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Permitting Authorities / Colorado / Larimer County - Building Division

Do you need a permit to replace a roof in Unincorporated Larimer County, CO?

Adopted code

Larimer County - Building Division

Yes, a permit is required to replace a roof in Unincorporated Larimer County, CO, issued by Larimer County - Building Division. Re-roofing in unincorporated Larimer County requires a building permit; minor roof repairs not exceeding 100 square feet per building are exempt. Incorporated cities permit separately.

Roof code checklist: Unincorporated Larimer County, CO

ItemAnswerCode citeSourceVerified
Permit to replace a roofYeslarimer.gov2026-07-12
Repair permit thresholdPublishedroofing.pdf2026-07-18
Layer limit / roof-overNot published
Deck & sheathingPublishedroofing.pdf2026-07-19
Drip edgeYesroofing.pdf2026-07-18
Ice & water shieldYesroofing.pdf2026-07-18
Mid-roof inspectionNot published
Impact-resistant (Class 4) roofingYesroofing.pdf2026-07-18
Wind design criteriaPublishedroofing.pdf2026-07-19
Adopted codePublishedroofing.pdf2026-07-18
Contractor license / registrationYeslarimer.gov2026-07-12
Sales & use taxPublishedlarimer.gov2026-07-18

Each row comes from the sourced record on this page; full wording is in the table below. "Not published" means no official source for that item was found when the record was last verified.

Jurisdiction
Larimer County, Colorado (unincorporated)
Jurisdiction type
county
Address
Fort Collins, CO
Contact
  • url: https://www.larimer.gov/building
Permit portal
Permit portal
Roofing permit required
Required
Contractor registration required
Required
Registration details
  • license: Larimer County building contractor license (roofing classification) required to perform roofing work in the unincorporated county
Permit process note
Re-roofing in unincorporated Larimer County requires a building permit; minor roof repairs not exceeding 100 square feet per building are exempt. Incorporated cities permit separately.
Adopted code
2024 International Codes with Larimer County amendments — the county’s Roofing handout is footdated "Updated to 2024 I-codes 01/06/2026" and its 2024 Building Code Amendments ordinance carries the roofing amendments (county-wide ice barrier, Class 4 impact-resistance).
Drip edge
Required About drip edge
Ice & water shield
Required — "Ice Barrier (required county-wide). An ice barrier shall consist of not fewer than two layers of underlayment cemented together or a self-adhering polymer-modified bitumen sheet and shall extend from the lowest edges of all roof surfaces to a point at least two feet inside the exterior wall." Exceptions: metal panel roofs, membrane roof coverings, and detached accessory structures with no heated floor area; existing asphalt shingles with no ice barrier may receive a second layer of roof covering without adding an ice barrier. No elevation threshold is stated — the requirement applies countywide regardless of elevation. About ice & water barrier
Impact-resistant roofing
Required — "Class '4' impact resistant asphalt shingles are required for all new construction, repairs over 25%, and roof replacements." Added as IRC R905.2.4.2 by Larimer County's 2024 Building Code Amendments (exceptions exist for color/style-match unavailability and for repairs/additions not exceeding 100 sq ft).
Repair permit threshold
"Roof repairs of less than 1 square do not require a permit." (1 square = 100 sq ft.) Also: "Repairs less than 25% and additions less than 500 square feet in footprint are allowed to have a roof covering that matches the existing structure for fire and impact... Repairs to roofs or replacement of 25% or more of the roof's surface area will require the entire roof to be replaced and must be both Class A fire rated and Class 4 impact resistant."
Wind design criteria
"Much of Larimer County is a High-Wind Area (Ultimate Design Wind Speeds equals or exceeds 140 mph). Roof coverings must be rated for the site wind speed and attached per the manufacturer." The county's Roofing handout states this as a county-wide high-wind threshold rather than a single fixed design speed; exposure category, topographic effects, special wind region, and windborne debris zone are not stated.
Deck & sheathing requirements
The county's Roofing handout states: "Most roof coverings must be installed on solid sheathing, defined as having a maximum 1/8" gap."
Sales & use tax
3.95% combined for unincorporated Larimer County (state 2.9% + county 1.05%; not within RTD/SCFD). The county collects a building-materials use tax (1.05%) as an estimated deposit (assuming 50% of project valuation is materials) when a Larimer County building permit is issued.

