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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...
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...
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...
Peter Cesma
Experienced builder in all aspects of building works. All work guaranteed. Quality finish, promt ,honest and reliable services. Public liabil...

Building a granny annexe ranges from £86,928 (GS Fabric Ltd based in E2) to £87,376 (CK Constructions & Development Ltd based in WC1N), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in Blackfriars by posting a job with HaMuch. We will send it to extension builders in Blackfriars who will be happy to help you.
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 - £17,630

Two storey extension - £88,196

Build a timber frame extension - £26,130

Build a swimming pool - £81,130

Single storey extension - £57,608

Side return extension - £42,967

Install an RSJ - £2,330

Outbuilding - £10,130

Build a Mansard loft conversion - £52,130

Loft conversion - £34,973

Build a kitchen extension - £42,130

Hip to gable loft conversion - £42,130

Granny annexe - £87,130

Garden office - £10,130

Convert a Garage - £16,130

Garage - £18,630

Build a flat roof extension - £22,130

Build a dormer loft conversion - £42,130

Concrete foundations - £6,380

Convert a bungalow loft - £29,130

Convert a basement - £38,967