From £16,868
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 £16,884
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 £16,796
Ballantine building solutions is an established extension buildering business in Sydenham. We come highly recommended and provide competitive quote...
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 £16,636
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
From £16,876
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
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 £16,884
Relax... you have found a reliable extension builder in Sydenham. Finch Construction NI is a friendly and reliable company based in Sydenham who co...

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 - £16,821

Two storey extension - £86,981

Build a timber frame extension - £25,321

Build a swimming pool - £80,321

Single storey extension - £41,416

Side return extension - £33,859

Install an RSJ - £1,521

Outbuilding - £9,321

Build a Mansard loft conversion - £51,321

Loft conversion - £27,383

Build a kitchen extension - £41,321

Hip to gable loft conversion - £41,321

Granny annexe - £86,321

Garden office - £9,321

Convert a Garage - £15,321

Garage - £17,821

Build a flat roof extension - £21,321

Build a dormer loft conversion - £41,321

Concrete foundations - £5,571

Convert a bungalow loft - £28,321

Convert a basement - £29,859