Is Your Home in the Jeffco WUI? What It Means for Your Next Deck
If you live on the west side of the Denver metro, you've probably heard "WUI" more in the last year than in your whole life before that. It stands for Wildland-Urban Interface: the places where neighborhoods meet open space, grassland, and forest, and where wildfire risk is higher.
Here's what it means if you're planning a new deck or replacing an old one.
What changed in Jefferson County?
Colorado set up a statewide wildfire resiliency code, and counties had to adopt standards to meet it. Jefferson County said it expected its standards to take effect by July 1, 2026. According to the county, they apply to new construction and exterior alterations in unincorporated WUI areas, including re-roofing, re-siding, additions, and deck replacements.
In other words, if your house is in the WUI and you're building or replacing a deck, the new rules likely apply to you.
How do I know if I'm in the WUI?
The honest answer is to check your address with the county, or ask us to. A few things make it more likely:
You're in unincorporated Jefferson County, not inside a city's limits
Your property backs onto open space, grassland, or forest
You're in a foothills or mountain community like Evergreen, Conifer, Morrison, or the area around Golden
Cities run their own permit processes. Golden, for example, handles its own permits, so the rules can differ from unincorporated Jeffco even a few miles apart. That's why we confirm the requirements for your specific address before we design anything.
What does the code mean for decks?
The big change is the deck surface. The county requires fire-resistant decking in WUI areas, and for Jeffco that means a Class A fire-rated decking system. A lot of the wood and composite decking that's been standard for years won't qualify.
The code also cares about what's close to the house. The county's guidance calls for no vegetation or flammable materials within five feet of structures, and nonflammable fencing within eight feet. That affects what you store under a deck and how the area around it is landscaped.
Does the frame matter too?
The rules focus on the surface, but the frame is still worth thinking about. A noncombustible frame under a fire-rated surface is a sensible pairing. That's one reason our Forever Frame steel package is popular with WUI homeowners: steel doesn't burn, rot, or warp.
Will this make my deck more expensive?
Usually, somewhat. Fire-rated decking costs more than basic boards, and the permit has more steps. The upside is that the materials that meet the code tend to be the long-lasting, low-maintenance ones people want anyway. We'll walk through options and tradeoffs at the consultation, and every quote is fixed and itemized, so you can see exactly where the money goes.
Who handles the paperwork?
We do. We pull the permit, provide the drawings and details plan check asks for, and schedule the inspections. You can read more on our WUI decks page.
If you're not sure whether your home is in the WUI, send us your address. We'll find out, tell you what it means for your project, and help you plan a deck that passes inspection the first time.
