Khalid Osman
We agree on the work, price and appointment before starting. Our approach focuses on clear communication, punctuality, careful workmanship and leav...
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...
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Finsbury and the surrounding area. Contact us to today to get a competitiv...
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
Jay Reid
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...

Outbuilding costs in Finsbury range from the cheapest of £9,976 (SLS BUILDERS LIMITED based in NW5) to the dearest of £12,320 (Reid and Co Developments Ltd based in NW8), 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 Finsbury by posting a job with HaMuch and we will send it to 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 - £17,850

Two storey extension - £88,524

Build a timber frame extension - £26,350

Build a swimming pool - £81,350

Single storey extension - £61,992

Side return extension - £45,433

Install an RSJ - £2,550

Outbuilding - £10,350

Build a Mansard loft conversion - £52,350

Loft conversion - £37,028

Build a kitchen extension - £42,350

Hip to gable loft conversion - £42,350

Granny annexe - £87,350

Garden office - £10,350

Convert a Garage - £16,350

Garage - £18,850

Build a flat roof extension - £22,350

Build a dormer loft conversion - £42,350

Concrete foundations - £6,600

Convert a bungalow loft - £29,350

Convert a basement - £41,433