Before pricing your siding project in unincorporated Jefferson County, it is crucial to measure. If your replacement covers less than 25% of the wall area, a simple repair is sufficient. Exceeding that threshold makes it a structure-hardening project under new codes. For example, patching the sunny side of a cedar house is fine, but replacing it with a single gable may require that all siding meet county standards.
That is not a reason to avoid the project, but to complete it with suitable material. GS Exterior Experts, a James Hardie Elite Preferred Contractor, will clarify how the Jeffco rules apply, why Hardie fiber cement is suitable, and what we manage for you.
The county reviews structure hardening through the normal siding permit, with no extra fee beyond the standard schedule. Three parts of the code are attached to that permit, and each one is something we plan for before the material is ordered.
Section 402.5 of the Jefferson County Wildfire Resiliency Code limits exterior walls to a short list: noncombustible siding, fire-retardant-treated wood, ignition-resistant materials, mass timber or log construction, and vinyl only when it sits over a fire-rated or noncombustible assembly. Hardie fiber cement is noncombustible under ASTM E136, which places it in the first category. Cedar lap, T1-11, and untreated hardboard, the three claddings we remove most often in Evergreen, are not on the list.
The county says plainly that the flashing requirements in Section 402.6 are enforced on re-siding permits, though not on re-roofing permits. That means the inspector looks at how the wall meets the ground, the deck ledger, and the roof-to-wall intersections. We install metal flashing at each of those transitions as part of a Hardie system, which is also what keeps water out of the sheathing for the next thirty years.
A re-siding permit triggers the county’s Structure Ignition Zone 1 standard, meaning the five feet around the house: no plants except mature trees, no wood mulch, no stored firewood, and tree crowns trimmed five feet from the walls. The county lets a homeowner self-inspect that zone for a siding permit and attest to it on a county form, instead of hiring a Wildfire Mitigation Specialist. We walk that zone with you and flag anything the form would catch.
Jefferson County’s FAQ states that if you replace less than 25% of your siding, the wildfire code doesn’t apply. If you replace 25% or more of the siding, all siding must meet the allowed material standards. Additionally, no permit is needed for work under 200 square feet and under 25% of the total.
For a typical Evergreen home with 2,500 to 3,500 square feet of wall area, the no-permit window closes quickly. A failed elevation of T1-11 or cedar lap often exceeds 200 square feet, and two elevations usually surpass a quarter of the total. We measure the walls on the first visit, providing actual numbers to help you decide between a small repair and a full re-side.
Most Evergreen homeowners who call us want fiber cement's fire rating without giving up the wood character of the house. Each profile below carries the same HZ5 formulation and warranty terms listed on Hardie's HZ5 product line page, and each has a specific job on a mountain home.
Hardie’s cedarmill texture reproduces the grain and shadow line of the 6-inch and 8-inch cedar lap that covers half the houses off Upper Bear Creek Road. Installed over new HardieWrap and flashing, it keeps the lap rhythm while replacing a combustible wall with a noncombustible one.
T1-11 plywood was the default cladding on Evergreen’s 1970s and 1980s builds, and it fails from the bottom edge up. HardiePanel with HardieTrim battens gives the same vertical board-and-batten read in fiber cement, with fewer seams on tall walkout walls.
Staggered-edge HardieShingle suits the gable ends and dormers of Evergreen’s cabin-style plans, where a cedar shake accent is often the last combustible material left on an otherwise hardened house. Finishing that gable in fiber cement closes the gap without changing the silhouette.
The Jeffco code lists fascia, eaves, and soffits as their own hardening elements, separate from the wall. Fiber cement trim and vented HardieSoffit panels protect those edges with a 15-year non-prorated warranty, and they take the deep browns and greens most Evergreen exteriors favor.
Two Evergreen realities push the decision toward fiber cement. One is the maintenance cycle that wood demands at this elevation, and the other is the risk ranking that the county itself now publishes.
Cedar and hardboard on a south- or west-facing wall in Evergreen require refinishing every few years, becoming increasingly costly due to checking and cupping. In contrast, Hardie’s ColorPlus finish is factory-baked with a 15-year warranty against peeling, cracking, and chipping, while the substrate has a 30-year non-prorated warranty. You only repaint for a new color, not due to wood failure.
Jefferson County cites the U.S. Forest Service’s 2024 Wildfire Risk to Communities analysis, ranking it second in Colorado for wildfire risk and above 98% of counties nationwide. The 2026 code enhances safety with wildfire zoning since 1976 and structure hardening in the Wildland-Urban Interface since 2020. Residents should check with their insurance provider about potential discounts for noncombustible cladding, as this varies by company.
Five short steps carry an Evergreen Hardie project from the first phone call to a closed permit. Each one produces a document you can keep.
We check your parcel on the county’s WUI Overlay District map to confirm Class 1 or Class 2 status and whether you sit in unincorporated Jeffco at all.
We measure total wall area and the failed sections, then show you where your project lands relative to the repair threshold.
We walk the five feet around the house with you, note anything that needs clearing, and prepare the county’s defensible space certification form for your signature.
We file the siding permit with Hardie’s documentation, then strip, flash, wrap, and hang the fiber cement system to Hardie’s published specifications.
We schedule the county inspection, address any correction items, and give you the closed permit alongside the warranty registration.
Evergreen exterior projects can involve wildfire requirements, detailed documentation, and coordination across several parts of the home. We help simplify the process from planning through inspection.
Hardie is what we recommend on most Evergreen homes, but you can see it beside metal and Woodtone options in our complete siding catalog, and you can watch a finished Evergreen fiber cement and metal exterior before you decide.
If you are weighing a patch against a full re-side, do not decide from the driveway. Let us measure the walls, pull the county map for your address, and lay out what the 25 percent rule means for your house in particular. You will leave that visit with a written scope, a price, and a clear answer on whether a permit and a Zone 1 walk are part of our job. Reach us at (720) 683-6288 or through the estimate form, and we will get up the hill.
For unincorporated Jefferson County, no permit is needed if the work is under 200 square feet and under 25 percent of your total siding. Anything larger requires a siding permit, and at 25 percent or more, the whole house must be finished in approved materials.
The county’s interactive WUI Overlay District map shows Class 1 in blue and Class 2 in orange. Class 2, the intermix zone, carries more hardening and defensible space requirements. We check the map during the first visit.
Yes. Section 402.5 allows noncombustible siding, and Hardie fiber cement is noncombustible under ASTM E136. Hardie’s test documentation goes into the permit packet, so the reviewer never has to ask.
No. For re-siding, the county applies only the Zone 1 standard, which is the five feet around the structure. Zones 2 and 3 are not triggered by a siding permit.
HardiePlank’s cedarmill texture, HardiePanel board-and-batten, and staggered HardieShingle all reproduce common Evergreen wood profiles in fiber cement, and ColorPlus comes in the earth tones that suit the mountain setting.
The county applies the Wildfire Resiliency Code to applicable permits issued on or after July 1, 2026. If your permit was pulled earlier, the previous rules govern; if not, the new code does.
