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JK Doors is a trusted extension builder serving customers in Harley Street and the surrounding area. Contact us to today to get a competitive quote...
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 Harley Street and the surrounding area. Contact us to today to get a compe...
Relax... you have found a reliable extension builder in Harley Street. M & A UK Ltd is a friendly and reliable company based in Harley Street who c...
Darren Bergin
Relax... you have found a reliable extension builder in Harley Street. First guard Roofing is a friendly and reliable company based in Harley Stree...
CK Constructions & Development Ltd is a trusted extension builder serving customers in Harley Street and the surrounding area. Contact us to today ...
A to Z Builders Ltd are here to help customers who need an Extension Builder in Harley Street. We offer a competitive rate to complete all your ext...
JM Building Services is a trusted extension builder serving customers in Harley Street and the surrounding area. Contact us to today to get a compe...
Hussein Eljhani
We are highly professional Builders Company, hones pricing and reliable, we leave all areas clean and tidy.

Garage conversions in Harley Street typically range from £15,928 (BPS Building based in NW6) to £16,640 (ELJHANI BUILDING & PROPERTY MANAGEMENT SERVICES LTD based in NE4), but the only way to get an accurate cost for your specific project is to get quotes.
Post a job with HaMuch and we'll send it to extension builders in Harley Street who will be happy to help.
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