Range from the cheapest single storey extension £38800 (London Quality Construction Group Limited based in BR2) to the dearest single storey extension £58000 (Silverland design & build based in BR1).
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 Greater London by posting a job with HaMuch and we will send it to extension builders in Greater London.
Job | Estimate |
Underpinning a house | £17370 |
Build a two storey extension | £87805 |
Build a timber frame extension | £25870 |
Install a swimming pool | £80870 |
Cost to build a single storey extension | £47395 |
Cost to build a side return extension | £36035 |
Install an RSJ | £2070 |
Build an outbuilding | £9870 |
Build a mansard loft conversion | £51870 |
Cost of a loft conversion | £32529 |
Build a kitchen extension | £41870 |
Build a hip to gable loft conversion | £41870 |
Build a granny annexe | £86870 |
Build a garden office | £9870 |
Convert a garage | £15870 |
Build a new garage | £18370 |
Build a flat roof extension | £21870 |
Build a dormer loft conversion | £41870 |
Lay a concrete foundation | £6120 |
Convert a bungalow loft | £28870 |
Basement conversion cost | £36035 |