How to square a kitchen front when the wall isn't straight

The first thing is understanding the exact problem: it's not that the wall is "a bit off" everywhere — the angle changes gradually from one end to the other. You have to measure that angle at several points along the wall, not just at the start and the end, to know exactly how much it opens up in each stretch.

The goal isn't for the cabinets to copy the wall — it's the opposite: the front of every cabinet, the line you actually see, with the doors and drawers, has to come out perfectly straight and square at 90 degrees from one end to the other, using a laser level as the real reference instead of the wall.

To get that, every cabinet that sat against that crooked wall had to be individually trimmed at the back, on the part of the cabinet body that's hidden once it's installed. Each one needed a different amount trimmed off — a couple of centimetres, more on the ones closer to the end where the angle opened up further — because each cabinet touched the wall at a different point along that gradual drift.

The result is that the back of the cabinets, the part against the wall, follows the wall's actual uneven geometry exactly — every cut a little different from the one next to it — while the front, the part you see walking into the kitchen, comes out as one perfectly straight 90-degree line, with the doors and drawers all lining up with each other.