If you have a 2 X 6 framed wall, you probably have a thickness (or jamb depth) that is 6.5 inches, that typically includes the 5.5 inches from the frame, a half inch for interior drywall and a half inch for exterior plywood. Don't make assumptions on this though, the age of your home, and whether there were any additions make after the home was built could mean different interior and exterior sized materials were used. Some homes built in before the 1950s or 1960s have three-quarter inch shiplap on the outside, and possibly plaster on the inside instead of drywall. This measurement is critical in order for the window supplier to build a window that fits perfectly, or for you to find an off-the-shelf window you know with work as a replacement. If you aren't sure, you can measure from the place in where you exterior plywood should start to the place where the backside of your interior starts. That should give you a fairly good starting point.
When you're confident you have an accurate depth measurement, you can head outside to measure the width, including the frame. (You may want to subtract one-eighth inch to give you a bit of wiggly room.) Depending on what type of window you are replacing you may have to cut around the existing window and this will leave a slightly bigger opening than is required when you can simply extract the unit by removing nails and screws. Next measure from the top to bottom, …show more content…
Knowing you can go back with a different style or shape adds value and allows you to really get the look and feel you want. You can't put a price tag on the feeling that comes from knowing you can easily switch some fixed windows for awning or hopper style windows in the rooms that need a little more ventilation or reconfigure casement windows to open from the or right hinges. Improving comfort, bringing in more natural light and loving the way your home looks and feels aren't as easy to measure as the jamb depth, which is a bit