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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...

In City Of Westminster, prices for dormer loft conversions range from £42,024 (SH Enterprise based in EC1V) to £43,584 (Propello based in E17), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.
The best way to get an accurate price is to compare quotes from extension builders in City Of Westminster. Post your job on HaMuch now and we'll put you in touch with available extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Dormer Loft Conversion near London | £43 | £273 |
| Build A Dormer Loft Conversion near Camden Town | £44 | £277 |
| Build A Dormer Loft Conversion near Belgravia | £44 | £276 |
| Build A Dormer Loft Conversion near Chelsea | £44 | £276 |
| Build A Dormer Loft Conversion near Lambeth | £44 | £275 |
| Build A Dormer Loft Conversion near Kensington | £44 | £277 |
| Build A Dormer Loft Conversion near Islington | £45 | £276 |
| Build A Dormer Loft Conversion near Fulham | £44 | £278 |
| Build A Dormer Loft Conversion near Camberwell | £44 | £276 |
| Build A Dormer Loft Conversion 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