Measure the width at the top, middle and bottom, and the height on the left, centre and right. Keep the largest width and height. Measure only the surface to be covered, from the ceiling to the top of any skirting board that will remain.

Draw a simple plan showing doors, windows, sockets and switches, measured from the same reference corner. Do not automatically subtract openings: the full composition needs to remain continuous around them. Consider furniture and the position of the main subject when choosing your crop.

Enter the wall dimensions without allowances. In the prototype, 3 cm added to each side turns a 300 × 250 cm wall into a 306 × 256 cm order. This installation allowance is separate from the 3 mm production bleed. The workshop must approve these settings.

Measure a second time before approval. Sloping, curved or multi-face walls require a review of the plan. Keep the dimensions and selected crop together so the workshop can check the same project.