Windows and Doors Permit Requirements in Longmont, CO
Longmont is a city of 100,764 residents in Colorado that follows the 2021 IRC. Longmont is generally more lenient than the standard IRC when it comes to windows and doors projects, more exemptions and fewer permit triggers. You're looking at roughly $90 – $315 in permit fees, plan on about 2 weeks for approval, plus you can apply online.
By Joey, Founder · Last verified March 29, 2026 · How we research →
When you don’t need a Window & Door permit in Longmont
Replacing windows or doors in existing openings of the same size does not require a permit.
When you need a Window & Door permit in Longmont
Enlarging an existing window or door opening requires a building permit.
What Makes Longmont Different
Here's how Longmont's windows and doors rules stack up against the standard IRC baseline that most of the country follows.
Stricter Than the IRC
Enlarging an existing window or door opening requires a building permit.
1 rule match the IRC baseline, no surprises there.
Windows and Doors Permit Costs: Longmont vs. Nearby
Longmont's fees are right in line with the Colorado average, $90 – $315 versus $81 – $308 statewide.
| City | Estimated Fee |
|---|---|
| Longmont | $90 – $315 |
| Denver | $100 – $400 |
| Colorado Springs | $100 – $350 |
| Aurora | $90 – $360 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Longmont permit costs →
Zoning & HOA Considerations
If you live in an HOA community: hOAs in some communities regulate exterior window styles, frame colors, and door designs. Changing window types or adding new openings may require architectural review approval.
Estimated Project Timeline in Longmont
Here's a typical timeline for a windows and doors project in Longmont, CO:
Timeline is based on Longmont's typical about 2 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
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Frequently Asked Questions
Estimated permit fees for Windows and Doors projects in Longmont, CO range from $90 – $315. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Windows and Doors projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Longmont can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for Windows and Doors permits in Longmont is about 2 weeks. More complex projects may take longer if plan review is required.
If you live in an HOA community, you may need architectural review approval in addition to a building permit. HOA rules and city building codes are separate, you may need to satisfy both. Review your CC&Rs and submit to your HOA's architectural review committee before starting work.
Learn More About Windows and Doors Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Windows and Doors Guide →