How to Cut a Window in a Stucco Wall

Measure the new opening and mark your cut lines with the chalk line so you have a guide.

Drill holes at the four corners of the square opening you've drawn on the wall.

Score along the lines with the chisel and hammer to make a neat break in the stucco.

Use a power saw fitted with a masonry blade to cut into the stucco to a depth of about ¾ inch. This should also cut into the metal lath used to support the stucco. You can make a series of shallow cuts until the blade hits the metal lath and you see sparks.

Chisel or hammer the plaster away from the wall so that you reveal the metal lath and building paper or weather resistant membrane beneath. Use the pry bar if it helps to grab and pull the stucco toward you.

Cut the sheathing on the house after you've finished removing the stucco to finish the opening. Remember there will be studs behind this and you should address the drywall or plaster walls from inside the house.