it will be 7m long, 4.4m wide with floor to wall plate height of 2.15m only 3 walls to be built as it will come of the existing garage end. 6" conc blocks, 30sqm for the sides, 10 for the end. @ wickes prices £1.20 per block @ 10psm = £480 1 bag of cement will do 35 blocks so rounded up to 12 bags £80 tops for cement for blockwork 5 bags of sand per bag of cement @ £1.18 x 60 = £70 priced up the roof trusses already - £1500inc if i want a room in roof for storage(which i do) plain clay roof tiles, i have about 45m2 of roof area so have reckoned i need 5000 tiles..quick ebay reckoning probably about £1K for the tiles 100mm floor slab, readymix 3cubes =£350 will prob go for trench fill foundations any advice on the costs/amounts of readymix?
At the start i thought i could accept a £10k bill for this, but have been quoted £20K by the builder that is already doing the extension on my house. I thought that as he was on site anyway he'd give me a good price...but looking at this breakdown i don't think he is...