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However, this figure has been bandied about for rather a long time now! From experience, Â£1,200 per m2 is a now a more realistic estimate for a house extension cost in 2015 and reflects price increases over the last few years. So, for your 4 x 5m extension, the build cost would be roughly Â£24,000.+ Add on 10-15% for professional fees (architect, planning application, building regs, structural engineer). + VAT. Single storey extension = Â£32,000.owever, this figure has been bandied about for rather a long time now! From experience, Â£1,200 per m2 is a now a more realistic estimate for a house extension cost in 2015 and reflects price increases over the last few years. So, for your 4 x 5m extension, the build cost would be roughly Â£24,000.
Summary: How much does it cost to build a house? Professional builders know the current cost to build a new home is $89 to $160 per sq ft, or more, depending on the homeâs size, design, quality, and location. These costs per square foot do not include the cost of land, financing costs, builderâs overhead and general expenses, marketing costs, sales commission, or profit.