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Select your affordable EC1A 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
CK Constructions & Development Ltd is a trusted extension builder serving customers in EC1A and the surrounding area. Contact us to today to get a ...
JK Doors is a trusted extension builder serving customers in EC1A and the surrounding area. Contact us to today to get a competitive quote for exte...
GS Fabric Ltd is an established and experienced local extension builder in EC1A. Please contact us for a free, no obligation quote and competitive ...
JM Building Services is a trusted extension builder serving customers in EC1A and the surrounding area. Contact us to today to get a competitive qu...
Buildwiser is a trusted extension builder serving customers in EC1A and the surrounding area. Contact us to today to get a competitive quote for ex...
Anthony Sullivan
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
From £39,210
Plansing Ltd
Experience the best architectural design services with PLANSING, where we flawlessly integrate innovative architectural designer products to bring ...
From £37,950
TOP CONSTRUCTION is an established extension buildering business in EC1A. We come highly recommended and provide competitive quotes for your work.<...

Comparing extension builders estimates for a Convert a basement gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost to convert a basement in EC1A by posting a job with HaMuch and we will send it to extension builders in EC1A.
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 - £17,802

Two storey extension - £88,452

Build a timber frame extension - £26,302

Build a swimming pool - £81,302

Single storey extension - £61,032

Side return extension - £44,893

Install an RSJ - £2,502

Outbuilding - £10,302

Build a Mansard loft conversion - £52,302

Loft conversion - £36,578

Build a kitchen extension - £42,302

Hip to gable loft conversion - £42,302

Granny annexe - £87,302

Garden office - £10,302

Convert a Garage - £16,302

Garage - £18,802

Build a flat roof extension - £22,302

Build a dormer loft conversion - £42,302

Concrete foundations - £6,552

Convert a bungalow loft - £29,302

Convert a basement - £40,893