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Last update on January 31, 2026

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Avatar for Tri-State Basement Repair and Waterproofing, LLC
Tri-State Basement Repair and Waterproofing, LLC
3.2(
50
)
Egress Window - Install

Serving Lancaster, WI and surrounding areas

Approved

In business since 2006

Free estimates

Warranties offered

"Competent quality work with professionalism and great customer service."
Response time6 days
26 neighbors recently requested a quote
Recommended by88%of homeowners
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Egress Windows questions, answered by experts

Yes, you can install a bay window in an existing house. You’ll need to have a structural engineer draw up plans to add the necessary support to your exterior load-bearing walls and a general contractor to make the changes to the framing around the new wall opening. This will cost an average of $3,000. After that work is done, a window installer can set the new bay window in place.

Expect excavation below grade, creating a well for access, weatherproofing, and thorough inspections during setup.

Adding windows to a house is expensive. Budget roughly $5,800 to add a single window, and double or triple that to add two or three. In some cases, adding a single window can exceed $20,000, depending on the type of exterior wall, the size of the window, the type of window, local permit costs, and other factors.

DIY is possible for experienced individuals. Professional installation ensures compliance with building codes and proper sealing.

Egress windows are typically required for basements with habitable space or living quarters. Not all basements or lower levels require egress windows. However, egress windows are required in homes with living spaces such as bedrooms and living rooms in a basement. The International Residential Code and International Building Code require sleeping rooms to have a specific size egress window. Check your local building codes to confirm the requirements in your area.

The Lancaster, WI homeowners’ guide to egress window services

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