Basement Egress & Foundation Cutting for Basement Finishes
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Basement egress work means cutting or enlarging a foundation opening, setting a code-sized window, and installing a well, plus a ladder when the well is deep.
What it involves
Cutting or enlarging a foundation opening, setting a code-sized window, and installing a well, plus a ladder when the well is deep.
Code basics
Min. 5.7 sq ft net clear opening (5 sq ft at grade/below grade), 24 in clear height, 20 in clear width, sill no more than 44 in (Arapahoe County / IRC 2021 R310). Full details: code guide.
Permits
Denver requires a permit for new egress windows (source). Landmark/historic properties also need design review (source).
Related guides
- Egress window check: see if your window and well likely meet the minimums Choosing the opening? Compare egress window or egress door and cost by window type, or see egress window installation. Before we cut, learn is an egress opening required, why it's one opening per basement bedroom, and the cover types for the new well.
FAQ
- How much does it cost? → cost guide
- Do I need a permit? → Yes in Denver; see the code guide.
Frequently asked questions
What does basement egress and foundation cutting involve?
Cutting or enlarging a foundation opening, setting a code-sized window, and installing a well, plus a ladder when the well is deep.
What size opening does the cut need to produce?
At least 5.7 sq ft net clear opening (5 sq ft at grade/below grade), 24 in clear height, 20 in clear width, with a sill no more than 44 in above the floor (IRC 2021 R310, as restated by Arapahoe County).
Do I need a permit in Denver?
Yes. Denver requires a permit for new egress windows, and landmark or historic properties also need design review.