From £9,512
N W Doyle & Son is a trusted extension builder serving customers in BT23 and the surrounding area. Contact us to today to get a competitive quote f...
From £9,400
T.I Building is a trusted extension builder serving customers in BT23 and the surrounding area. Contact us to today to get a competitive quote for ...
From £9,136
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
From £9,368
Relax... you have found a reliable extension builder in BT23. SM Plumbing & Heating is a friendly and reliable company based in BT23 who consider n...
From £9,336
Trusted and professional extension builder in BT23. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £9,296
Ballantine building solutions is an established extension buildering business in BT23. We come highly recommended and provide competitive quotes fo...
From £9,272
apex pharaoh ltd is a trusted extension builder serving customers in BT23 and the surrounding area. Contact us to today to get a competitive quote ...
From £9,176
Trusted and professional extension builder in BT23. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...
From £9,384
Designco Ltd is an established extension buildering business in BT23. We come highly recommended and provide competitive quotes for your work.
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Outbuilding costs in BT23 range from the cheapest of £9,136 (Mount Oriel Conversions & Extensions based in BT8) to the dearest of £9,512 (N W Doyle & Son based in BT24), 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 BT23 by posting a job with HaMuch and we will send it to extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Outbuilding near Ballygowan | £24 | £183 |
| Outbuilding near Comber | £22 | £160 |
| Outbuilding near Bangor | £24 | £183 |
| Outbuilding near Bangor | £24 | £183 |
| Outbuilding near Holywood | £23 | £159 |
| Outbuilding near Carryduff | £23 | £158 |
| Outbuilding near Saintfield | £23 | £162 |
| Outbuilding near Belfast | £23 | £161 |
| Outbuilding near Greenisland | £23 | £153 |
| Outbuilding near Ballynahinch | £19 | £189 |
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 - £16,837

Two storey extension - £87,005

Build a timber frame extension - £25,337

Build a swimming pool - £80,337

Single storey extension - £41,736

Side return extension - £34,039

Install an RSJ - £1,537

Outbuilding - £9,337

Build a Mansard loft conversion - £51,337

Loft conversion - £27,533

Build a kitchen extension - £41,337

Hip to gable loft conversion - £41,337

Granny annexe - £86,337

Garden office - £9,337

Convert a Garage - £15,337

Garage - £17,837

Build a flat roof extension - £21,337

Build a dormer loft conversion - £41,337

Concrete foundations - £5,587

Convert a bungalow loft - £28,337

Convert a basement - £30,039