From £9,352
Need to find an Extension Builder near you for all your extension buildering work?
Firenstack Solutions provides a local, trusted extension...
From £9,208
Need an Extension Builder in Sydenham? MIRKOW has been helping local clients (20 mile radius) with their extension buildering jobs for many years. ...
From £9,368
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 £9,280
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £9,384
Designco Ltd is an established extension buildering business in Sydenham. We come highly recommended and provide competitive quotes for your work.<...
From £9,176
Trusted and professional extension builder in Sydenham. Experienced in all extension buildering work and keeping within budget and on quote. Extend...
From £9,296
Ballantine building solutions is an established extension buildering business in Sydenham. We come highly recommended and provide competitive quote...
From £9,336
Need an Extension Builder in Sydenham? H.M.Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many y...
From £9,264
Trusted and professional extension builder in Sydenham. Experienced in all extension buildering work and keeping within budget and on quote. DGA ha...

Outbuilding costs in Sydenham range from the cheapest of £9,176 (Extended living by Gilbert-Ash based in BT12) to the dearest of £9,488 (AK Building Services based in BT8), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in Sydenham by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Belfast | £23 | £161 |
| Outbuilding near Holywood | £23 | £159 |
| Outbuilding near Carryduff | £23 | £158 |
| Outbuilding near Comber | £22 | £160 |
| Outbuilding near Greenisland | £23 | £153 |
| Outbuilding near Ballygowan | £24 | £183 |
| Outbuilding near Bangor | £24 | £183 |
| Outbuilding near Bangor | £24 | £183 |
| Outbuilding near Carrickfergus | £23 | £158 |
| Outbuilding 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 - £16,815

Two storey extension - £86,973

Build a timber frame extension - £25,315

Build a swimming pool - £80,315

Single storey extension - £41,304

Side return extension - £33,796

Install an RSJ - £1,515

Outbuilding - £9,315

Build a Mansard loft conversion - £51,315

Loft conversion - £27,330

Build a kitchen extension - £41,315

Hip to gable loft conversion - £41,315

Granny annexe - £86,315

Garden office - £9,315

Convert a Garage - £15,315

Garage - £17,815

Build a flat roof extension - £21,315

Build a dormer loft conversion - £41,315

Concrete foundations - £5,565

Convert a bungalow loft - £28,315

Convert a basement - £29,796