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Select your affordable WC1A extension builder
JK Doors is a trusted extension builder serving customers in WC1A and the surrounding area. Contact us to today to get a competitive quote for exte...
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
CK Constructions & Development Ltd is a trusted extension builder serving customers in WC1A and the surrounding area. Contact us to today to get a ...
A to Z Builders Ltd are here to help customers who need an Extension Builder in WC1A. We offer a competitive rate to complete all your extension bu...
JM Building Services is a trusted extension builder serving customers in WC1A and the surrounding area. Contact us to today to get a competitive qu...
Buildwiser is a trusted extension builder serving customers in WC1A and the surrounding area. Contact us to today to get a competitive quote for ex...
F & F Building Services is an established extension buildering business in WC1A. We come highly recommended and provide competitive quotes for your...
From £12,064
Anthony Sullivan
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
From £10,152
Plansing Ltd
Experience the best architectural design services with PLANSING, where we flawlessly integrate innovative architectural designer products to bring ...
From £10,040
TOP CONSTRUCTION is an established extension buildering business in WC1A. We come highly recommended and provide competitive quotes for your work.<...

Outbuilding costs in WC1A range from the cheapest of £9,976 (A to Z Builders Ltd based in SW1P) to the dearest of £12,064 (Q Lofts and Extensions based in EC1R), 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 WC1A 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 - £17,830

Two storey extension - £88,494

Build a timber frame extension - £26,330

Build a swimming pool - £81,330

Single storey extension - £61,592

Side return extension - £45,208

Install an RSJ - £2,530

Outbuilding - £10,330

Build a Mansard loft conversion - £52,330

Loft conversion - £36,840

Build a kitchen extension - £42,330

Hip to gable loft conversion - £42,330

Granny annexe - £87,330

Garden office - £10,330

Convert a Garage - £16,330

Garage - £18,830

Build a flat roof extension - £22,330

Build a dormer loft conversion - £42,330

Concrete foundations - £6,580

Convert a bungalow loft - £29,330

Convert a basement - £41,208