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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.
Building costs for house extensions or home renovations can vary considerably depending on a number of criteria: However, considering that planning permission and drawings from start to finish wil usually wind up at about Â£1,500 give or take some, the prices below will give you the averag costs for a house extension.The rest is up to you and your preferences in the refurbishment of the interior. And finally, there is the point of location, location, location. 2  For example, a House Extension in London may cost more than a House Extension in Manchester, only because the cost of building is greater in London than in the North West.