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Select your affordable City Of Westminster extension builder
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in City Of Westminster. No obligat...
Mick Singh
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
Ali Alagoz
Propello is an established and experienced local extension builder in City Of Westminster. Please contact us for a free, no obligation quote and c...
QA's Pointing Brick Repair
Relax... you have found a reliable extension builder in City Of Westminster. QA's Pointing and Brick Repair is a friendly and reliable company base...
Need to find an Extension Builder near you for all your extension buildering work?
BELLVIEW BUILDERS LTD provides a local, trusted extensio...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Experienced extension builder ready to quote for your work. Khetani Builders (UK) Ltd is the best extension builder in City Of Westminster. No obli...
SJ Expert Building Services are here to help customers who need an Extension Builder in City Of Westminster. We offer a competitive rate to complet...

Outbuilding costs in City Of Westminster range from the cheapest of £10,024 (SH Enterprise based in EC1V) to the dearest of £11,584 (Propello based in E17), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in City Of Westminster by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near London | £43 | £273 |
| Outbuilding near Camden Town | £44 | £277 |
| Outbuilding near Belgravia | £44 | £276 |
| Outbuilding near Chelsea | £44 | £276 |
| Outbuilding near Lambeth | £44 | £275 |
| Outbuilding near Kensington | £44 | £277 |
| Outbuilding near Islington | £45 | £276 |
| Outbuilding near Fulham | £44 | £278 |
| Outbuilding near Camberwell | £44 | £276 |
| Outbuilding near Bethnal Green | £45 | £276 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,826

Two storey extension - £88,488

Build a timber frame extension - £26,326

Build a swimming pool - £81,326

Single storey extension - £61,512

Side return extension - £45,163

Install an RSJ - £2,526

Outbuilding - £10,326

Build a Mansard loft conversion - £52,326

Loft conversion - £36,803

Build a kitchen extension - £42,326

Hip to gable loft conversion - £42,326

Granny annexe - £87,326

Garden office - £10,326

Convert a Garage - £16,326

Garage - £18,826

Build a flat roof extension - £22,326

Build a dormer loft conversion - £42,326

Concrete foundations - £6,576

Convert a bungalow loft - £29,326

Convert a basement - £41,163