Relax... you have found a reliable extension builder in BT12. SM Plumbing & Heating is a friendly and reliable company based in BT12 who consider n...
From £41,336
Trusted and professional extension builder in BT12. Experienced in all extension buildering work and keeping within budget and on quote. Belfast Lo...
From £41,176
Trusted and professional extension builder in BT12. Experienced in all extension buildering work and keeping within budget and on quote. Extended l...

In BT12, prices for dormer loft conversions range from £41,176 (Extended living by Gilbert-Ash based in BT12) to £41,368 (SM Plumbing & Heating based in BT7), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.
The best way to get an accurate price is to compare quotes from extension builders in BT12. Post your job on HaMuch now and we'll put you in touch with available extension builders.
"Build a dormer loft conversion" - BT11, job posted 09/02/26
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Dormer Loft Conversion near Belfast | £23 | £161 |
| Build A Dormer Loft Conversion near Carryduff | £23 | £158 |
| Build A Dormer Loft Conversion near Holywood | £23 | £159 |
| Build A Dormer Loft Conversion near Lisburn | £24 | £164 |
| Build A Dormer Loft Conversion near Greenisland | £23 | £153 |
| Build A Dormer Loft Conversion near Comber | £22 | £160 |
| Build A Dormer Loft Conversion near Hillsborough and Culcavy | £25 | £170 |
| Build A Dormer Loft Conversion near Crumlin | £26 | £194 |
| Build A Dormer Loft Conversion near Ballygowan | £24 | £183 |
| Build A Dormer Loft Conversion near Saintfield | £23 | £162 |
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 - £16,793

Two storey extension - £86,940

Build a timber frame extension - £25,293

Build a swimming pool - £80,293

Single storey extension - £40,867

Side return extension - £33,550

Install an RSJ - £1,493

Outbuilding - £9,293

Build a Mansard loft conversion - £51,293

Loft conversion - £27,125

Build a kitchen extension - £41,293

Hip to gable loft conversion - £41,293

Granny annexe - £86,293

Garden office - £9,293

Convert a Garage - £15,293

Garage - £17,793

Build a flat roof extension - £21,293

Build a dormer loft conversion - £41,293

Concrete foundations - £5,543

Convert a bungalow loft - £28,293

Convert a basement - £29,550