Foundation wall opening
The wall is cut to the required size with temporary support and a header appropriate to the wall material and the load above.
Code-compliant escape openings · Greater Burlington
Egress window installation: basement bedrooms and finished space
An egress window is a legal escape opening for a below-grade room. Adding one means cutting the foundation wall, setting a properly sized window and well, and giving that well somewhere to drain, so a safety upgrade does not become the next water problem.
No phone call needed.
What this service includes
A basement bedroom generally needs an opening a person can escape through and a firefighter can enter through. Adding one to an existing foundation involves cutting concrete or masonry, installing a header, setting the window and well, and draining the well. Vermont's frost depth and snow load make the well drainage and cover the parts most often underbuilt. Confirm the required dimensions with your local code official before the wall is cut.
Common reasons homeowners call
Problems this service can fix
A basement bedroom with no exterior door or escape window
Finishing a basement into sleeping space
An existing window too small or too high to climb through
A window well that fills with water, snow or leaves
A real-estate or appraisal note about a non-conforming bedroom
Daylight and ventilation wanted in a dark lower level
Repairs and systems
Repairs and systems
Egress window unit
A casement, sliding or in-swing unit is selected to meet the required clear opening, sill height and operation without special tools or keys.
Window well and ladder
The well is sized for the opening and fitted with a permanent ladder or steps where depth requires one.
Well drainage
A drain connects the well to the footing drain, a dry well or another outlet so the well cannot become a basin against the new opening.
Cover and grate
A load-rated, escapable cover keeps out rain, snow and debris while remaining openable from inside the well.
Interior finish and restoration
Framing, insulation, trim and wall finishes around the new opening are restored as part of the project.
Matching the option to the condition
Egress window parts and why each matters
An egress window is a system, not just a window. The parts below all have to work together.
| Component | Purpose | What to confirm first |
|---|---|---|
| Foundation wall opening | Creates the opening safely | Structural support over the opening |
| Egress window unit | The exit and light | That it meets the requirement for the room |
| Window well and ladder | Space to exit | Size and access |
| Well drainage | Keeps the well from filling | A connection to drainage |
| Cover and grate | Keeps debris out | That it can be opened from inside |
- 01
Wall material, thickness and reinforcement
- 02
Depth below grade and the resulting well size
- 03
What the wall carries above the proposed opening
- 04
Where the well can drain, and whether a footing drain exists
- 05
Utilities, meters, decks, walks and plantings in the way
- 06
Local requirements for the room's intended use
Your estimate
What is included in the plan
Confirm the requirement first
Required clear opening, sill height and well dimensions come from the code your town enforces, and get that confirmed before anyone cuts a foundation wall.
Drainage is not optional
An undrained well beside a new opening collects roof runoff and snowmelt against the one part of the wall you just cut through.
Structural support
Removing a section of a load-carrying foundation wall needs a header and temporary support, and that is engineering, not trim work.
Winter reality
Snow drifts into wells and freezes, and a cover that sheds snow and can still be pushed open from inside matters more here than in a mild climate.
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Compare the complete egress window installation scope.
Sources and Vermont specifics
What the residential code requires of a basement escape opening
The model International Residential Code requires basements to have at least one operable emergency escape and rescue opening, and requires one in each sleeping room. The opening has to open directly to a public way, or to a yard or court at least 36 inches wide that opens to a public way, and it has to work from inside without keys, tools or special knowledge. The commonly cited minimums are a net clear opening of 5.7 square feet, at least 24 inches high and 20 inches wide, with a sill no more than 44 inches above the floor.
Those minimums are why an ordinary replacement window will not always qualify, and why the well outside matters as much as the sash. Confirm with the local code official which edition applies to your town, and ask the installer to state the net clear opening and the well dimensions in the scope. Water control belongs in the same conversation, because a new well below grade is a new place for water to collect.
Sources: International Residential Code R310.1, emergency escape and rescue opening required (UpCodes). Checked September 26, 2026.
Common questions
Egress Window Installation FAQs
Does every basement bedroom need an egress window?
Below-grade sleeping rooms generally require a second means of escape, which is usually an egress window or a walkout door. The exact requirement and how it applies to an existing home is determined by the code your town enforces, so confirm it with the local official before planning the work.
Can an egress window be cut into a stone or block foundation?
Often yes, but the method differs from poured concrete. Stone and rubble walls may need rebuilding around the opening and a header sized for a less predictable wall. That evaluation happens on site before a price is meaningful.
Will an egress window make my basement leak?
It should not, provided the well is drained and covered. The risk comes from adding a well with no outlet: it collects roof runoff and snowmelt directly against a new opening. Drainage and the cover are part of the installation, not upgrades.