Roofing in Longmont

Longmont sits at about 4,980 feet on the plains, northeast of Boulder and a few miles out from the foothills. It's mostly in Boulder County, but it runs its own building department with rules that are stricter than many neighbors' in a few ways: no overlays, a required ice barrier, and a rule that pushes partial jobs into full replacements. It also adopted the 2024 codes and the state wildfire code as of July 1, 2026.

If your address is outside city limits, Boulder County's or Weld County's rules apply instead. Here's what applies inside Longmont as of October 2026.

Hail in Longmont

We counted every day with at least one hail report of 1 inch or larger within 5 miles of central Longmont, using NOAA's Storm Events Database from April 2010 through July 2026.

Longmont's hail came in clusters. Eight of its 12 days fell in 2018 and 2019, with four each year, and two more came in May 2023. A run of quiet years in between is normal, not a sign the risk has passed. Longmont's count of 1-inch hail days ranks 17th of the 18 Colorado cities in this guide (see hail by city).

NOAA's records come from spotters and the public, so they miss storms nobody reported and can't tell you what hit your roof. Treat them as a reason to look closer. To see reports near your own address, check your exact address, and see hail size and damage for what each size tends to do.

Permits and inspections

The City of Longmont's Building Inspection division issues roofing permits. Longmont lists the 2024 International Codes, the 2024 Metro Cohort Model Code and the 2025 Colorado Wildfire Resiliency Code as adopted as of July 1, 2026, on its building codes page. Its roofing guidelines set these rules for homes:

• Permit: repairs under 100 square feet need none. If more than 100 square feet needs repair or replacement, the entire roof must be replaced, not just the affected area or slope. The city cites its local amendment to section R908.1.
• No overlays. Asphalt roofs with multiple layers must have every layer removed.
• Ice barrier required. Where the manufacturer's instructions and the code differ, the stricter one applies.
• Drip edge at both eaves and rakes.
• Wind: shingles must be classified for 110 mph sustained wind, and plain three-tab shingles generally aren't allowed except on detached non-habitable buildings.
• Rusted, damaged or deteriorated flashings, edgings and vents must be replaced.
• Ventilation is required unless the roof is a closed, unvented assembly with condensation control.

The whole-roof rule is a big deal after a hail claim. If an adjuster approves only one slope, the permit may still require a full replacement. Tell your insurer early, and read insurance in plain English on how code upgrades are paid.

Ladder and mid-roof inspections aren't required unless the roof is flat, per the guidelines. Longmont's older reroof handout (2013) says the permit holder must call for the final inspection and that tile, metal and special roofs may need a mid-roof. Inspectors can do the final without you home if there are no dogs in the yard and they have access; tape the permit card to a front door or window. Schedule through the city's permits and inspections portal, or call Building Inspection at 303-651-8332.

Who can do the work

Colorado has no state roofing license. Longmont licenses roofers under Class D-2, roof covering and waterproofing, one of its specialty contractor licenses. Class D licenses don't require a test, but the city requires general liability insurance of at least $1,000,000 per occurrence, with the city named as certificate holder.

You can act as your own contractor without a license only if the home is your primary residence when you apply, and it isn't a rental or bought to flip. We didn't find a public license lookup. Call the city's Help and Information Line at 303-776-6050 to confirm a roofer's license. Our roofer checklist covers insurance, workers' comp and the state business search.

Class 4 and wildfire rules

As of October 30, 2026, we found no Class 4 requirement in Longmont's published roofing rules. Unincorporated Boulder County's Class 4 rule doesn't apply inside the city. Class 4 is still worth pricing; it's a lab rating, not a hail warranty, so read Class 4 shingles first.

Longmont has adopted the 2025 Colorado Wildfire Resiliency Code. Where it applies, replacing a roof covering, or 25% or more of the roof, generally means the whole roof must meet the code's roof rules, starting with a Class A rating, according to the state's Division of Fire Prevention and Control. The code covers only areas on the state's wildfire map. We didn't find a Longmont map showing which addresses are included, so ask Building Inspection whether your home is in a mapped area.

HOAs and historic properties

Many Longmont subdivisions have HOA covenants on roof color and material, and the city permit doesn't replace HOA approval. If your home is a designated landmark or in a historic district, ask the city about exterior review before changing materials. Our guide to HOA and townhome roofs covers who decides what.

Finding your roof's history

Search your address in Longmont's permits and inspections portal. Because almost any roof job over 100 square feet means a full replacement under a permit, a reroof done the legal way should be on file. Our roof age guide covers other ways to date a roof.

Local resources

• Longmont roofing guidelines, Building Inspection, 303-651-8332
• Permits and inspections portal
• Contractor information, Help and Information Line, 303-776-6050
• Adopted building codes
• Boulder County Assessor (or the Weld County Assessor for the part of Longmont in Weld County)
• BOCO Alert emergency notifications

Common questions

Does Longmont require Class 4 shingles?

We found no Class 4 requirement in Longmont's published roofing rules as of October 30, 2026. Unincorporated Boulder County requires Class 4, but that rule doesn't apply inside Longmont city limits.

Can I patch part of my roof in Longmont?

Only small repairs. Longmont's roofing guidelines say repairs under 100 square feet need no permit, but if more than that needs repair or replacement, the entire roof must be replaced, not just the damaged area or slope.

Can a roofer lay new shingles over my old roof in Longmont?

No. Longmont doesn't allow overlays, and all existing layers of an asphalt roof must be removed.

Can I reroof my own house in Longmont?

Yes, if it's your primary residence when you apply and it isn't a rental or a flip. You can pull the roof permit without a contractor license as long as no contractor does the work.