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Basic wildfire protections for a new Colorado home were estimated to add about $2,200—or less than 1%—to its construction cost, according to a CU Boulder study reported by KUNR Public Radio. That figure describes a basic protection package, not every level of resilience: the study’s broader modeled estimates range from about 0.6% to 10.8%, depending on the approach and county.
The findings show how targeted exterior upgrades can fit within a new-home budget, but they do not guarantee a home will survive a wildfire or establish insurance savings. The applicable code, site, design, and deck choices all affect what protection costs and what a project must include.
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The headline figure—about $2,200, or less than 1% of construction costs—is an estimate for basic wildfire protections. A higher protection level was estimated at about $15,600, or 4.2% of construction costs, in KUNR’s account of the CU Boulder study. These examples should not be treated as a universal price quote: the report modeled different construction approaches across selected counties, and costs vary with the home and jurisdiction.
The broader summary from the Cooperative Institute for Research in Environmental Sciences (CIRES) reports added costs of approximately 0.6% to 10.8% for code-level approaches across seven counties. Boulder County was analyzed separately because its existing wildfire requirements were already comparable in cost to the lower-tier statewide standard; higher-tier standards there raised costs by almost 11%.
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The study assessed new single-family homes in Boulder, Jefferson, El Paso, Summit, Grand, Delta, La Plata, and Las Animas counties. It compared five construction approaches, from typical pre-code practices to stricter wildfire-resilience standards. The percentage figures therefore describe modeled incremental construction costs under those approaches—not a price guarantee for every new home in Colorado.
Why can exterior wildfire protections cost less than expected?
Most of a home’s construction budget goes to components that are not the main focus of wildfire-hardening requirements. CIRES attributes 85% to 90% of total construction costs to the foundation, framing, floors, and insulation. Requirements typically affect a narrower set of features, including roofing, siding, vents, windows, doors, decks, and landscaping near the home.
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That distinction helps explain why an exterior protection package can raise the total budget by a relatively small percentage even when it changes important parts of the building envelope. It also helps explain why the price rises with stronger requirements: more extensive details, materials, and installation can add cost even though they apply to a smaller share of the whole house.
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Why do decks make such a difference?
Deck requirements were the largest source of the cost difference between lower and higher protection levels in the study summary. CIRES reports that the gap between protection levels fell from 10.2 percentage points to 1.2 percentage points when decks were excluded from the comparison.
That finding makes deck design a key cost discussion for builders and buyers, not a minor detail. A project estimate should identify which deck requirements are included, how the deck connects to the home, and what materials and construction details are specified. The study’s figures do not establish that every deck has the same cost impact; the effect depends on the design and the applicable standard.
Why do wildfire codes focus on embers?
Embers, also called firebrands, can travel ahead of a fire’s main flame front and ignite vulnerable materials around or on a structure. This makes roof edges, vents, gutters, decks, and combustible materials close to the house important parts of wildfire resilience, even when direct flame contact is not expected at the building.
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Colorado’s Ignition Resistant Construction Design Manual reproduces findings from the Waldo Canyon investigation in Colorado Springs: among the listed burned-structure ignition categories, firebrands or embers accounted for an estimated 54%, vegetation exposure 22%, structural exposure 16%, and direct flame contact 8%. Those figures apply to that investigation’s categories, not to all Colorado wildfires or to a statewide share of damaged homes. The manual identifies screened attic vents, composite decking, and Class A roofing among defenses against ember-initiated ignition.
Ember resistance is important, but it is not the whole of wildfire resilience. Higher protection levels can also address radiant heat and direct flame contact. The appropriate combination depends on the local hazard classification and code requirements.
What does Colorado’s Wildfire Resiliency Code require?
The 2025 Colorado Wildfire Resiliency Code applies in designated wildland-urban interface (WUI) areas, with requirements tiered by mapped fire-intensity classification. The state describes Class 1 hardening for low-intensity areas and Class 2 hardening for moderate- and high-intensity areas. Whether a provision applies to a particular project depends on the maps, local adoption and amendments, and the authority having jurisdiction. Check the Colorado Division of Fire Prevention and Control’s code information and confirm requirements with the local building department before finalizing plans.
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Examples in the code include Class A roof coverings, noncombustible gutters and downspouts, and covered ventilation openings. For specified openings, the code allows listed vents tested under ASTM E2886 with the required performance or a prescriptive option using noncombustible, corrosion-resistant mesh with openings no larger than 1/8 inch. A generic mesh product or vent should not be assumed compliant: its specifications, installation, ventilation design, and local approval matter.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should a builder or buyer use the cost estimates?
Use the study figures as a starting point for a project-specific conversation, not as a construction bid. Ask the design and construction team to identify the required protection tier, the materials and details that meet it, and the incremental cost of those features in the actual plans.
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- Confirm the site’s requirements. Ask the local building department or authority having jurisdiction whether the lot is in a designated WUI area, which mapped fire-intensity classification applies, and whether local amendments affect the state code.
- Define the protection level being priced. Distinguish a basic ember-focused package from higher-tier requirements that address additional exposures. Compare like with like rather than treating the study’s low and high estimates as interchangeable.
- Ask for exterior details in writing. Request the specified roof covering, vents, gutters, siding and wall details, windows and doors, deck construction, and near-home surface treatment. For vents or mesh, confirm the exact code pathway, listing or specifications, and approval.
- Separate deck costs. Ask how deck requirements affect the estimate. Since decks accounted for much of the gap between protection levels in the study, a clear deck scope helps explain why two otherwise similar budgets may differ.
- Compare the estimate with the home’s total construction budget. The headline percentages are incremental modeled costs, not a prediction of what any particular contractor will charge. Site conditions, design, labor, material choices, and jurisdiction can change the result.
What the study does—and does not—show
The estimates describe modeled construction-cost differences for selected counties and building approaches. As KUNR notes, they do not include ongoing maintenance or potential insurance savings. The study summary also does not establish actual claims avoided, a long-term return on investment, insurance discounts, or a guarantee that a protected home will survive a wildfire.
That distinction matters when weighing the cost. Code-compliant construction can reduce vulnerabilities, particularly to embers, but wildfire behavior, exposure, maintenance, and other site conditions still affect outcomes. Virginia Iglesias, CIRES scientist and director of Earth Lab, said the estimates can help builders, homeowners, and policymakers understand how greater protection can fit within housing budgets. The practical next step is to pair that broad cost context with the project’s local code requirements and an itemized construction estimate.
Frequently Asked Questions
Does the 1% estimate include landscaping and maintenance?
The modeled construction estimates cover wildfire-related construction approaches, including some exterior and near-home features. KUNR says ongoing maintenance is not included, so upkeep should be considered separately in a project’s long-term planning.
Will wildfire-resistant construction lower my homeowners insurance premium?
The study does not establish insurance discounts or savings. Ask your insurer directly whether specific, documented construction features affect eligibility or rates; do not assume a discount based on the study’s cost estimates.
Can I use 1/8-inch mesh on any attic vent and call it code-compliant?
No. The code’s prescriptive option has requirements for the mesh material and opening size, and the vent design, installation, applicable code provisions, and local approval also matter. Confirm the exact specification with the building official or design professional.
Does the study mean a wildfire-resistant home cannot burn?
No. The findings quantify estimated added construction costs, not a guaranteed outcome in a wildfire. Resilience measures address specific ignition pathways and exposures, while actual risk also depends on fire conditions, the site, and maintenance.
