What is it about builders and spelling?
Not ‘extention’ or ‘extension’ this time – but ‘slabing’
“slab noun 1 a thick flat rectangular piece of stone, etc. 2 a thick slice, especially of cake. 3 an outer plank sawn from a log. verb (slabbed, slabbing) 1 to cut or make into slabs. 2 to pave with concrete slabs. slabbed adj.