Yes — unless the job is under 100 square feet. The City of Fort Collins exempts “roofing repairs up to 100 square feet (one roofing square) per building” and requires a permit for everything above that, which means every real reroof needs one. The city is equally clear that “permit exempt does not mean code exempt”: a small repair still has to meet code, it just does not need paperwork.
Roofing is handled as a fast-track permit, so there is no plan review to wait on. The residential building permit fee is $85 ($210 commercial), plus city sales tax calculated on the total project valuation, materials and labour.
What follows is what actually applies to a Fort Collins reroof as of August 2026, taken from the city’s adopted code amendments rather than from general advice.
Which code does Fort Collins use, and from when?
Fort Collins adopted the 2024 International Codes effective April 1, 2026. The detail that catches people out is the trigger: the city’s rule is that “if your permit was submitted on or after April 1, 2026, the Current Building Codes (2024 International Codes and local amendments) apply.” It keys to the date the permit was submitted, not the date the work happens. A roof permitted in March 2026 and installed in June is a 2021-code job.
Are Class 4 impact-resistant shingles required in Fort Collins?
Above half the roof, yes. The 2024 adoption added a new section — R905.2.4.2, Impact resistance of asphalt shingles — and its practical effect is a threshold most homeowners have never heard of:
- Repair up to 49% of the roof area: you may match the existing shingles even if they are not impact resistant.
- Repair or replacement of 50% or more: Class 4 impact-resistant shingles are required.
This is not an interpretation. Both options are printed as checkboxes on the city’s own roofing permit application, under the heading “asphalt roof repairs only”.
It matters after a hailstorm more than at any other time, because that is exactly when a scope lands somewhere near half a roof. If you live in unincorporated Larimer County rather than inside the city, the county sets the bar lower still: Class A fire rating everywhere, and both Class A and Class 4 required once a repair reaches 25% of the roof surface.
Tear-off, overlays and fire rating
The 2024 amendments rewrote the fire-classification rules and added a re-roofing exception worth knowing:
- Change your roof material and you trigger a Class A requirement. Going from asphalt to something else means a Class A fire-rated covering.
- Replace like for like — asphalt to asphalt — and the amended R908.1 allows the same materials and classification provided the replacement carries at least a Class C rating.
- Some materials are Class A automatically by their nature: brick, masonry, slate, clay and concrete tile, exposed concrete deck, ferrous and copper shingles or sheets, and metal sheets and shingles.
How far does the ice barrier have to extend?
Fort Collins amended R905.1.2 and states the figure plainly, which many jurisdictions do not:
- Not fewer than two layers of underlayment cemented together, or a self-adhering polymer-modified bitumen sheet in place of normal underlayment.
- It must extend from the lowest edges of all roof surfaces to a point not less than 24 inches inside the exterior wall line of the building.
- On a steep roof — 8:12 or greater — the barrier must instead be applied not less than 36 inches measured along the roof slope from the eave edge.
Two exceptions are written into the amendment: detached accessory structures with no conditioned floor area, and re-roofing where the existing roof covering has not been removed.
Worth knowing by contrast: the City and County of Denver does not require an ice barrier at all, and neither does unincorporated Weld County. This is genuinely local, and a crew that works mostly south of here may not expect it.
Decking: the 1/8-inch rule
The amended R905.2.1 requires asphalt shingles to be fastened to wood structural panels or solid lumber sheathing, and adds a specific tolerance: gaps in the solid decking shall not exceed 1/8 inch. On older Fort Collins homes with plank decking this is the line that decides whether the deck gets sheeted over before the new roof goes on — and it is far cheaper to plan for than to discover on tear-off day.
What inspections does Fort Collins require?
The city publishes a master list of every inspection type it offers, and there is no separate roofing or mid-roof inspection on it — a reroof is closed out under Final Building. If your contractor tells you to plan around a mid-roof hold in Fort Collins, ask them which inspection type they mean.
Scheduling: requests made before 11 p.m. are generally scheduled for the next business day, with arrival windows of 8 a.m. to noon or noon to 4 p.m. Inspections are booked through the city’s Citizen Access portal or by phone.
Does Fort Collins license roofing contractors?
Yes, and there are two separate classes — the difference matters if any part of your roof is low-slope:
| Licence class | What it covers |
|---|---|
| Roofing | Nonstructural roof covering and materials on roofs of at least 2:12 pitch, including replacement or repair of sheathing on existing roofs. Not permitted to work on flat or low-slope roof systems. |
| Roofing(+) | The same, plus flat and low-slope roof systems. |
Both classes require an ICC G14 certification and three verified completed projects. Every contractor also needs a City of Fort Collins business licence.
There is no public self-service tool to check a licence — the only way to verify one is to contact Contractor Licensing directly on 970-224-6165 or at [email protected]. It is a two-minute call and worth making before you sign anything, particularly after a storm when out-of-area crews arrive.
