Flat roof extension cost in W1S
A flat roof extension is a great way to add extra space to your home without splashing out on the costs of a pitched roof extension. Often exempt from planning permission rules, you can build a flat roof extension up to 3 metres in height as long as it's not visible from a road. But how much do they cost in W1S?
A flat roof extension ranges from the cheapest of £21840 (We Love Build - Three Arches based in W1J) to the dearest of £21944 (Elv8 Interiors based in W1B), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in W1S by posting a job with HaMuch. We'll send it to extension builders in W1S.
Estimates for common extension builder jobs in W1S;
| Job | Estimate |
| Underpinning a house | £17408 |
| Build a two storey extension | £87863 |
| Build a timber frame extension | £25908 |
| Install a swimming pool | £80908 |
| Cost to build a single storey extension | £48170 |
| Cost to build a side return extension | £36470 |
| Install an RSJ | £2108 |
| Build an outbuilding | £9908 |
| Build a mansard loft conversion | £51908 |
| Cost of a loft conversion | £32892 |
| Build a kitchen extension | £41908 |
| Build a hip to gable loft conversion | £41908 |
| Build a granny annexe | £86908 |
| Build a garden office | £9908 |
| Convert a garage | £15908 |
| Build a new garage | £18408 |
| Build a flat roof extension | £21908 |
| Build a dormer loft conversion | £41908 |
| Lay a concrete foundation | £6158 |
| Convert a bungalow loft | £28908 |
| Basement conversion cost | £36470 |