Flat roof extension cost in W1A
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 W1A?
A flat roof extension ranges from the cheapest of £ ( based in ) to the dearest of £ ( based in ), 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 W1A by posting a job with HaMuch. We'll send it to extension builders in W1A.
Estimates for common extension builder jobs in W1A;
| Job | Estimate |
| Underpinning a house | £15500 |
| Build a two storey extension | £85000 |
| Build a timber frame extension | £24000 |
| Install a swimming pool | £79000 |
| Cost to build a single storey extension | £10000 |
| Cost to build a side return extension | £15000 |
| Install an RSJ | £200 |
| Build an outbuilding | £8000 |
| Build a mansard loft conversion | £50000 |
| Cost of a loft conversion | £15000 |
| Build a kitchen extension | £40000 |
| Build a hip to gable loft conversion | £40000 |
| Build a granny annexe | £85000 |
| Build a garden office | £8000 |
| Convert a garage | £14000 |
| Build a new garage | £16500 |
| Build a flat roof extension | £20000 |
| Build a dormer loft conversion | £40000 |
| Lay a concrete foundation | £4250 |
| Convert a bungalow loft | £27000 |
| Basement conversion cost | £15000 |