Permitting Authorities / 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.
Jurisdiction
Larimer County, Colorado (unincorporated)
Contact
- url: https://www.larimer.gov/building
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).
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 barrierImpact-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.
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.
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