Flat roof extension cost in EN1
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 EN1?
A flat roof extension ranges from the cheapest of £21816 (Colin Lynch Builders based in EN3) to the dearest of £21944 (AL Plumbing & Electrical based in EN1), 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 EN1 by posting a job with HaMuch. We'll send it to extension builders in EN1.
Estimates for common extension builder jobs in EN1;
| Job | Estimate |
| Underpinning a house | £17387 |
| Build a two storey extension | £87831 |
| Build a timber frame extension | £25887 |
| Install a swimming pool | £80887 |
| Cost to build a single storey extension | £47747 |
| Cost to build a side return extension | £36233 |
| Install an RSJ | £2087 |
| Build an outbuilding | £9887 |
| Build a mansard loft conversion | £51887 |
| Cost of a loft conversion | £32694 |
| Build a kitchen extension | £41887 |
| Build a hip to gable loft conversion | £41887 |
| Build a granny annexe | £86887 |
| Build a garden office | £9887 |
| Convert a garage | £15887 |
| Build a new garage | £18387 |
| Build a flat roof extension | £21887 |
| Build a dormer loft conversion | £41887 |
| Lay a concrete foundation | £6137 |
| Convert a bungalow loft | £28887 |
| Basement conversion cost | £36233 |