Replacing an existing window is the easiest method and, quite probably, the most frequently used.
WIDTH. All around your present window is a beading. Put your measure tape behind the rounded bit and measure to the same point on the other side. As a double check, measure the width of the sash itself. If you’ve got the right measurement the sash width will be about 6-10 mm less.
HEIGHT. Height is taken slightly different. At the top of the window you will once again find beading. This is the starting point of your measurement. You need to measure beyond the bottom bead until you reach the underside of the cill. The only complication is that there will possibly be a window board attached to the cill. Just measure to it and then measure the board itself, add two numbers together and you will have the result.
Replacing a missing window is the easiest way of doing a box frame survey because the window is not on the way but there are still some double checks to make.
In a traditional set up, the window reveal will be bigger on the inside than the outside, as a rule of thumb, the inner reveal will be about 80-100 mm greater all-round than the outer opening. Sometimes occasionally you might find the existing opening doeasn‘t match the outline perfectly, for example, the outer stonework might have an arched feature or the box frame might not sit flush with the intrnal plaster. Don‘t worry, we had thousands of such cases, just send us the photos and we will be able to advice the best way of making a suitable window for your house.
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