Unincorporated Douglas County inspects roofs to the 2024 International Codes, and you need a permit for any replacement or any repair over one square (100 square feet). One layer of asphalt is allowed, wood shakes are not, and an ice barrier is required above 7,000 feet.
General information, read from the official sources listed below on 2026-10-28. Codes and local policies change, so confirm the rules for your address with the building department before work starts.
Douglas County (unincorporated) roof code data table
| Item | Douglas County (unincorporated) |
|---|---|
| Adopted IRC edition | 2024 International Codes plus manufacturer installation specifications. Source: Douglas County roofing permits |
| Adopted IBC edition | 2024 International Codes. Source: Douglas County roofing permits |
| Adoption or effective date | Not fully verified: Adoption date not stated on the county roofing page. |
| Roofing amendments and local policies | No asphalt over asphalt. Drip edge at least 4 x 2 in at eaves and 2 x 1 in or D-style at rakes. Wood shakes and shingles not permitted (repairs under 25% of an existing wood roof may match with Class C or better). Class A in low, moderate or high fire intensity areas on the 2025 CWRC map; Class C minimum elsewhere. Roof systems over 600 lb per 100 sq ft need a Colorado-registered structural engineer. Source: Douglas County roofing permits |
| Ice barrier rule | Required above 7,000 ft, from the lowest roof edge to at least 24 in inside the exterior wall line. Source: Douglas County roofing permits |
| Ground snow load | Not fully verified: Not stated on the county roofing page. |
| Design wind speed | Shingles: ASTM D7158 Class D (115 mph) minimum below 7,000 ft; Class G (130 mph) with high-wind nailing at 7,000 ft and above. Source: Douglas County roofing permits |
| Reroof permit trigger | Any replacement, or repairs over one square (100 sq ft). One permit per structure. One-story detached accessory structures of 200 sq ft or less are exempt. Source: Douglas County roofing permits |
| Layers allowed | One layer of asphalt shingles. Source: Douglas County roofing permits |
| Wildfire / WUI code status | Projects in fire intensity class 1 or 2 are subject to the Colorado Wildfire Resiliency Code; Class A required in low, moderate and high intensity areas. Source: Douglas County roofing permits |
| Inspection requirements | Mid-roof for tile, slate, stone-coated, steel or battened roofs at 25 to 50% complete; do not go past 50% before it passes. Source: Douglas County roofing permits |
| Permitting office | Douglas County Building Division, roofing permits. Source: Douglas County roofing permits |
What it means for a homeowner reroofing in Douglas County (unincorporated)
These rules cover homes outside town limits, including Highlands Ranch. Incorporated towns such as Castle Rock run their own building departments, so check which one issues permits for your address before comparing quotes.
Elevation splits the county rules at 7,000 feet. Above it, the roof needs an ice barrier and Class G shingles nailed to the high-wind pattern. Below it, Class D shingles meet the minimum and an ice barrier is not required by the county.
Cedar shake owners face the biggest change: the county no longer permits wood shakes or shingles, so a full replacement means a new material. Heavy systems over 600 pounds per square, such as some tile, need a structural engineer first.
Common inspection failures in Douglas County (unincorporated)
These are items the building department's own code or handouts say it checks or rejects. No public data ranks how often each one fails, so the order means nothing.
- Asphalt laid over an existing asphalt roof.
- Rake drip edge smaller than 2 x 1 in or not D-style.
- Tile or stone-coated steel roof covered past 50% before the mid-roof.
- Class C covering used on a parcel in a mapped fire intensity area.
- Low-elevation nailing pattern used on a home at 7,000 ft or higher.
Steps to permit a reroof in Douglas County (unincorporated)
- Confirm the address is unincorporated Douglas County and check its elevation.
- Check the 2025 CWRC map for the parcel fire intensity class.
- Pull one permit per structure.
- For tile, slate, steel or battens, call for the mid-roof at 25 to 50%.
Related pages
- Highlands Ranch roofing
- Highlands Ranch roofing code guide
- Colorado Wildfire Resiliency Code on a reroof
- Roof replacement
- Roof repair
- Hail damage repair
- Free roof inspection
- Compare roof codes by jurisdiction
Hail history by ZIP in Douglas County (unincorporated): 80116 (Franktown), 80118 (Perry Park), 80126 (Highlands Ranch)
Sources
Compiled by Integrity Roofing and Painting, roofing Colorado homes since 1990 (36 years in business). We are an Owens Corning Platinum Preferred contractor with 650+ Google reviews, and our repair scopes follow the local code and the manufacturer's installation and warranty requirements. We do not issue permits or rule on code; the building department does.
