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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.
Councils get submissions for house extensions regularly and have calculated the average costs. As a rough guide, expect to pay: Keep in mind that these are averages only. A timber ground floor extension in one home might cost $1000m2 and $1500 in another home.ast Updated: Topic: Home Extensions, Renovation Costs. The cost of house extensions can be cheaper than the cost of moving to a larger home and may even add more value to your home than their initial cost. However, there are significant costs involved, some of which may be budget busters if not anticipated.