What basement window replacement costs

The question splits in two, and most cost pages answer the wrong half. Swapping a basement window for another one of the same size is a small job. Turning an opening into a legal exit is a different job entirely, and the gap between them is the whole story.

First, which job is yours

Same opening, or a legal exit?

If the opening stays as it is and you are replacing a tired window with a new one, you are buying a unit and setting it. If the room is becoming a bedroom, or you want it to count as one, the window has to meet egress code, which usually means a bigger opening, a well, and drainage.

The second job costs several times the first. Any page that gives you one number for “basement window replacement” has quietly picked one of the two for you.

Which job is mine?

A large basement window looking out onto trees at ground level — Photo: The Great Egress Co.

Same opening, new window

The unit is the honest part of this number.

Basement window units that are not egress rated are published at a flat price. These are the two in the catalog we track, both at the same price.

Side Hinge Basement Window $500 Reverse Hopper Basement Window $500

Affiliate links. They cost you nothing extra and they do not change what we write. Prices read from the manufacturer on 2026-08-30.

What we cannot tell you yet

Nobody in our data publishes a labor price for a plain swap.

We have found 2 published prices that mention replacement work. Read the source page before planning around any of them.

So we are not going to invent an average. If you want that number, call three installers and ask; what we can tell you is what the window itself costs, and what the bigger job costs when the opening has to change.

The other half of the question

If it has to become an egress window.

Here the data is solid, because installers advertise this work. These are prices published by the companies themselves, each one named and dated.

The window, bought direct

$500–$1,000

Manufacturer list price across 5 models, 3 of them code-compliant for egress.

See which models clear egress code

The job, done by a contractor

$2,500–$20,000

26 prices published by 9 installers across 7 states, each one named and dated.

See every published price

One thing worth checking first

A bigger window is not always a bigger bill.

If the existing opening is already close to the code dimensions, the upgrade can be much cheaper than the ranges above, because the expensive part is cutting the foundation. Measure the opening you have before you assume anything.

What the code requires

A basement kitchen with two windows set high in the wall above the counter — Photo: The Great Egress Co.