Short answer: In unincorporated Douglas County you need a roofing permit past 100 square feet, only one layer of asphalt shingles is allowed, and wood shakes are prohibited. A separate wildfire code adopted July 1, 2026 adds Class A assemblies, ember-resistant vents and heavier valley metal — but only on mapped parcels outside town limits and fire districts.
Two things changed in Douglas County this summer, and between them they touch almost every re-roof in the county. On July 1, 2026 the Board of County Commissioners adopted the Douglas County Wildfire Resiliency Code. And on August 12, 2026 a new state law — Senate Bill 26-155 — takes effect that will eventually fund grants for impact-resistant roofs.
We're based in Parker, in this county. Here is what actually applies to your house, what doesn't, and where the sales pitches drift from the rulebook. Every rule below is quoted or paraphrased from the county's or the state's own published documents, all linked at the bottom — and we re-read every one of them on August 5, 2026 before publishing this.
Do I need a permit to replace my roof in Douglas County?
Yes, for anything beyond minor work. The Douglas County Building Division puts the line at one roofing square: "For minor repairs or replacing less than one (1) roofing square (100 square feet) of the roof, a permit is not required." Past that you need one, and each separate structure on the property needs its own permit — with an exception for one-story detached accessory structures under 200 square feet.
- Inspections: a final roofing inspection is required on every roofing permit. A mid-roof inspection is required only for tile, slate, stone-coated steel, or any system that uses battens — performed when the roof is 25 to 50 percent complete.
- Ladders: "The permit holder shall provide a ladder, secured for safe access to the roof, on the day the inspection is requested to be performed." County inspectors do not carry them. It's a small thing and a fair tell — a contractor who doesn't know this hasn't pulled many permits here.
- Drip edge: minimum 4 inches by 2 inches on eaves, and 2 inches by 1 inch or D-style edge metal on rakes.
- Weight: roof systems shall not exceed 600 lbs per 100 sq ft without analysis by a Colorado-registered professional structural engineer — which is why a heavy tile or stone-coated product is not a casual swap.
- All roofing systems are inspected to the 2024 International Codes and the manufacturer's installation specifications.
How many layers of shingles does Douglas County allow?
One. The county's answer is a single sentence: "One layer is permitted. Asphalt shingled roofs shall not be overlaid with an additional layer of asphalt shingles." If a bid quotes you an overlay on an existing asphalt roof in unincorporated Douglas County, that bid does not pass inspection. Tear-off is not the contractor upselling you here — it's the code. If you're still weighing scope, our repair-versus-replace walkthrough covers where that line usually falls after hail.
Are wood shakes or cedar shingles allowed in Douglas County?
Not in unincorporated Douglas County: "Wood shakes and shingles are not permitted in unincorporated Douglas County." There is one narrow exception. Where repair or replacement of an existing wood shingle or shake roof is less than 25% of the total roof area, the existing covering can remain and be matched — and all new replacement material must carry a Class "C" fire resistance rating.
Does Douglas County require a high-wind or premium shingle?
No — and this is the sentence you will not see quoted in many roofing ads. Verbatim from the county: "Douglas County does not require roofing materials or the attachment of roofing materials to meet high wind or severe climate conditions."
The county's actual minimum for asphalt shingles is an ASTM D 7158 Class D, 90 mph wind rating at elevations of 7,000 feet or below; above 7,000 feet it rises to 120 mph Class G. High-wind nailing is required only above 7,000 feet, and so is ice-barrier underlayment at the eaves. Most of Douglas County — Parker, Castle Rock, Lone Tree, Castle Pines, Highlands Ranch — sits below 7,000 feet.
Does the new wildfire code apply to my house?
Far less often than most articles about it imply. The Douglas County Wildfire Resiliency Code was adopted July 01, 2026 and is built on the 2025 Colorado Wildfire Resiliency Code. Plenty of coverage has suggested it blankets the county. Its own scope clause, section 101.2, does not:
That is three filters at once. The property has to sit in a mapped wildland-urban interface area, and outside any city or town's corporate limits, and outside any fire protection district's boundaries. Incorporated towns run their own adopted codes, and a great many unincorporated properties sit inside a fire protection district.
The only way to know is the map. The code names it at section 302.1 — the Colorado Wildfire Resiliency Code Map, linked in the sources below — and section 303.3 ties the requirements to your parcel's fire intensity classification of Low, Moderate or High. So if a bid includes wildfire-code upgrades, the fair question is which classification your parcel carries. The Douglas County Building Division will confirm it at 303-660-7497.
What does the wildfire code change if it does apply?
