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JK Doors is a trusted extension builder serving customers in WC1H 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
SLS BUILDERS LIMITED is a trusted extension builder serving customers in WC1H and the surrounding area. Contact us to today to get a competitive qu...
Darren Bergin
Relax... you have found a reliable extension builder in WC1H. First guard Roofing is a friendly and reliable company based in WC1H who consider no ...
CK Constructions & Development Ltd is a trusted extension builder serving customers in WC1H and the surrounding area. Contact us to today to get a ...
JM Building Services is a trusted extension builder serving customers in WC1H and the surrounding area. Contact us to today to get a competitive qu...
Hussein Eljhani
We are highly professional Builders Company, hones pricing and reliable, we leave all areas clean and tidy.
Buildwiser is a trusted extension builder serving customers in WC1H and the surrounding area. Contact us to today to get a competitive quote for ex...
From £60,720
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 ...

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 WC1H by posting a job with HaMuch and we will send it to extension builders in WC1H.
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 - £17,882

Two storey extension - £88,574

Build a timber frame extension - £26,382

Build a swimming pool - £81,382

Single storey extension - £62,648

Side return extension - £45,802

Install an RSJ - £2,582

Outbuilding - £10,382

Build a Mansard loft conversion - £52,382

Loft conversion - £37,335

Build a kitchen extension - £42,382

Hip to gable loft conversion - £42,382

Granny annexe - £87,382

Garden office - £10,382

Convert a Garage - £16,382

Garage - £18,882

Build a flat roof extension - £22,382

Build a dormer loft conversion - £42,382

Concrete foundations - £6,632

Convert a bungalow loft - £29,382

Convert a basement - £41,802