Things You Will Need
Replacing standard window glass with unbreakable polycarbonate (Plexiglas), cutting back shrubs and having strong latches on the windows will help prevent entry. However, the best way to prevent a break-in in to install security bars (burglar bars) on your basement windows.
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Consider what you want your security bars to look like. You can get custom-made security bars/grills or opt for adjustable grills available at your hardware or home store.
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Determine where you want to place your security bars. You likely want to be able to open your windows, so, if your basement window opens inward, place the bars between the screen and the window. If your window slides you could put the bars on the inside of the window and still be able to open it.
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Measure your window opening and get the appropriate sized bars or security grills. Place your security bars in the window opening and mark where the fastening screws will go. Drill holes in the window frame for installation of the bars.
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Install the security bars. Use long screws to be sure the screws go all the way into the window framing (not just the casing).