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Window wells. Steel window well cover. Plastic window well cover.
If the bottom of your window is below the adjacent ground, as in basement windows, you will need a window well. The most common type is the pre-manufactured corrugated metal window well. Sometimes they are constructed of materials such as concrete, concrete block or pressure treated lumber.
There should be at least a few inches of space between the basement window sill and the surrounding soil. If it is less it is recommended to install a window well to prevent wood rot and water seepage into the basement. Corrugated steel window wells are inexpensive and easy to install but care should be taken not to damage the foundation's waterproofing. It may be a good idea to add even more waterproofing before installing the well. Where possible, each window well should have a gravel filled drain pipe connected to the weeping tiles for better drainage. Window wells in older homes are mostly made of poured concrete. Window wells should be filled with gravel up to 3" (75 mm) below the window sill and kept free of debris. Accumulated debris will prevent proper drainage to the weeping tiles which could result in water backing up in the well and leaking into the basement.