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P R Building is a trusted extension builder serving customers in Islington and the surrounding area. Contact us to today to get a competitive quote...
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...
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Islington and the surrounding area. Contact us to today to get a competiti...
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
Experienced extension builder ready to quote for your work. Five Star Builder is the best extension builder in Islington. No obligation free quotes...
Relax... you have found a reliable extension builder in Islington. London Trowel Co. is a friendly and reliable company based in Islington who cons...
Trusted and professional extension builder in Islington. Experienced in all extension buildering work and keeping within budget and on quote. Therm...
Darren Bergin
Relax... you have found a reliable extension builder in Islington. First guard Roofing is a friendly and reliable company based in Islington who co...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Islington and the surrounding area. Contact us to today to g...

Garden offices range from the cheapest of £9,976 (SLS BUILDERS LIMITED based in NW5) to the dearest of £10,400 (Five Star Builder based in N16), but these are only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in Islington by posting a job with HaMuch. We'll send it to extension builders in Islington.
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 - £17,706

Two storey extension - £88,308

Build a timber frame extension - £26,206

Build a swimming pool - £81,206

Single storey extension - £59,112

Side return extension - £43,813

Install an RSJ - £2,406

Outbuilding - £10,206

Build a Mansard loft conversion - £52,206

Loft conversion - £35,678

Build a kitchen extension - £42,206

Hip to gable loft conversion - £42,206

Granny annexe - £87,206

Garden office - £10,206

Convert a Garage - £16,206

Garage - £18,706

Build a flat roof extension - £22,206

Build a dormer loft conversion - £42,206

Concrete foundations - £6,456

Convert a bungalow loft - £29,206

Convert a basement - £39,813