From £17,660
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,540
Lewisham Greater London, SE13
Dule Vida Property Design Ltd is a trusted extension builder serving customers in Lewisham and the surrounding area. Contact us to today to get a c...
From £17,772
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,740
Greater London, SE13
TP Building & Development Services Ltd is an established and experienced local extension builder in Lewisham. Please contact us for a free, no obli...
From £17,716
Our building services company Demiri Builder Ltd has 15 years’ experience in the industry. We have been helping customers in Lewisham and the sur...
From £17,764
Trusted and professional extension builder in Lewisham. Experienced in all extension buildering work and keeping within budget and on quote. RR'S B...
From £17,812
Construction Surety is an established extension buildering business in Lewisham. We come highly recommended and provide competitive quotes for your...
From £17,548
Experienced extension builder ready to quote for your work. AZC BUILDING SERVICES is the best extension builder in Lewisham. No obligation free quo...
From £17,772
Based in south east London and with over 30 years of experience in the construction sector, we offer a range of services including interior and ext...
From £17,652
Relax... you have found a reliable extension builder in Lewisham. S G Painting Contractor Ltd is a friendly and reliable company based in Lewisham ...

Underpinning ranges from £17,540 (Dule Vida Property Design Ltd based in SE13) to £17,812 (Construction Surety based in SE13), 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 Lewisham by posting a job with HaMuch and we will send it to extension builders in Lewisham.
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 - £17,698

Two storey extension - £88,296

Build a timber frame extension - £26,198

Build a swimming pool - £81,198

Single storey extension - £58,952

Side return extension - £43,723

Install an RSJ - £2,398

Outbuilding - £10,198

Build a Mansard loft conversion - £52,198

Loft conversion - £35,603

Build a kitchen extension - £42,198

Hip to gable loft conversion - £42,198

Granny annexe - £87,198

Garden office - £10,198

Convert a Garage - £16,198

Garage - £18,698

Build a flat roof extension - £22,198

Build a dormer loft conversion - £42,198

Concrete foundations - £6,448

Convert a bungalow loft - £29,198

Convert a basement - £39,723