T.I Building is a trusted extension builder serving customers in Lisburn and the surrounding area. Contact us to today to get a competitive quote f...
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
Relax... you have found a reliable extension builder in Lisburn. SM Plumbing & Heating is a friendly and reliable company based in Lisburn who cons...
From £51,336
Trusted and professional extension builder in Lisburn. Experienced in all extension buildering work and keeping within budget and on quote. Belfast...
From £51,384
Relax... you have found a reliable extension builder in Lisburn. Finch Construction NI is a friendly and reliable company based in Lisburn who cons...
From £51,176
Trusted and professional extension builder in Lisburn. Experienced in all extension buildering work and keeping within budget and on quote. Extende...

Mansard loft conversions range from the cheapest installation of £51,136 (Mount Oriel Conversions & Extensions based in BT8) to the dearest of around £51,488 (AK Building Services based in BT8).
While these estimates give you a good idea how much you'll pay for a mansard loft conversion, the only way to get an accurate price is to get real quotes from real builders.
Get quotes to install a mansard loft conversion in Lisburn by posting a job with HaMuch and we'll send it to extension builders in Lisburn.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Mansard Loft Conversion near Lisburn | £24 | £164 |
| Build A Mansard Loft Conversion near Hillsborough and Culcavy | £25 | £170 |
| Build A Mansard Loft Conversion near Maghaberry | £31 | £205 |
| Build A Mansard Loft Conversion near Carryduff | £23 | £158 |
| Build A Mansard Loft Conversion near Belfast | £23 | £161 |
| Build A Mansard Loft Conversion near Crumlin | £26 | £194 |
| Build A Mansard Loft Conversion near Saintfield | £23 | £162 |
| Build A Mansard Loft Conversion near Ballynahinch | £19 | £189 |
| Build A Mansard Loft Conversion near Waringstown | £23 | £167 |
| Build A Mansard Loft Conversion 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 - £16,827

Two storey extension - £86,990

Build a timber frame extension - £25,327

Build a swimming pool - £80,327

Single storey extension - £41,537

Side return extension - £33,927

Install an RSJ - £1,527

Outbuilding - £9,327

Build a Mansard loft conversion - £51,327

Loft conversion - £27,439

Build a kitchen extension - £41,327

Hip to gable loft conversion - £41,327

Granny annexe - £86,327

Garden office - £9,327

Convert a Garage - £15,327

Garage - £17,827

Build a flat roof extension - £21,327

Build a dormer loft conversion - £41,327

Concrete foundations - £5,577

Convert a bungalow loft - £28,327

Convert a basement - £29,927