Range from the cheapest single storey extension £51,960 (FLAVIA CONDE based in WC1N) to the dearest single storey extension £79,000 (Q Lofts and Extensions based in EC1R).
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 Russell Square by posting a job with HaMuch and we will send it to extension builders in Russell Square.
