Tommy is correct you will need to frame the inside space with some wood maybe some strips of 3/4 pine then trim with molding.
Download How To Frame Around A Basement Window
Images. Best vinyl basement windows, image source: There are many ways to frame around a basement window.
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How to install a basement window ~ in masonry. Looking for help on a window framing question. Since i had a nice plumb wall to measure from, this method worked really well.
However, your basement windows might be just a bit above ground or have a coping that keeps the dirt before opening the windows in your basement, clear debris from outside the window so that there are the window has hinges on the bottom of the frame that allow the window to pivot inward.
By todd fratzel on framing. Best vinyl basement windows, image source: We'll show you how to dry a wet basement. You can choose to frame as close to the pole as possible by cutting ΒΌ circles out of the four boards making up.