The Colorado Wildfire Resiliency Code is a statewide construction standard for homes in mapped wildfire‑risk areas, called Wildland‑Urban Interface (WUI) zones. It does not force you to upgrade an untouched home. Instead, it sets modern fire‑safety rules for new builds and larger repair projects once work is already happening.
Colorado created this code after several destructive fires over the last fifteen years damaged or destroyed thousands of homes along the Front Range and in mountain communities. The goal is simple: make homes easier to insure and more likely to survive ember storms, wind‑driven flames, and burning debris. That means paying special attention to the parts of a house that are most exposed to fire.
The state map divides neighborhoods into three wildfire intensity levels: Low (yellow), Moderate (orange), and High (red). Low‑intensity areas follow a “Class 1” standard focused mainly on the top of the home: roof, gutters, and vents. Moderate and High areas follow “Class 2,” which includes everything in Class 1 plus requirements for siding, windows, and more.
| Map Color / Pattern | Intensity | Color Tier | What it Means |
| Solid Red | High Risk | Class 2 | Same regulations as Orange, hoewever insurance coverage may require homeowner upgrades. |
| Solid Orange | Moderate Risk | Class 2 | New regulations for siding, windows, doors, decking and flashing details. |
| Solid Yellow | Lower Risk | Class 1 | Regulations on "crown of home." Class A Roof, non-combustible gutters, guards & ember resistant vents. |
| Coss-Hatch (any Color) | Any | None | Federal or Tribal Land - not under CWRC Plan |
| No Shading | Not currently under CWRC Plan |
For homeowners, the most important idea is that the code follows the work. If you replace part of your roof, siding, or exterior walls above certain thresholds, the materials that go back must meet the new standard. No one can reinstall products the code now sees as too vulnerable, such as wood shake roofs or certain plastic vents, in mapped WUI zones.
You can review the state’s plain‑language overview at Colorado DFPC’s CWRC page, and then confirm details with your local building department, since cities and counties can adopt stricter versions of the rules.
The wildfire code applies when specific project “triggers” are met, not just because your home sits in a mapped zone. For existing homes, the two most important triggers are when 25 percent or more of your roof is replaced and when 25 percent or more of your exterior wall surface is replaced during a project.
Think of your home’s shell as three separate elements: roof, walls/siding, and windows or skylights. Each element has its own 25 percent rule. A roof job is measured against the total roof area. A siding job is measured against the total wall area. Replacing one does not automatically force upgrades to the others unless the work on that element crosses its own threshold.
For example, if hail damage requires replacement of 30 percent of a wood shake roof in a mapped orange zone, the roof trigger is met. The entire roof covering, not just the damaged slopes, must be brought up to Class A standard, and ember‑resistant vents and compliant gutters must be installed where work is performed. Siding and windows are not forced by that roof‑only trigger.
By contrast, if a storm damages vinyl siding on two elevations that together represent more than a quarter of your total wall area in a Class 2 zone, the wall trigger may convert that claim into a full‑wall upgrade conversation. The new wall system and ground‑level flashing need to meet current standards from foundation to eave.
One other trigger to know is project size. Additions or alterations over 500 square feet can bring more of the home under the code, closer to new‑construction rules. Because local amendments can adjust these thresholds, the safest path is always to confirm with your building department before a contractor starts work.
In many cases, the wildfire code and your homeowner’s insurance can work together through a policy feature called Ordinance and Law coverage. This coverage is what pays for code‑required upgrades when repairing covered damage, up to a limit that is often set as a percentage of your dwelling coverage.
When a covered event like a hailstorm or windstorm damages part of your home, the base claim typically pays to restore what you already had. Ordinance and Law coverage is the extra layer that recognizes you may not be allowed to put older, less fire‑resistant materials back on your house once the wildfire code applies. Instead, the replacement must meet today’s standards.
For example, if a storm damages a non‑compliant wood shake roof in a mapped Class 2 area and more than 25 percent needs replacement, your contractor may document a full reroof with a Class A assembly, ember‑resistant vents, and metal gutters with debris guards. The cost difference between the old system and the compliant system is often handled under Ordinance and Law benefits, subject to your policy limits.
It is important to remember that the code requiring an upgrade does not automatically mean the insurer will pay for all of it. Coverage depends on whether Ordinance and Law is included, how high the limit is, and how well the upgrade is documented and cited to the correct code sections. Some Colorado carriers now highlight wildfire‑hardening features as a reason to keep premiums more stable.
