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Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
Torrington Design
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
Trusted and professional extension builder in Blackfriars. Experienced in all extension buildering work and keeping within budget and on quote. The...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Blackfriars and the surrounding area. Contact us to today to...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Blackfriars. We offer a competitive rate to complete all your exten...
Experienced extension builder ready to quote for your work. Cornerstones Construction is the best extension builder in Blackfriars. No obligation f...
JK Doors is a trusted extension builder serving customers in Blackfriars and the surrounding area. Contact us to today to get a competitive quote f...
GS Fabric Ltd is an established and experienced local extension builder in Blackfriars. Please contact us for a free, no obligation quote and compe...
JM Building Services is a trusted extension builder serving customers in Blackfriars and the surrounding area. Contact us to today to get a competi...
DUWIX BUILDING MAINTENANCE are here to help customers who need an Extension Builder in Blackfriars. We offer a competitive rate to complete all you...

In Blackfriars, prices for dormer loft conversions range from £41,928 (GS Fabric Ltd based in E2) to £42,376 (CK Constructions & Development Ltd based in WC1N), 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 Blackfriars. Post your job on HaMuch now and we'll put you in touch with available extension builders.
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 - £17,623

Two storey extension - £88,185

Build a timber frame extension - £26,123

Build a swimming pool - £81,123

Single storey extension - £57,464

Side return extension - £42,886

Install an RSJ - £2,323

Outbuilding - £10,123

Build a Mansard loft conversion - £52,123

Loft conversion - £34,905

Build a kitchen extension - £42,123

Hip to gable loft conversion - £42,123

Granny annexe - £87,123

Garden office - £10,123

Convert a Garage - £16,123

Garage - £18,623

Build a flat roof extension - £22,123

Build a dormer loft conversion - £42,123

Concrete foundations - £6,373

Convert a bungalow loft - £29,123

Convert a basement - £38,886