average cost for single storey extension
You can expect to pay around Â£500 - Â£1650 per metre square for a single storey extension. A double storey extension can cost between Â£500 - Â£1500 per meter square.Planning costs can cost between Â£1000 - Â£27000, although the average price is around Â£5100. Basic conservatories cost around Â£500 per square metre to supply and fit.If the ground needs levelling this price will increase. double storey extension can cost between Â£500 - Â£1500 per meter square. Planning costs can cost between Â£1000 - Â£27000, although the average price is around Â£5100.