Mounting a Recessed Medicine Cabinet in an Exterior Wall

Mark the location of the studs in the wall using a stud finder and a pencil. Hold the medicine cabinet up to the wall so it sits with a wall stud running through the middle of the cabinet and trace the perimeter of the cabinet on the wall.

Cut into the wall along the lines you traced and then remove the drywall from the cutout. Saw through the wall stud in the cutout at the perimeter of the cutout, removing that portion of the stud.

Measure and cut wood blocks that have the same width as the depth of the cutout and that fit around the perimeter of the cutout, under the drywall. Drive screws through the edge of the drywall around the cutout and into the wood blocks to hold them in place.

Slide the medicine cabinet into the cutout you made in the wall. Drill guide holes in the sides, top and bottom of the inside of the medicine cabinet and into the wood blocks. Drive wood screws through the guide holes so the screws hold the medicine cabinet firmly in place.