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JK Doors is a trusted extension builder serving customers in Finsbury and the surrounding area. Contact us to today to get a competitive quote for ...
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
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Finsbury and the surrounding area. Contact us to today to get a competitiv...
Relax... you have found a reliable extension builder in Finsbury. London Trowel Co. is a friendly and reliable company based in Finsbury who consid...
Trusted and professional extension builder in Finsbury. Experienced in all extension buildering work and keeping within budget and on quote. Thermo...
Darren Bergin
Relax... you have found a reliable extension builder in Finsbury. First guard Roofing is a friendly and reliable company based in Finsbury who cons...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Finsbury and the surrounding area. Contact us to today to ge...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Finsbury. We offer a competitive rate to complete all your extensio...
GS Fabric Ltd is an established and experienced local extension builder in Finsbury. Please contact us for a free, no obligation quote and competit...
JM Building Services is a trusted extension builder serving customers in Finsbury and the surrounding area. Contact us to today to get a competitiv...

Comparing extension builders estimates for a Convert a basement gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost to convert a basement in Finsbury by posting a job with HaMuch and we will send it to extension builders in Finsbury.
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 - £17,606

Two storey extension - £88,158

Build a timber frame extension - £26,106

Build a swimming pool - £81,106

Single storey extension - £57,112

Side return extension - £42,688

Install an RSJ - £2,306

Outbuilding - £10,106

Build a Mansard loft conversion - £52,106

Loft conversion - £34,740

Build a kitchen extension - £42,106

Hip to gable loft conversion - £42,106

Granny annexe - £87,106

Garden office - £10,106

Convert a Garage - £16,106

Garage - £18,606

Build a flat roof extension - £22,106

Build a dormer loft conversion - £42,106

Concrete foundations - £6,356

Convert a bungalow loft - £29,106

Convert a basement - £38,688