Radoslaw Rzanek
Trusted and professional extension builder in SE3. Experienced in all extension buildering work and keeping within budget and on quote. RR'S Builde...
Trusted and professional extension builder in SE3. Experienced in all extension buildering work and keeping within budget and on quote. AM Builder ...
Jay Christenson
Experienced extension builder ready to quote for your work. Jmc buildets is the best extension builder in SE3. No obligation free quotes and many h...
RLD Contractors Ltd is an established and experienced local extension builder in SE3. Please contact us for a free, no obligation quote and competi...
Rapid Bee Ltd is an established extension buildering business in SE3. We come highly recommended and provide competitive quotes for your work.
...Andy Hart
Need to find an Extension Builder near you for all your extension buildering work?
Hartigans Construction provides a local, trusted extensi...
Relax... you have found a reliable extension builder in SE3. S G Painting Contractor Ltd is a friendly and reliable company based in SE3 who consid...
Need to find an Extension Builder near you for all your extension buildering work?
JEM BUILDING CONTRACTORS LTD provides a local, trusted e...
From £17,420
Trusted and professional extension builder in SE3. Experienced in all extension buildering work and keeping within budget and on quote. Trafalgar B...
From £17,724
TA LEE BUILDING SERVICES is an established extension buildering business in SE3. We come highly recommended and provide competitive quotes for your...

Underpinning ranges from £17,116 (Jmc buildets based in SE9) to £17,764 (RR'S Builders based in SE12), 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 SE3 by posting a job with HaMuch and we will send it to extension builders in SE3.
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 - £17,537

Two storey extension - £88,055

Build a timber frame extension - £26,037

Build a swimming pool - £81,037

Single storey extension - £55,736

Side return extension - £41,914

Install an RSJ - £2,237

Outbuilding - £10,037

Build a Mansard loft conversion - £52,037

Loft conversion - £34,095

Build a kitchen extension - £42,037

Hip to gable loft conversion - £42,037

Granny annexe - £87,037

Garden office - £10,037

Convert a Garage - £16,037

Garage - £18,537

Build a flat roof extension - £22,037

Build a dormer loft conversion - £42,037

Concrete foundations - £6,287

Convert a bungalow loft - £29,037

Convert a basement - £37,914