From £87,048
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in UB9. No obligation free quotes ...
From £87,280
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...
1 review
From £87,192
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 £87,192
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 £87,280
Trusted and professional extension builder in UB9. Experienced in all extension buildering work and keeping within budget and on quote. DC Build & ...
From £87,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,432
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 £87,152
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 £87,304
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...
From £88,024
Buci builders ltd is a trusted extension builder serving customers in UB9 and the surrounding area. Contact us to today to get a competitive quote ...

Building a granny annexe ranges from £87,048 (J&J Building Solutions based in SW16) to £88,024 (Buci builders ltd based in SE27), 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 UB9 by posting a job with HaMuch. We will send it to extension builders in UB9 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 - £17,822

Two storey extension - £88,482

Build a timber frame extension - £26,322

Build a swimming pool - £81,322

Single storey extension - £61,432

Side return extension - £45,118

Install an RSJ - £2,522

Outbuilding - £10,322

Build a Mansard loft conversion - £52,322

Loft conversion - £36,765

Build a kitchen extension - £42,322

Hip to gable loft conversion - £42,322

Granny annexe - £87,322

Garden office - £10,322

Convert a Garage - £16,322

Garage - £18,822

Build a flat roof extension - £22,322

Build a dormer loft conversion - £42,322

Concrete foundations - £6,572

Convert a bungalow loft - £29,322

Convert a basement - £41,118