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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 Mansion House. London Trowel Co. is a friendly and reliable company based in Mansion House ...
Trusted and professional extension builder in Mansion House. Experienced in all extension buildering work and keeping within budget and on quote. T...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Mansion House and the surrounding area. Contact us to today ...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Mansion House. We offer a competitive rate to complete all your ext...
Experienced extension builder ready to quote for your work. Cornerstones Construction is the best extension builder in Mansion House. No obligation...
JK Doors is a trusted extension builder serving customers in Mansion House and the surrounding area. Contact us to today to get a competitive quote...
GS Fabric Ltd is an established and experienced local extension builder in Mansion House. Please contact us for a free, no obligation quote and com...
JM Building Services is a trusted extension builder serving customers in Mansion House and the surrounding area. Contact us to today to get a compe...

A flat roof extension ranges from the cheapest of £21,928 (GS Fabric Ltd based in E2) to the dearest of £22,376 (CK Constructions & Development Ltd based in WC1N), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Mansion House by posting a job with HaMuch. We'll send it to extension builders in Mansion House.
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 - £17,617

Two storey extension - £88,175

Build a timber frame extension - £26,117

Build a swimming pool - £81,117

Single storey extension - £57,336

Side return extension - £42,814

Install an RSJ - £2,317

Outbuilding - £10,117

Build a Mansard loft conversion - £52,117

Loft conversion - £34,845

Build a kitchen extension - £42,117

Hip to gable loft conversion - £42,117

Granny annexe - £87,117

Garden office - £10,117

Convert a Garage - £16,117

Garage - £18,617

Build a flat roof extension - £22,117

Build a dormer loft conversion - £42,117

Concrete foundations - £6,367

Convert a bungalow loft - £29,117

Convert a basement - £38,814