Tips From a Pro; How To Patch a Hole In Drywall Decorating & Design, Home Office Step 1 Mark the hole with a straight edge approximately 1/2 – 1″ beyond the damaged area. Tip – Make sure to mark the area as uniformly square as possible. Meaning the top and bottom width are the same and the top to bottom height are the same. Pages: 1 2 3 4 5 6 7 8 9 10