Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
Relax... you have found a reliable extension builder in Sydenham. SM Plumbing & Heating is a friendly and reliable company based in Sydenham who co...
From £16,836
Trusted and professional extension builder in Sydenham. Experienced in all extension buildering work and keeping within budget and on quote. Belfas...
From £16,796
Ballantine building solutions is an established extension buildering business in Sydenham. We come highly recommended and provide competitive quote...
From £16,884
Designco Ltd is an established extension buildering business in Sydenham. We come highly recommended and provide competitive quotes for your work.<...
From £16,676
Trusted and professional extension builder in Sydenham. Experienced in all extension buildering work and keeping within budget and on quote. Extend...
From £16,764
Trusted and professional extension builder in Sydenham. Experienced in all extension buildering work and keeping within budget and on quote. DGA ha...
From £16,876
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,636 (Mount Oriel Conversions & Extensions based in BT8) to £16,988 (AK Building Services based in BT8), 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 Sydenham by posting a job with HaMuch and we will send it to extension builders in Sydenham.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Holywood | £23 | £159 |
| Underpin A Building near Carryduff | £23 | £158 |
| Underpin A Building near Comber | £22 | £160 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Ballygowan | £24 | £183 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Carrickfergus | £23 | £158 |
| Underpin A Building near Lisburn | £24 | £164 |
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 - £16,814

Two storey extension - £86,971

Build a timber frame extension - £25,314

Build a swimming pool - £80,314

Single storey extension - £41,276

Side return extension - £33,780

Install an RSJ - £1,514

Outbuilding - £9,314

Build a Mansard loft conversion - £51,314

Loft conversion - £27,317

Build a kitchen extension - £41,314

Hip to gable loft conversion - £41,314

Granny annexe - £86,314

Garden office - £9,314

Convert a Garage - £15,314

Garage - £17,814

Build a flat roof extension - £21,314

Build a dormer loft conversion - £41,314

Concrete foundations - £5,564

Convert a bungalow loft - £28,314

Convert a basement - £29,780