Range from the cheapest installation of a downstairs guest toilet £650 (MJM Plumbing & Property Maintenance based in SW1V) to the dearest installation of a downstairs guest toilet £1650 (LUCO - London Utility Company based in W1W).
Comparing bathroom fitters 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 install a downstairs toilet in Mayfair by posting a job with HaMuch and we will send it to bathroom fitters in Mayfair.