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A concrete lintel inside makes sense, explains why it looks neat/straight from the inside. But agreed, I'll order the same size window. Thanks!

I'm going to attempt to install my first UPVC window, replacing an existing very old UPVC window. It'll be certified by building control. I know I need to measure from the outside and its brick to brick. The width is simple, brick to brick. But the height is a little difficult to measure. The...