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T.I Building is a trusted extension builder serving customers in Hillsborough and the surrounding area. Contact us to today to get a competitive qu...
Need to find an Extension Builder near you for all your extension buildering work?
Mount Oriel Conversions & Extensions provides a local, t...
From £21,384
Relax... you have found a reliable extension builder in Hillsborough. Finch Construction NI is a friendly and reliable company based in Hillsboroug...

A flat roof extension ranges from the cheapest of £21,136 (Mount Oriel Conversions & Extensions based in BT8) to the dearest of £21,400 (T.I Building based in BT28), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Hillsborough by posting a job with HaMuch. We'll send it to extension builders in Hillsborough.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Hillsborough and Culcavy | £25 | £170 |
| Build A Flat Roof Extension near Lisburn | £24 | £164 |
| Build A Flat Roof Extension near Maghaberry | £31 | £205 |
| Build A Flat Roof Extension near Ballynahinch | £19 | £189 |
| Build A Flat Roof Extension near Carryduff | £23 | £158 |
| Build A Flat Roof Extension near Saintfield | £23 | £162 |
| Build A Flat Roof Extension near Waringstown | £23 | £167 |
| Build A Flat Roof Extension near Banbridge | £29 | £205 |
| Build A Flat Roof Extension near Belfast | £23 | £161 |
| Build A Flat Roof Extension near Crumlin | £26 | £194 |
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 - £16,807

Two storey extension - £86,960

Build a timber frame extension - £25,307

Build a swimming pool - £80,307

Single storey extension - £41,133

Side return extension - £33,700

Install an RSJ - £1,507

Outbuilding - £9,307

Build a Mansard loft conversion - £51,307

Loft conversion - £27,250

Build a kitchen extension - £41,307

Hip to gable loft conversion - £41,307

Granny annexe - £86,307

Garden office - £9,307

Convert a Garage - £15,307

Garage - £17,807

Build a flat roof extension - £21,307

Build a dormer loft conversion - £41,307

Concrete foundations - £5,557

Convert a bungalow loft - £28,307

Convert a basement - £29,700