Range from the cheapest £18 per hour and £134 per day (Extended living by Gilbert-Ash based in BT12) to the dearest £21 per hour and £144 per day (AK Building Services based in BT8).
Comparing hourly and daily rates of Extension Builder's gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Click 'Get quotes' and describe your job and we will send it to your local extension builders for FREE.
yesterday
Rear extension to the back of a detached house approx l10m w2m h2.5m. with pitched roof
17/09/2024
Hi there, I'm looking for an estimation of a retaining wall between 2 properties. Is around 20 m long. Please get in touch to visit the property for an accurate estimation. Thanks
17/09/2024
3m x 8m extension rough quote single storey. 4m x 8m extension rough quote single storey Back of house, kitchen and dining room. If under 70k then interested in cost of 3m X 11m with roof garage being raised. Looking for quotes, no ready to commit until next year
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See table for all Extension Builder rates in Belfast City Centre
| Job details | Estimate |
| Underpinning a house | £984 |
| Build a two storey extension | £3280 |
| Build a timber frame extension | £3280 |
| Install a swimming pool | £1968 |
| Cost to build a single storey extension | £26237 |
| Cost to build a side return extension | £30173 |
| Install an RSJ | £574 |
| Build an outbuilding | £1312 |
| Build a mansard loft conversion | £6559 |
| Cost of a loft conversion | £18366 |
| Build a kitchen extension | £6559 |
| Build a hip to gable loft conversion | £4920 |
| Build a granny annexe | £3280 |
| Build a garden office | £1312 |
| Convert a garage | £656 |
| Build a new garage | £1312 |
| Build a flat roof extension | £1115 |
| Build a dormer loft conversion | £1312 |
| Lay a concrete foundation | £1312 |
| Convert a bungalow loft | £1968 |
| Basement conversion cost | £18366 |