Roof permits nearby: Larimer County

Berthoud, CORoof permit Estes Park, CORoof permit Fort Collins, CORoof permit Loveland, CORoof permit Timnath, CORoof permit Wellington, CORoof permit Roofing in ColoradoState hub

Related guides

Denver-Metro Roofing Permits Filing a Hail Insurance Claim Colorado Hail Season Prep Hiring a Contractor Hail-Belt Rules by State

The building permit authority for unincorporated Larimer County, providing permits, plan review, inspections, and code enforcement. Licenses building and roofing contractors working in the unincorporated county.

Hail reports near the center of Larimer County, CO

Reports, last 24 months
1
Largest, last 24 months
1.00 in Jun 29, 2025
Most recent
Jun 29, 2025 1.00 in
Reports, last 5 years
3
3 most recent reports, last 5 years
DateHail sizeDistance
Jun 29, 20251.00 in6 mi SSE
Aug 6, 20231.00 in6 mi SW
Jul 27, 20221.50 in10 mi SSE

Source: NOAA Storm Prediction Center severe weather database and daily storm reports (reports since the start of the current year are preliminary), within 10 miles of the center of Larimer County, CO. Data through Oct 7, 2026, not updated since. A report is an observation, not a damage record.

Working an insurance claim in Unincorporated Larimer County, CO? Everything on this page (drip edge, ice & water shield, inspections, Class 4 rules) formatted as a claim-ready evidence pack: verbatim ordinance quotes, code section cites, verification dates, and official source links, ready to attach to a supplement. See a real sample pack (PDF, 4 pages, free).

Code items like drip edge and ice & water shield are what adjusters ask you to document.

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Sources

Free instant roof estimate — Unincorporated Larimer County, CO

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Roofing questions: Unincorporated Larimer County, CO

Do you need a permit to replace a roof in Unincorporated Larimer County, CO?

Yes, a permit is required to replace a roof in Unincorporated Larimer County, CO. "Roof repairs of less than 1 square do not require a permit." (1 square = 100 sq ft.) Also: "Repairs less than 25% and additions less than 500 square feet in footprint are allowed to have a roof covering that matches the existing structure for fire and impact... Repairs to roofs or replacement of 25% or more of the roof's surface area will require the entire roof to be replaced and must be both Class A fire rated and Class 4 impact resistant."

Is ice & water shield required in Unincorporated Larimer County, CO?

Yes. "Ice Barrier (required county-wide). An ice barrier shall consist of not fewer than two layers of underlayment cemented together or a self-adhering polymer-modified bitumen sheet and shall extend from the lowest edges of all roof surfaces to a point at least two feet inside the exterior wall." Exceptions: metal panel roofs, membrane roof coverings, and detached accessory structures with no heated floor area; existing asphalt shingles with no ice barrier may receive a second layer of roof covering without adding an ice barrier. No elevation threshold is stated — the requirement applies countywide regardless of elevation.

Is drip edge required in Unincorporated Larimer County, CO?

Yes.

Do roofing contractors need a license or registration in Unincorporated Larimer County, CO?

Yes. Larimer County building contractor license (roofing classification) required to perform roofing work in the unincorporated county

What building code does Unincorporated Larimer County, CO use?

2024 International Codes with Larimer County amendments — the county’s Roofing handout is footdated "Updated to 2024 I-codes 01/06/2026" and its 2024 Building Code Amendments ordinance carries the roofing amendments (county-wide ice barrier, Class 4 impact-resistance).