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JK Doors is a trusted extension builder serving customers in WC1X 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
Darren Bergin
Relax... you have found a reliable extension builder in WC1X. First guard Roofing is a friendly and reliable company based in WC1X who consider no ...
CK Constructions & Development Ltd is a trusted extension builder serving customers in WC1X and the surrounding area. Contact us to today to get a ...
JM Building Services is a trusted extension builder serving customers in WC1X and the surrounding area. Contact us to today to get a competitive qu...
Buildwiser is a trusted extension builder serving customers in WC1X and the surrounding area. Contact us to today to get a competitive quote for ex...
From £64,720
Anthony Sullivan
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
From £43,210
Plansing Ltd
Experience the best architectural design services with PLANSING, where we flawlessly integrate innovative architectural designer products to bring ...
From £41,950
TOP CONSTRUCTION is an established extension buildering business in WC1X. We come highly recommended and provide competitive quotes for your work.<...
From £41,500
Need an Extension Builder in WC1X? Bok Services Ltd has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...

Comparing extension builders estimates for Side return extension 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 a side return extention by posting your job to extension builders in WC1X.
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 - £17,825

Two storey extension - £88,487

Build a timber frame extension - £26,325

Build a swimming pool - £81,325

Single storey extension - £61,496

Side return extension - £45,154

Install an RSJ - £2,525

Outbuilding - £10,325

Build a Mansard loft conversion - £52,325

Loft conversion - £36,795

Build a kitchen extension - £42,325

Hip to gable loft conversion - £42,325

Granny annexe - £87,325

Garden office - £10,325

Convert a Garage - £16,325

Garage - £18,825

Build a flat roof extension - £22,325

Build a dormer loft conversion - £42,325

Concrete foundations - £6,575

Convert a bungalow loft - £29,325

Convert a basement - £41,154