One of the most common questions we get from Northern Colorado homeowners planning to finish a basement is: "Do I need an egress window?" The answer depends on how you plan to use the space — and getting it wrong can mean unpermitted work that causes problems at resale or during an inspection.
When Is an Egress Window Required in Colorado?
Under the International Residential Code (IRC), which Colorado and most Northern Colorado municipalities follow, an egress window is required in any basement room used as a bedroom or sleeping room. The purpose is life safety — occupants need a secondary escape route in case of fire.
Key point: if you're finishing a basement with an open family room, gym, home theater, or office — egress is not required by code (though window wells are still recommended for emergency access and natural light). The requirement triggers specifically when you designate a room as a bedroom.
Important Note on "Office" Rooms
Even if you call a room an "office," if it has a closet and is clearly usable as a sleeping room, inspectors in Fort Collins and other Northern Colorado cities may require egress. When in doubt, install it.
Colorado Egress Window Size Requirements (2026)
The IRC requirements in effect for Northern Colorado municipalities:
- Minimum net clear opening area: 5.7 square feet (or 5.0 sq ft for grade-floor openings)
- Minimum clear opening height: 24 inches
- Minimum clear opening width: 20 inches
- Maximum sill height from floor: 44 inches
- Window well (if applicable): Minimum 9 sq ft of clear area, 36 inches wide, 36 inches projection from wall
- Window well cover: Must be openable from inside without a key or tool
Note: "net clear opening" means the actual usable opening when the window is fully open — not the rough opening or glass size. Casement and single-hung windows typically meet egress requirements more easily than sliders.
How Much Does Egress Window Installation Cost in Northern Colorado?
Egress window installation involves cutting through a concrete foundation wall, which requires specialized equipment and careful waterproofing. Typical costs in the Fort Collins, Loveland, and Greeley area:
- Standard egress window installation: $2,500 – $4,500 per window
- With large window well excavation: $3,500 – $5,500
- Premium installations with covers and drainage: $5,000 – $7,000+
This cost is almost always worth it. A basement bedroom without an egress window can't legally be called a bedroom, which affects your home's appraised value and MLS listing square footage.
The Installation Process
Here's what the egress window installation process looks like when we do it:
- Assessment — We evaluate the foundation wall type (poured concrete vs. block), soil conditions, and ideal window placement
- Permits — We pull the required building permit from the city (Fort Collins, Loveland, Greeley, etc.)
- Excavation — Window well area is excavated to the required depth
- Cutting — Foundation wall is cut using a core saw; this is loud and dusty but done correctly takes 4-6 hours
- Window & well installation — Window frame is set, sealed, and waterproofed; window well is installed and secured
- Drainage — Gravel drainage layer is installed at the base of the window well to prevent water pooling
- Inspection — City inspection confirms the installation meets code
Egress Windows in Fort Collins, Loveland, and Greeley
Each Northern Colorado city has its own inspection process, but all follow the IRC requirements above. We're familiar with the permit process in each city and handle everything from application to final inspection.
Fort Collins inspectors tend to be thorough. Loveland and Greeley have their own quirks. We've navigated hundreds of permits across these cities and know what each inspector looks for.