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Fitzrovia, W1W
JK Doors is a trusted extension builder serving customers in Fitzrovia and the surrounding area. Contact us to today to get a competitive quote for...
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
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Fitzrovia and the surrounding area. Contact us to today to get a competiti...
Relax... you have found a reliable extension builder in Fitzrovia. M & A UK Ltd is a friendly and reliable company based in Fitzrovia who consider ...
Darren Bergin
Relax... you have found a reliable extension builder in Fitzrovia. First guard Roofing is a friendly and reliable company based in Fitzrovia who co...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Fitzrovia and the surrounding area. Contact us to today to g...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Fitzrovia. We offer a competitive rate to complete all your extensi...
JM Building Services is a trusted extension builder serving customers in Fitzrovia and the surrounding area. Contact us to today to get a competiti...
Hussein Eljhani
We are highly professional Builders Company, hones pricing and reliable, we leave all areas clean and tidy.

A flat roof extension ranges from the cheapest of £21,928 (BPS Building based in NW6) to the dearest of £22,640 (ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD based in NE4), 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 Fitzrovia by posting a job with HaMuch. We'll send it to extension builders in Fitzrovia.
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 - £17,666

Two storey extension - £88,248

Build a timber frame extension - £26,166

Build a swimming pool - £81,166

Single storey extension - £58,312

Side return extension - £43,363

Install an RSJ - £2,366

Outbuilding - £10,166

Build a Mansard loft conversion - £52,166

Loft conversion - £35,303

Build a kitchen extension - £42,166

Hip to gable loft conversion - £42,166

Granny annexe - £87,166

Garden office - £10,166

Convert a Garage - £16,166

Garage - £18,666

Build a flat roof extension - £22,166

Build a dormer loft conversion - £42,166

Concrete foundations - £6,416

Convert a bungalow loft - £29,166

Convert a basement - £39,363