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Open the interior wall first to make sure you don't have wiring or Plumbing that will interfere with the process. Make a mark on the exterior wall with a wax pencil to mark exactly where you will cut. Make sure to measure the RO or "rough opening" on your window or door. You will want the RO to be just a little larger than the actual window size. Most windows or doors come with instructions that give you a suggested RO. Unless you're experienced, stick to the suggested RO. If the interior wall is exposed to the house or building, you may want to consider taping a plastic sheet up because cutting through brick is EXTREMELY noisy and messy. If you have insulation in the wall, this should be removed before cutting through. I usually rent a concrete saw. Most of these are really monsters, so make sure you have the strength to handle one of these and make a pretty straight cut. If you have any doubts, ask the staff at the rental place to set you up with the proper blade. The ones I use are diamond edged and they're very expensive, so make sure you get the insurance coverage if you think you might have an accident and drop one. They're about $80, if I remember correctly. Use a respirator mask, not just a fiber mask. The brick dust is seriously nasty once it gets up your noise. Also make sure to use heavy leather gloves, a dew rag (bandana) and goggles or safety glasses. SAFETY FIRST. I almost always have a ladder ready to make sure I have proper leverage to make the cut. Remove anything from the exterior/surrounding area that you don't want trashed. Again, brick dust is nasty stuff and it will coat everything....cars, cats and canoes. Finally, make your cuts deep enough. Most brick is about 3 inches thick. Cinderblock walls are different animals completely because you'll have to cut then chop. Cinder walls are hollow in the middle, remember. Make your cuts from top to bottom and remember that if you're cutting away a large section of wall, you will need to be prepared to build some kind of a supporting structure to hold that wall until you have steel, aluminum or wooden headers in place. Most windows, unless they're extremely wide, won't remove enough brick to cause a collapse, but better safe than sorry. If you have any doubts about structural integrity, let a pro do it. Once your header's in place, you should insulation the hollow places in the cinderblock. Then install your window, point up more insultation into the nooks and crannies or use GREAT STUFF...it expands to fill in the cracks. The rest is aesthetics.

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Q: How can you cut a new window in a concrete block wall?
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