Sort by rates or availability
Mount Oriel Conversions & Extensions
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
"Build a swimming pool" - BT4, job posted 21/09/26
SM Plumbing & Heating
Relax... you have found a reliable extension builder in Cregagh. SM Plumbing & Heating is a friendly and reliable company based in Cregagh who cons...
"Underpin a building" - BT11, job posted 14/09/26
£24/hr
£167/day
Belfast Loft Company
Trusted and professional extension builder in Cregagh. Experienced in all extension buildering work and keeping within budget and on quote. Belfast...
"Single storey extension" - BT11, job posted 13/09/26
£24/hr
£162/day
Ballantine building solutions
Ballantine building solutions is an established extension buildering business in Cregagh. We come highly recommended and provide competitive quotes...
"Build a dormer loft conversion" - BT11, job posted 02/09/26
"Single storey extension" - BT14, job posted 28/08/26
£21/hr
£147/day
Glenn M Floyd Building & Joinery Contracts
Glenn M Floyd Building & Joinery Contracts is an established and experienced local extension builder in Cregagh. Please contact us for a free, no o...
"Single storey extension" - BT11, job posted 03/08/26
£21/hr
£147/day
Extended living by Gilbert-Ash
Trusted and professional extension builder in Cregagh. Experienced in all extension buildering work and keeping within budget and on quote. Extende...
"Loft conversion" - BELFAST, job posted 28/06/26
£25/hr
£173/day
Designco Ltd
Designco Ltd is an established extension buildering business in Cregagh. We come highly recommended and provide competitive quotes for your work.
"New bathroom" - BT12, job posted 25/04/26
£25/hr
£172/day
LM Design & Build
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
"Loft conversion" - BT8, job posted 24/04/26
£26/hr
£173/day
Finch Construction NI
Relax... you have found a reliable extension builder in Cregagh. Finch Construction NI is a friendly and reliable company based in Cregagh who cons...
"RSJ installation" - BELFAST, job posted 23/02/26
£23/hr
£158/day
DGA
Trusted and professional extension builder in Cregagh. Experienced in all extension buildering work and keeping within budget and on quote. DGA hav...
"Single storey extension" - BELFAST, job posted 21/02/26
The most important thing is do avoid handing over cash or paying large sums in advance. Be wary of paying cash for a cheaper job, i.e. to avoid VAT, you may be going down a slippery slope of not doing things properly which may eventually mean your job is also not done properly.
Agree when you intend to pay, ideally after you are satisfied with the completed job. If it is a big job agree a schedule of staged payments which is fair to both parties.
To avoid bad tradespeople and to ensure you can find them should they not answer a mobile;
- Get proper contact details and check them yourself
- Check if the company is verified on the Companies House website
- Get phone details, ideally a land line or 0800 number and check it
- Get a physical office address
Get quotes in writing by email or in person if possible. Getting quotes online or by text is ok (make sure you accept the offer by replying). For large projects make a written agreement, schedule of works and snagging plans as part of a working document. Also;
- Agree expected quality of workmanship and materials in advance
- When will work start and when will project be finished, what happens if project over runs ?
- How long is the guarantee on work and materials eg 12 months
- Discuss onsite behaviour in advance (no smoking, swearing or using mobile phones for non-work purposes)
- Agree that your Extension Builder will remove all debris and rubbish and what level of tidying up you want after job
Compare Cregagh extension builders rates
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Extension Builders near Belfast | £23 | £161 |
| Extension Builders near Carryduff | £23 | £158 |
| Extension Builders near Holywood | £23 | £159 |
| Extension Builders near Comber | £22 | £160 |
| Extension Builders near Ballygowan | £24 | £183 |
| Extension Builders near Lisburn | £24 | £164 |
| Extension Builders near Greenisland | £23 | £153 |
| Extension Builders near Saintfield | £23 | £162 |
| Extension Builders near Hillsborough and Culcavy | £25 | £170 |
| Extension Builders near Bangor | £24 | £183 |
Job estimates from extension builders near you
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.
Build a timber frame extension - £25,304
Garden office - £9,304
Granny annexe - £86,304
Build a flat roof extension - £21,304
Convert a Garage - £15,304
Hip to gable loft conversion - £41,304
Convert a bungalow loft - £28,304
Build a dormer loft conversion - £41,304
Build a swimming pool - £80,304
Build a Mansard loft conversion - £51,304
Concrete foundations - £5,554
Underpin a building - £16,804
Two storey extension - £86,956
Convert a basement - £29,670
Side return extension - £33,670
Loft conversion - £27,225
Garage - £17,804
Single storey extension - £41,080
Outbuilding - £9,304
Install an RSJ - £1,504
Build a kitchen extension - £41,304
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