI code language, a roof covering on a building that existed before adoption has to meet the new-construction standard when it is replaced, or when 50 percent or more of it is replaced within a 12-month period. So the day you decide to reroof is the day this becomes yours.

That has consequences worth acting on:

1. Confirm the requirement before you collect bids, not after. It changes what the correct roof is. So a bid written without it is quoting a different job.
2. Put the required class in writing to every bidder. Now the bids are comparable. Nobody wins on price by quoting a non-compliant assembly.
3. Make each company name the specific tested assembly, underlayment included.
4. Ask how they are detailing eaves, vents. Edges, since that is where an otherwise compliant roof gets undone.
5. Ask whether they have permitted a roof under these provisions in your jurisdiction.

One more: talk to your insurer separately. Wildfire exposure is being priced more carefully in Utah than it used to be. It is worth knowing where you stand before you spend.