About to fit a new uPVC window into a new opening in a kitchen. Although I'm generally familiar with the process, I haven't fitted one myself before. Is the best way to level and fix the cill the wall first with frame fixings, and then the window to the cill using normal screws. Or fix the cill to the window first and then drill through both and fix to the wall with frame fixings? Been advised either method is valid, but would welcome some advice.
Thanks.
Thanks.