From £16,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Fleet Street. No obligation fre...
From £16,560
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
From £16,096
Experienced extension builder ready to quote for your work. Mr is the best extension builder in Fleet Street. No obligation free quotes and many ha...
From £15,984
JK Doors is a trusted extension builder serving customers in Fleet Street and the surrounding area. Contact us to today to get a competitive quote ...
From £16,192
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £16,392
Need an Extension Builder in Fleet Street? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for...
From £16,312
skilled worker who specializes in completing a wide range of building and renovation projects
From £16,616
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in Fleet Street and the surrounding area. Contact us to today to g...
From £15,888
Member since April 2025
Trusted and professional extension builder in Fleet Street. Experienced in all extension buildering work and keeping within budget and on quote. GR...
From £16,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Garage conversions in Fleet Street typically range from £15,888 (GR MAINTENANCE LTD based in IG11) to £16,616 (HOUSE BUILDING SERVICES LIMITED based in DA16), 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 Fleet 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 - £17,740

Two storey extension - £88,360

Build a timber frame extension - £26,240

Build a swimming pool - £81,240

Single storey extension - £59,800

Side return extension - £44,200

Install an RSJ - £2,440

Outbuilding - £10,240

Build a Mansard loft conversion - £52,240

Loft conversion - £36,000

Build a kitchen extension - £42,240

Hip to gable loft conversion - £42,240

Granny annexe - £87,240

Garden office - £10,240

Convert a Garage - £16,240

Garage - £18,740

Build a flat roof extension - £22,240

Build a dormer loft conversion - £42,240

Concrete foundations - £6,490

Convert a bungalow loft - £29,240

Convert a basement - £40,200