| Scope | Estimated range |
|---|---|
| Window only (no cutting) | $700 – $1,900 |
| Cut into existing opening | $1,400 – $3,200 |
| Cut foundation + well | $3,000 – $6,100 |
| With drainage correction | $3,800 – $7,200 |
| Multiple units | $2,300 – $5,400 each |
Ranges reflect installed cost including materials and labor for typical residential work. The low end of each range corresponds to a basic vinyl configuration; the high end reflects premium frames, upgraded glazing, and larger units. Last reviewed 2026-11-12.
Egress requires a clear opening of at least 5.7 square feet, a minimum width of 20 inches, a minimum height of 24 inches, and a sill no more than 44 inches above the floor. Meeting those numbers often forces a larger window than the room would otherwise need.
A basement foundation wall is load-bearing. Cutting it requires engineering, a lintel or header, and inspection. In poured concrete this means core-drilling or saw-cutting plus rebar considerations; in block it means removing and re-heading courses.
A well must be at least 9 square feet of clear area, project at least 36 inches, and drain. Manufacturer wells run $300-900; formed or masonry wells cost more, and drainage corrections are the most common surprise.
Sometimes. The opening must already meet the 5.7 square foot clear opening, sill height, and width requirements, and the window must open fully without tools. Many existing basement windows fail one of those tests.
A ladder or steps are required when the window well is deeper than 44 inches. It must be permanently affixed and must not obstruct the opening.
It converts a basement room into legally habitable sleeping space in most jurisdictions, which is usually worth more than the cost. Appraisal treatment varies, so confirm with a local appraiser.