From £17,932
Island design & Construction Ltd are here to help customers who need an Extension Builder in Deptford. We offer a competitive rate to complete all ...
From £17,404
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,620
CG Design & Build is a boutique architectural design agency with in-house construction teams, delivering unique one-off residential and commercial...
From £17,516
WiseContract are here to help customers who need an Extension Builder in Deptford. We offer a competitive rate to complete all your extension build...
From £17,948
We pride ourselves on providing a professional, caring, and high-quality service and always meet our customers’ needs. Each contractor that works...
From £17,876
Need an Extension Builder in Deptford? Exquisite Design & Build Ltd has been helping local clients (5 mile radius) with their extension buildering ...
From £17,548
Experienced extension builder ready to quote for your work. AZC BUILDING SERVICES is the best extension builder in Deptford. No obligation free quo...
From £17,812
Need to find an Extension Builder near you for all your extension buildering work?
blitbolt ltd provides a local, trusted extension builder...
From £17,700
We have a creative eye and like a challenge, often building bespoke and creative buildings and furniture. This is mixed with a wide experience of m...
From £17,844
MARMAREX is a trusted extension builder serving customers in Deptford and the surrounding area. Contact us to today to get a competitive quote for ...

Underpinning ranges from £17,404 (CG Design and Build LTD. based in e14) to £17,948 (DWL Construction Ltd based in SE14), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in Deptford by posting a job with HaMuch and we will send it to extension builders in Deptford.
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 - £17,720

Two storey extension - £88,330

Build a timber frame extension - £26,220

Build a swimming pool - £81,220

Single storey extension - £59,400

Side return extension - £43,975

Install an RSJ - £2,420

Outbuilding - £10,220

Build a Mansard loft conversion - £52,220

Loft conversion - £35,813

Build a kitchen extension - £42,220

Hip to gable loft conversion - £42,220

Granny annexe - £87,220

Garden office - £10,220

Convert a Garage - £16,220

Garage - £18,720

Build a flat roof extension - £22,220

Build a dormer loft conversion - £42,220

Concrete foundations - £6,470

Convert a bungalow loft - £29,220

Convert a basement - £39,975