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Yes, installing egress windows usually requires a building permit because they affect your safety in the home. If you need to dig or replace a well, you may need extra permits for excavation. Call your utilities, plumbing, and telecommunications providers in advance. They can help you find the underground lines so you don't accidentally cut into one.

On average, installing an egress window takes around three full days. Add an extra day or two for excavation, wall cutting, and window remodeling services. These time estimates assume that your preferred window is readily available and doesn’t require custom sizing or other changes.

You may need to install a window well cover. Covers help keep out debris and water, reducing the risk of flooding and other damage. On average, installing a window well cover costs $700, but costs vary depending on the size and complexity of the project. For safety, test that the egress window and the well open easily and fully.

The International Residential Code requires one egress window in each sleeping space in your basement. For greater safety, convenience, and natural lighting, you may choose to install one in other below-grade living areas. Always check with local authorities and regulatory bodies about specific rules in your area.

Basement egress windows need a tight seal with no gaps because their location makes them prone to flooding and water damage. Weatherstripping costs about $105 per window and can help prevent leaks. Use a material that allows you to open and close the window easily.

Unfortunately, black mold is common with basement egress windows based on their location. Stopping black mold from forming around an egress window usually requires finding and fixing a water leak, which is the most common cause of mold formation. Water damage repair costs $1,250 to $5,200, depending on severity and the project.