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Permitting Authorities / City of Longmont - Building Inspection Division

Do you need a permit to replace a roof in Longmont, CO?

Adopted code

City of Longmont - Building Inspection Division

Yes — a permit is required to replace a roof in Longmont, CO, issued by City of Longmont - Building Inspection Division. A permit is required to reroof a house; repairs replacing less than 100 square feet of the total roof area do not require a permit.

Jurisdiction
City of Longmont, Colorado
Jurisdiction type
city
Address
Longmont, CO
Contact
  • url: https://longmontcolorado.gov/building-inspection/
  • telephone: 303-651-8332
Permit portal
Permit portal
Roofing permit required
Required
Contractor registration required
Required
Registration details
  • license: A City of Longmont contractor's license is required; roof covering and waterproofing work falls under a Class D-2 specialty contractor's license.
Permit process note
A permit is required to reroof a house; repairs replacing less than 100 square feet of the total roof area do not require a permit.
Adopted code
The City of Longmont has adopted the 2021 International Building Code and International Residential Code with local amendments; verify the current edition with the Building Inspection Division.
Drip edge
Required — Drip edge is required both eaves and rakes. About drip edge
Ice & water shield
Required — The City of Longmont does require Ice & Water Shield. Manufacturer's installation instructions and code must be followed; where in conflict the more restrictive applies. Roof slopes between 1/12 and 2/12, above non-habitable space, are permitted to use a bituminous membrane (ice and water guard) then asphalt shingles. About ice & water barrier
Mid-roof inspection
Required — Flat roofs only: "Ladders and mid-roof inspections are not required unless flat roof" (residential guidance) — no mid-roof for pitched asphalt-shingle re-roofs.
Impact-resistant roofing
Not required — Longmont does not require impact-resistant (UL 2218 Class 4) roofing. Ordinance No. O-2026-24, which repealed and reenacted Longmont Municipal Code chapter 16.06 to adopt the 2024 International Residential Code effective July 1, 2026, was reviewed in full, including its complete list of local amendments; the only roof-covering amendments are to IRC R908.1 (a roof with cumulative damage of 100 square feet or more must be replaced in its entirety) and R908.4 (roof recover), and no provision addresses impact resistance. The city's wind amendment sets a basic wind speed of 110 mph nominal / 142 mph ultimate, and its separately adopted Colorado Wildfire Resiliency Code (chapter 16.54) is a Class A fire-rating requirement; neither is an impact-resistance requirement.
Repair permit threshold
Repair of less than 10x10 (100 sq. ft.) is okay and no permit needed. The City of Longmont has a "1 square" rule (as of 2012): if more than 100 square feet of roofing requires repair or replacement, then the entire roof must be replaced, not just the affected roof area or plane (Longmont Municipal Code Amendment 16.06.300, IRC Section R908.1).
Roof layer limit / recover
"How many layers of roofing are allowed? Roofs are allowed to have only 1 layer of shingles." (Single Family Residential Re-roofs guide; commercial roofs are handled separately and allow up to two layers on low-slope built-up roofing.)
Deck & sheathing requirements
"Roof Sheathing Preparation (for complete tear offs): The roof sheathing must provide a rigid surface. Repair or replace all boards or sheathing which are warped, cracked or delaminated between supports."
Sales & use tax
8.865% combined (state 2.9% + Boulder County 1.335% + RTD/CD 1.1% + Longmont city 3.53%; parts of Longmont in Weld County have a different county component). Home-rule self-collected. Longmont collects use tax on construction materials at building permit issuance, at a combined city+county rate of 4.715% (3.53% city + 1.335% Boulder County use tax) applied to an estimated 50% of project valuation; contractors who always pull permits and pay use tax this way need not hold a separate city sales tax license.

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The building permitting authority for the City of Longmont, spanning Boulder and Weld counties. The Building Inspection Division issues reroofing permits, enforces the adopted building codes, and licenses building contractors.

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Roofing questions — Longmont, CO

Do you need a permit to replace a roof in Longmont, CO?

Required. Repair of less than 10x10 (100 sq. ft.) is okay and no permit needed. The City of Longmont has a "1 square" rule (as of 2012): if more than 100 square feet of roofing requires repair or replacement, then the entire roof must be replaced, not just the affected roof area or plane (Longmont Municipal Code Amendment 16.06.300, IRC Section R908.1).

Is ice & water shield required in Longmont, CO?

Required — The City of Longmont does require Ice & Water Shield. Manufacturer's installation instructions and code must be followed; where in conflict the more restrictive applies. Roof slopes between 1/12 and 2/12, above non-habitable space, are permitted to use a bituminous membrane (ice and water guard) then asphalt shingles..

Is drip edge required?

Required — Drip edge is required both eaves and rakes..

Is a mid-roof inspection required?

Required — Flat roofs only: "Ladders and mid-roof inspections are not required unless flat roof" (residential guidance) — no mid-roof for pitched asphalt-shingle re-roofs..

Do roofing contractors need a license or registration in Longmont, CO?

Required. A City of Longmont contractor's license is required; roof covering and waterproofing work falls under a Class D-2 specialty contractor's license..

What building code does Longmont, CO use?

The City of Longmont has adopted the 2021 International Building Code and International Residential Code with local amendments; verify the current edition with the Building Inspection Division.