From £16,764
Trusted and professional extension builder in Carrickfergus. Experienced in all extension buildering work and keeping within budget and on quote. D...
From £16,796
Ballantine building solutions is an established extension buildering business in Carrickfergus. We come highly recommended and provide competitive ...
From £16,884
Designco Ltd is an established extension buildering business in Carrickfergus. We come highly recommended and provide competitive quotes for your w...
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 £16,476
Have worked in building industry for over 30 years contracts from government to private sector.
From £16,868
Relax... you have found a reliable extension builder in Carrickfergus. SM Plumbing & Heating is a friendly and reliable company based in Carrickfer...
From £16,676
Trusted and professional extension builder in Carrickfergus. Experienced in all extension buildering work and keeping within budget and on quote. E...
From £16,836
Trusted and professional extension builder in Carrickfergus. Experienced in all extension buildering work and keeping within budget and on quote. B...
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...

Underpinning ranges from £16,476 (Anak based in BT40) 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 Carrickfergus by posting a job with HaMuch and we will send it to extension builders in Carrickfergus.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Carrickfergus | £23 | £158 |
| Underpin A Building near Greenisland | £23 | £153 |
| Underpin A Building near Holywood | £23 | £159 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Bangor | £24 | £183 |
| Underpin A Building near Larne | £15 | £122 |
| Underpin A Building near Ballyclare | £20 | £124 |
| Underpin A Building near Belfast | £23 | £161 |
| Underpin A Building near Ballygowan | £24 | £183 |
| Underpin A Building near Comber | £22 | £160 |
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 - £16,780

Two storey extension - £86,920

Build a timber frame extension - £25,280

Build a swimming pool - £80,280

Single storey extension - £40,600

Side return extension - £33,400

Install an RSJ - £1,480

Outbuilding - £9,280

Build a Mansard loft conversion - £51,280

Loft conversion - £27,000

Build a kitchen extension - £41,280

Hip to gable loft conversion - £41,280

Granny annexe - £86,280

Garden office - £9,280

Convert a Garage - £15,280

Garage - £17,780

Build a flat roof extension - £21,280

Build a dormer loft conversion - £41,280

Concrete foundations - £5,530

Convert a bungalow loft - £28,280

Convert a basement - £29,400