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How to mark and cut out electrical box holes.

One way is to mark the board using a pencil in a manner similar to the way you used the knife in the previous video and then cut the hole with your drywall saw. Here is the trick — Don't cut at 90º  – Angle your blade say 30º so the hole at the back of the board is bigger. That way the board slips over the box easily and if you are a little off you can trim the hole with your knife.

The boys at This Old House have a couple of their favorite ways to cut out holes. Let's see how they do it.

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