measure height from floor to ceiling then width of walls.
i.e. (h)2.4metres..x..(w)1.8m..=4.32m
do all four walls then add all.
just add bath/door/window area to,this will be your "extra" m2 about 2-3 m2.
any boxes left "unopened" take back and get money back,but keep some for spares/repairs.
when buying tiles ensure that they have all got the same batch number on the side of boxes.
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