From £88,072
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in UB9. No obligation free quotes ...
1 review
From £88,288
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
From £88,588
Need an Extension Builder in UB9? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £88,420
Member since August 2026
Relax... you have found a reliable extension builder in UB9. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in UB9 who cons...
From £88,288
Need an Extension Builder in UB9? VA Structures has been helping local clients (10 mile radius) with their extension buildering jobs for many years...
From £88,420
Trusted and professional extension builder in UB9. Experienced in all extension buildering work and keeping within budget and on quote. DC Build & ...
From £88,468
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £88,648
DP Services is a fully insured friendly local company which has been trading since 2002 and delivers high quality building work in domestic extensi...
From £88,228
I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...
From £88,456
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...

Costs range from £88,072 (J&J Building Solutions based in SW16) to £88,648 (DP Services based in RG41), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
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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 - £17,758

Two storey extension - £88,388

Build a timber frame extension - £26,258

Build a swimming pool - £81,258

Single storey extension - £60,168

Side return extension - £44,407

Install an RSJ - £2,458

Outbuilding - £10,258

Build a Mansard loft conversion - £52,258

Loft conversion - £36,173

Build a kitchen extension - £42,258

Hip to gable loft conversion - £42,258

Granny annexe - £87,258

Garden office - £10,258

Convert a Garage - £16,258

Garage - £18,758

Build a flat roof extension - £22,258

Build a dormer loft conversion - £42,258

Concrete foundations - £6,508

Convert a bungalow loft - £29,258

Convert a basement - £40,407