Before the next storm season, call your agent and ask three specific questions: Do I have Ordinance and Law coverage? What is the dollar limit or percentage? Are there any wildfire‑hardening discounts if I upgrade my roof, vents, or siding? Documenting the answers now can prevent surprises when you file a claim later.
For most Colorado homeowners in WUI zones, the roof is where wildfire code changes show up first. Roof coverings must be Class A, either because the product itself is tested that way or because it is installed as part of a listed fire‑resistant assembly over the correct underlayment.
The clear win for many homes is that laminated fiberglass asphalt shingles from major manufacturers are already stand‑alone Class A products. If your home already has this type of shingle and it was installed after the early 2000s, the main wildfire‑driven changes may be in the accessories: swapping to ember‑resistant attic vents and adding metal gutters with debris protection where they are being replaced.
By contrast, older or specialty roof systems often need more attention. Wood shakes, some metal systems installed over wood decks, and certain synthetic products only achieve Class A when installed over a specific mineral‑surfaced cap sheet or other fire barrier. If your roof falls into this “assembly‑rated” category, the wildfire code can require a particular underlayment upgrade as part of the repair.
Vents are another critical piece. Standard plastic ridge vents, thin metal box vents, and 1/4‑inch insect screens at gables or soffits are not designed to stop embers. The code points contractors toward tested ember‑resistant vents or tightly screened metal designs with openings no larger than 1/8 inch. Colorado’s Division of Fire Prevention and Control lists acceptable test standards at its testing requirements page.
If you have a profile roof such as tile or stone‑coated steel, you may also see requirements for firestopping at the eaves or a specific cap sheet in valleys, which helps keep embers from getting beneath the roof covering.
In Moderate and High intensity zones (Class 2), the wildfire code looks beyond the roof to the full shell of the home. Here, siding, windows, and gutters can all be affected once work crosses the relevant trigger.
For siding, Class 2 areas expect noncombustible cladding, fire‑retardant‑treated wood, ignition‑resistant materials, or assemblies that meet a one‑hour rating from foundation to eave. Vinyl siding may still appear on homes, but in many cases it is only permitted when installed over a noncombustible or rated wall system. If hail or wind damage leads to replacement of more than 25 percent of your wall area, your contractor may recommend a different siding system to comply.
Windows and skylights are another focus. In Class 2 zones, new units generally need to be tempered glass, multilayer glazing, glass block, or a rated assembly. Simple single‑pane windows and plastic dome skylights can be vulnerable to radiant heat and wind‑borne debris. When storms break these units, the replacements may have to meet the newer standard even if the rest of your windows remain unchanged.
Gutters must be noncombustible, which rules out vinyl products. The wildfire code also treats debris guards as a fire‑safety feature rather than a luxury upgrade, since accumulated leaves and needles can ignite under ember attack. Where gutters are being replaced on a project in a mapped zone, expect metal systems with approved guards to become the norm.
These changes can feel like a lot at once, but the intent is consistent: close the small openings and fuel sources where embers most often ignite structures during wildfires.
If you own a home in the Colorado Front Range or mountain communities, you can take a few simple steps now to understand how the wildfire code affects you and to prepare for future projects or claims. Doing this work before a storm or wildfire event will help you make calmer, better‑informed decisions when repairs are needed.
Start by checking whether your home sits inside a mapped WUI zone. The state’s online map, the 2025 Colorado Wildfire Resiliency Code Map, is available through the Division of Fire Prevention and Control website. Because the map uses hexagon‑shaped areas rather than individual property lines, follow up with your local building department to confirm your exact classification, especially if you appear near a boundary.
Next, review your current exterior. Identify your roof type, approximate age, and whether your attic vents, gutters, siding, and windows appear modern or original. Photos and simple notes stored with your home records will be valuable for any future contractor or insurance adjuster.
Then, schedule a conversation with your insurance agent. Ask about Ordinance and Law coverage, wildfire‑hardening incentives, and any documentation they would like to see if you complete voluntary upgrades. Some agents may point you to educational resources or local programs that support mitigation work.
Finally, when it is time to repair or replace your roof or exterior, choose a contractor who can clearly explain how the wildfire code applies in your jurisdiction, how they will document compliance, and how they coordinate with insurers. A thoughtful, code‑aware scope of work can turn a stressful repair into a meaningful long‑term improvement in your home’s wildfire resilience.