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Select your affordable Fitzrovia extension builder
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Fitzrovia and the surrounding area. Contact us to today to get a competiti...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
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
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 ...
Jay Reid
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...
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...

Building a granny annexe ranges from £86,928 (BPS Building based in NW6) to £89,320 (Reid and Co Developments Ltd based in NW8), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in Fitzrovia by posting a job with HaMuch. We will send it to extension builders in Fitzrovia who will be happy to help you.
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 - £17,832

Two storey extension - £88,498

Build a timber frame extension - £26,332

Build a swimming pool - £81,332

Single storey extension - £61,640

Side return extension - £45,235

Install an RSJ - £2,532

Outbuilding - £10,332

Build a Mansard loft conversion - £52,332

Loft conversion - £36,863

Build a kitchen extension - £42,332

Hip to gable loft conversion - £42,332

Granny annexe - £87,332

Garden office - £10,332

Convert a Garage - £16,332

Garage - £18,832

Build a flat roof extension - £22,332

Build a dormer loft conversion - £42,332

Concrete foundations - £6,582

Convert a bungalow loft - £29,332

Convert a basement - £41,235