Just in case you want to try tackling some replacement windows in brick openings yourself here's what we did in 18 or so simple steps. Actually, not so simple, but with the right tools it's not too bad. I'd rate it an intermediate DIY level - at least it is when you have brick openings rather than wood framed openings. We measured our rough opening from the outside which made it quite a bit harder to replace the window. The reason is that the inside of the brick rough opening is a few inches shorter than the outside. So we had to rip everything out, chip out enough of the brick and block in the way to make space for the new frame that fits the replacement window. There's not a ton of good information on the web about replacing windows in brick openings. Everything I found wasn't very detailed so hopefully this will help somebody else out. In the end using the larger rough opening allowed us to get a slightly larger window and a nice 4.5" window jamb that will better match the new windows we're installing in the addition. We're trimming all the windows out in a picture frame design so there's no window sill. We didn't save anything we ripped out other than the windows themselves so we weren't too gentle on removing all the pieces. Time: It takes us about 4 hours from start to finish to replace one window as we tend to only work on 1 or 2 at a time (tool setup and cleanup account for a decent amount of time). Tools: basic hand tools, demo bar, reciprocating saw, hammer drill, compound miter saw, angle grinder, and air nailer Start with one old window Tear off all the trim Once you remove the trim casing there will be a little strip of wood attached to the window. Remove this and the bottom window slides forward. Our top windows were held in place by this aluminum strip. Pull this off and the top window can be removed. Pull out top window. We had storm windows so those were able to be removed next. We did save the aluminum from the storm windows so we can recycle it, but they were only attached by a few screws. Sawzall the old frame and pry it out. Close up of what we were left with after demo. The inside brick and blocks sticks out a little further so that needs to be cut down. We measured and marked 4 inches from the interior wall and used an angle grinder to cut the line cleanly. Then followed up with a chisel to break up the rest. New window in place. We built a new frame out of 1x4 material, attached that to the brick using tapcon screws (that's where the hammer drill comes in handy), and then set the window in place. Our windows have 4 screws at each corner that simply attach to the new wood frame once you have it level and plumb. Trim the outside and then caulk it to make sure it's all water tight. We used 1x2 and 1x3 to trim this out. The brick sill was shaved down to make it ready for picture frame PVC trim. Outside is already water/air tight, but I like to add spray foam all around the window to better seal it up. We built the new jambs out of 1/2 inch plywood. Slide it in and tack it up ensuring it's level and plumb and more importantly the reveals around the window match side to side and top to bottom. I add a little more spray foam in the top and bottom once the jamb is attached. Cut and tack up the new trim casing. Putty the nail holes and caulk. Once you paint, you're done!