No such thing, just turn it round
Lol, hadn't thought of that
Might be the windows not straight, my experience of builders in that they struggle to make anything square. Also ^ lol.
I had the same conversation with the Mrs before I started - do you want it level with the celing, coving, window head / reveal or the floor - she thought I was taking the ****
You’ll be surprised how many are bent especially builders where it’s been rattling around in the back of a van, used for laying bricks one day then joinery the next.
I remember, many years ago, when labouring on site over school holidays and watching the bricky clean the cement mixer - get it started, bucket of water, chuck in a few bricks and bash the hell out of the drum with the spirit level