Since July 1, 2026, roofing, siding, deck, and window projects in Jefferson County’s Wildland Urban Interface Overlay District are subject to specific requirements. A re-roof triggers roofing rules, while siding work may involve wall, flashing, eave, soffit, and five-foot defensible space requirements. Deck rebuilds often need a defensible space inspection by a county-approved specialist.
Knowing which project drags in which requirement decides what you do first and what can wait. GS Exterior Experts, serving the area since 1999, helps navigate Jeffco permit requirements and provides clear guidance on what to tackle first.
Jefferson County’s Building Safety Division reviews structure hardening through whatever permit you already have, and only the work on that permit has to meet the code. A new roof must be a Class A assembly, but the existing siding, windows, and deck stay as they are. Re-siding brings the wall, flashing, and eave rules, and nothing about the roof. The code is a set of doors, and each permit opens one.
The doors are not equal. A re-roof triggers no defensible space work. A re-siding permit triggers only Zone 1, the five feet around the house, which you can self-certify on a county form. Deck reconstruction and additions trigger the full defensible space chapter, including two inspections by a county-approved Wildfire Mitigation Specialist. Schedule the deck last, or the tree work ends up ahead of everything else.
The county publishes a list of eleven hardening elements, from roofing down to garage door gaps. Here is how they sort into the four projects we handle most in Evergreen, following the county's permit boundaries.
A full roof replacement inside the WUI must finish as a Class A assembly under ASTM E108 or UL 790, the standard in Section 402.2 of the county’s code. Repairs under 25 percent of the roof and under two squares need no permit, and a re-roof triggers no defensible space. Standing seam metal, stone-coated steel, and Class A synthetic shingles are among the options available through our professional roofing services.
A siding permit reaches further: approved wall materials, the Section 402.6 flashing inspection, and fascia, eaves, and soffits as their own elements. Zone 1 defensible space applies, with the county’s self-inspection form standing in for a specialist visit. James Hardie fiber cement, noncombustible under ASTM E136, anchors our siding services.
Replacing deck boards is maintenance and needs no permit. Replace a beam, a post, or 25 percent of the joists and the county treats it as deck reconstruction, which triggers the hardening rules, full defensible space, and a Wildfire Mitigation Specialist. Steel framing beneath a Class A or ignition-resistant surface can help meet these standards through our new deck replacement services.
The hardening requirements address windows, glazed doors, and exterior doors separately, with Class 2 properties subject to stricter standards than Class 1. Because glazing provides much of the protection, tempered and multi-pane glass can matter more than frame material. Before ordering, we confirm that each unit meets the requirements for your parcel’s classification through our window replacement services.
We file each permit with the product listings the reviewer needs, drawn from our fire-resilient product lineup, install to manufacturer specifications, and schedule the county inspections, handing you closed permits at the end.
Not every Evergreen exterior job wakes the code up, and the jobs that do are not all equal. Knowing both sides keeps a small repair from becoming a large project.
Repairs under 25 percent of your walls or roof, and under two squares, are outside the code and need no permit. Painting and staining never trigger anything. Sheds of 120 square feet or less set 10 feet from the house are exempt, as are fences more than 8 feet away. Inside that 8-foot line, fences and retaining walls must be noncombustible or ignition-resistant.
Deck reconstruction, additions, and new builds trigger full defensible space, which the county does not inspect itself. You hire a county-approved Wildfire Mitigation Specialist for an initial inspection, do the clearing, and get a final inspection before the building permit can proceed. Class 2 parcels add Zone 3 out to 100 feet. We schedule the deck around that date, not the other way around.
A code project in Evergreen is a sequencing job first and an installation job second. Here is how we run it.
We confirm you are in unincorporated Jefferson County, pull your class from the county map, and note whether you are Perimeter, Interior, or Intermix.
We inspect roof, walls, deck, windows, vents, and the first five feet, and list which elements are failing, which are compliant, and which the code would touch if you replaced them.
We lay out which projects to do now and in what order, so a re-roof does not accidentally wait on a Specialist inspection that only the deck requires.
We file each permit with the product listings the reviewer needs, install to manufacturer specifications, and schedule the county inspections, handing you closed permits at the end.
Most exterior contractors do one trade well. The Jefferson County code rewards a contractor who does four, because the permits interact, and one crew can order them.
What you bring: the address, a rough sense of what is failing, and any home assessment you have already had done.
What we bring: a James Hardie Elite Preferred Contractor’s siding crew, roofing crews certified on the Class A systems we install, deck builders who frame in steel, and a project manager who reads the county’s permit page the way the county does. Every exterior product we carry, including the noncombustible siding options beyond Hardie, comes with the listing documentation already in the file.
When several parts of your Evergreen home need attention, a coordinated plan can help you prioritize the work. GS Exterior Experts can inspect your roof, siding, windows, and deck, then recommend fire-resilient materials that fit your goals and budget. For more background, read our free guide to Colorado’s wildfire code.
We will provide a clear estimate outlining the recommended scope, potential project phases, and associated costs. Call (720) 683-6288 or complete our estimate form to schedule a consultation at your Evergreen home.
No. The county says the code is not retroactive and applies only to the elements covered by a permit you pull. Your existing roof, siding, and deck stay as they are until you replace them.
A re-roof triggers none. A re-siding permit triggers only Zone 1, the five feet around the house, which you can self-certify. Deck reconstruction, additions, and new construction trigger the full defensible space chapter with a county-approved Specialist.
The Jefferson County code and map apply only to unincorporated Jefferson County. Clear Creek County has its own adopted requirements, and we confirm which jurisdiction your parcel sits in before scoping.
Not if the roofing work leaves them alone. The county treats vents outside the re-roof scope as separate elements, so they come up on a siding permit or a dedicated project instead.
The county’s building and planning divisions do not offer grants, but the Jefferson County wildfire resilience hub points to a Colorado income tax incentive for mitigation and a reduced-cost slash collection program. Ask your insurer as well; some carriers offer incentives.
It depends on how much clearing the initial inspection calls for and on the Specialist’s schedule. We build the deck timeline around the final inspection date, so the permit is ready when the county is.