Five things matter for a roof. One note first, because it matters if you ever go read the document yourself: the adopted code has some internal cross-references that don't resolve. Section 101.6 points at "Sections 403.2 through 403.2.2," but in the adopted document 403.2 is gutters and 403.2.1 and 403.2.2 don't exist; the roofing rule is at 403.1. Section 403.3 points at 403.4.1 and 403.4.2, which also don't exist; the vent rules are at 403.3.1 and 403.3.2. We cite the sections that actually contain the requirements.
- The 25% trigger (section 101.6). Replace 25 percent or more of the roof's surface area and the code requires "the entirety of the roof covering to be replaced with a roof covering required for new construction." Below that threshold the work is exempt outright (section 102.10, item 4). This is the provision that turns a large repair into a full compliant replacement, and it's the one homeowners hear about last.
- Class A assembly (section 403.1). "Roofs shall have a roof covering or roof assembly classified as Class A when tested in accordance with ASTM E108 or UL 790." Separately — and this one runs across unincorporated Douglas County per the permit page — roof coverings in areas mapped low, moderate or high fire intensity must be Class A rated; areas not in those classifications need a minimum Class C.
- Valley flashing (section 403.1.2). "Valley flashings shall be not less than 0.019 inch (No. 26 galvanized sheet gage) corrosion-resistant metal installed over a minimum 36-inch-wide underlayment consisting of one layer of cap sheet complying with ASTM D3909 running the full length of the valley." That is a real material and labor cost, and a common omission in a fast bid.
- Ember-resistant vents (sections 403.3.1 and 403.3.2). Attic, rafter and underfloor vents must either be listed vents tested to ASTM E2886, or be covered with noncombustible corrosion-resistant mesh with openings not to exceed one-eighth inch. Standard attic vents generally do not meet this.
- Noncombustible gutters (section 403.2). "Gutters and downspouts shall be constructed of noncombustible material." Worth knowing if you're replacing gutters and roof together, which after hail is most people.
Is there a Colorado grant for an impact-resistant roof?
There will be. There is not one you can apply for today. Senate Bill 26-155 was signed June 4, 2026 and takes effect August 12, 2026 (Session Laws chapter 373). It creates the Strengthen Colorado Homes Enterprise inside the Division of Insurance, governed by a seven-member board, and in the legislature's own summary "at least 85% of the fee revenue must be used for grants to Colorado homeowners to retrofit residential property to reduce insurer losses due to hail and windstorms."
In awarding grants the board is directed to prioritize the applicant's primary residence, and to weigh applicant income, the age of the roof, the size of the home, the number of applicants, whether the home is in a locality with hail-resistant building codes, and whether the property sits somewhere historically more susceptible to extreme weather.
Now the honest part, and please hear this one clearly:
- The fee that funds the program does not begin until the 2027 calendar year, and it is charged to insurers — the law says an insurer "shall not surcharge the fee amount to policyholders."
- The board still has to adopt the rules, including the standards for what counts as a resilient roof system.
- There is no application open today. None.
One provision is worth flagging for a different reason: a contractor who is awarded bids and receives money from one of these grants is prohibited from waiving a homeowner's insurance deductible. Waiving deductibles is already prohibited by Colorado law (C.R.S. 6-22-105) and has always been a red flag. The new law simply adds one more reason it ends badly.
What we'd do if this were your house
- Find out whether the wildfire code touches your parcel before you collect bids. The map is linked below and the Building Division is 303-660-7497. Ten minutes now prevents a change order later.
- Ask every bidder three questions: is my parcel in a mapped wildland-urban interface area, does this quote include the Class A assembly, the 26-gauge valley detail and ember-resistant vents, and is this a tear-off? If they can't answer the first one, that tells you what you need to know.
- Don't let a code conversation turn into a fear pitch. Below 7,000 feet the county's own wind requirement is modest, and the county says so in writing.
- Watch for SB26-155 rules in 2027, not this month. We'll update this post when the board publishes standards.
- If you want a second read on scope, what a roof replacement should actually include is written out, and a free, no-pressure inspection comes with written findings you can hand to anyone.
Sources
- Douglas County Building Division — Roofing permits and requirements (county page last modified July 31, 2026)
- Douglas County — Building Codes and Amendments, which records the Douglas County Wildfire Resiliency Code as adopted July 01, 2026
- Douglas County Wildfire Resiliency Code — full adopted PDF
- 2025 Colorado Wildfire Resiliency Code Map
- Colorado General Assembly — SB26-155, Increase Access Homeowner's Insurance Enterprise (Governor signed June 4, 2026; Session Laws chapter 373, effective August 12, 2026)
This post describes published code and statute as of August 5, 2026. It is not legal advice and not a substitute for your authority having jurisdiction. Requirements change — verify with the Douglas County Building Division before relying on any of it.