Range from the cheapest single storey extension £51,800 (Pillar Contractors Ltd based in W1K) to the dearest single storey extension £53,880 (We Love Build based in W1J).
Comparing extension builders estimates for fitting a downstairs toilet gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to build a single storey extension in Mayfair by posting a job with HaMuch and we will send it to extension builders in Mayfair.
