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Select your affordable N1 extension builder
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
Relax... you have found a reliable extension builder in N1. London Trowel Co. is a friendly and reliable company based in N1 who consider no job as...
Trusted and professional extension builder in N1. Experienced in all extension buildering work and keeping within budget and on quote. Thermodynami...
Darren Bergin
Relax... you have found a reliable extension builder in N1. First guard Roofing is a friendly and reliable company based in N1 who consider no job ...
CK Constructions & Development Ltd is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a co...
GS Fabric Ltd is an established and experienced local extension builder in N1. Please contact us for a free, no obligation quote and competitive ra...
JM Building Services is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a competitive quot...
Andreas Thomas Demetri is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a competitive qu...
Buildwiser is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a competitive quote for exte...

Garden offices range from the cheapest of £9,928 (GS Fabric Ltd based in E2) to the dearest of £10,376 (CK Constructions & Development Ltd based in WC1N), 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 N1 by posting a job with HaMuch. We'll send it to extension builders in N1.
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 - £17,634

Two storey extension - £88,202

Build a timber frame extension - £26,134

Build a swimming pool - £81,134

Single storey extension - £57,688

Side return extension - £43,012

Install an RSJ - £2,334

Outbuilding - £10,134

Build a Mansard loft conversion - £52,134

Loft conversion - £35,010

Build a kitchen extension - £42,134

Hip to gable loft conversion - £42,134

Granny annexe - £87,134

Garden office - £10,134

Convert a Garage - £16,134

Garage - £18,634

Build a flat roof extension - £22,134

Build a dormer loft conversion - £42,134

Concrete foundations - £6,384

Convert a bungalow loft - £29,134

Convert a basement - £39,012