Fort Collins at a glance
| Question | Fort Collins’ answer |
|---|---|
| Permit required? | Yes, above 100 sq ft (one square) |
| Permit type | Fast-track — no plan review |
| Residential permit fee | $85, plus sales tax on valuation |
| Code edition | 2024 International Codes, from April 1, 2026, keyed to permit submittal date |
| Class 4 shingles | Required at 50% or more of roof area; optional up to 49% |
| Ice barrier | 24 in. inside the exterior wall line; 36 in. along the slope at 8:12 or steeper |
| Decking | Solid sheathing, gaps not over 1/8 in. |
| Fire rating | Class A on a material change; at least Class C like-for-like |
| Inspections | Final Building — no roofing-specific or mid-roof type published |
| Contractor licence | Required — Roofing, or Roofing(+) for low slope |
Where these rules come from
- Fort Collins Building Code — the 2024 adoption, its April 1, 2026 effective date, and the linked 2024 IRC Amendments document that contains the R902.1, R905.1.2, R905.2.1, R905.2.4.2 and R908.1 amendments quoted above
- Building Permits — the residential exemption, the fast-track roofing permit, the $85 fee and the permit application
- Building Inspections — the master inspection-type list and scheduling windows
- Contractor Licensing — the Roofing and Roofing(+) classes and their ICC G14 requirement
Fort Collins Building Services, 281 N. College Ave., Fort Collins, CO 80524 · 970-416-2740 · [email protected] · Monday–Friday, 8 a.m. to 5 p.m.
Verified against the City of Fort Collins’ published code amendments, permit pages and permit application on August 14, 2026. Note that the city migrated from fcgov.com to fortcollins.gov during 2026 and its older roofing documents no longer sit at their previous addresses, so older links you find elsewhere may redirect to generic landing pages. Codes change — four Front Range jurisdictions changed edition in 2026 alone — and we confirm current requirements for your address as part of every quote. See our Colorado and Wyoming roofing code overview for the other jurisdictions we work in, or the Longmont roofing code page for a jurisdiction with very different rules.
Fort Collins Roofing Permit Questions, Answered
Yes, unless the job is under 100 square feet. Fort Collins exempts roofing repairs of up to 100 square feet — one roofing square — per building, and requires a permit above that, so every full reroof needs one. Roofing is handled as a fast-track permit, meaning there is no plan review to wait on. The city also notes that permit exempt does not mean code exempt: a small repair still has to meet code even without paperwork.
The residential building permit fee is $85, and the commercial fee is $210. On top of that, city sales tax is calculated on the total valuation of the project — materials and labour combined. Because roofing is a fast-track permit there is no separate plan check fee.
Above half the roof, yes. The 2024 code Fort Collins adopted on April 1, 2026 added section R905.2.4.2 on impact resistance. A repair covering up to 49% of the roof area may match the existing shingles even if they are not impact resistant; at 50% or more of the roof area, Class 4 impact-resistant shingles are required. Both options appear as checkboxes on the city’s own roofing permit application. Note that unincorporated Larimer County, just outside the city limits, sets a stricter threshold: Class A fire rating everywhere, and both Class A and Class 4 once a repair reaches 25% of the roof.
Fort Collins amended R905.1.2 and publishes the figure. The ice barrier must be not fewer than two layers of underlayment cemented together, or a self-adhering polymer-modified bitumen sheet used in place of normal underlayment, and it must extend from the lowest edges of all roof surfaces to a point not less than 24 inches inside the exterior wall line. On roofs of 8:12 or steeper it must instead be applied not less than 36 inches measured along the roof slope from the eave edge. Two exceptions apply: detached accessory structures with no conditioned floor area, and re-roofing where the existing covering has not been removed.
Yes, in two classes. A “Roofing” licence covers nonstructural roof covering on roofs of at least 2:12 pitch, including replacement or repair of sheathing, but is not permitted on flat or low-slope roof systems. A “Roofing(+)” licence covers the same work plus flat and low-slope systems. Both require ICC G14 certification and three verified completed projects, and every contractor also needs a City of Fort Collins business licence. There is no public online lookup — to verify a licence, contact Contractor Licensing on 970-224-6165 or at [email protected].
The city’s published master list of inspection types contains no roofing-specific or mid-roof category, which means a reroof is closed out under Final Building. Requests made before 11 p.m. are generally scheduled for the next business day, with arrival windows of 8 a.m. to noon or noon to 4 p.m., booked through the Citizen Access portal or by phone. If a contractor tells you to plan around a mid-roof hold in Fort Collins, it is worth asking which inspection type they mean.
The 2024 International Codes, effective April 1, 2026, with local amendments. The trigger is the date the permit was submitted rather than the date the work happens — the city’s wording is that if your permit was submitted on or after April 1, 2026, the 2024 codes apply. A roof permitted in March 2026 and installed later is still a 2021-code job. Fort Collins locally amended several roofing sections, including R902.1 on fire classification, R905.1.2 on ice barriers, R905.2.1 on sheathing, the new R905.2.4.2 on impact resistance, and R908.1 on re-roofing.