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Hi i can fit it from the inside then it will but up to the back of the external reveals, I'm replacing old wood windows add it a pic don't know it that helps

Yes i am installing myself i have measured external as I should and that will look great from the outside, but then there will be a 40 mm gap to the internal reveal from the edge of the window each side

Hi i am looking for some advice as to fitting windows for the first time I've come to a problem , I measured the external opening size and it is 910 mm wide ,The internal width is 1m so should I buy a 900mm window and add a 40mm extender to each side ,or is there another way thanks any advice be...