Range from the cheapest, mostly independent, £15 per hour and £100 per day (Karl Moore House Maintenance based in BT4) to the dearest, normally the best, £21 per hour and £153 per day (The Method Group based in BT66).
Comparing hourly and daily rates of extension builders 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.
Rear extension to the back of a detached house approx l10m w2m h2.5m. with pitched roof
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
Extend back of house to create receptiom/dining area flowing from current kitchen + add decking area beyond the extension to create patio
We need extension builders like you to help local homeowners with their jobs.
| Job details | Estimate |
| Underpinning a house | £983 |
| Build a two storey extension | £3276 |
| Build a timber frame extension | £3276 |
| Install a swimming pool | £1965 |
| Cost to build a single storey extension | £26206 |
| Cost to build a side return extension | £30137 |
| Install an RSJ | £573 |
| Build an outbuilding | £1310 |
| Build a mansard loft conversion | £6551 |
| Cost of a loft conversion | £18344 |
| Build a kitchen extension | £6551 |
| Build a hip to gable loft conversion | £4914 |
| Build a granny annexe | £3276 |
| Build a garden office | £1310 |
| Convert a garage | £655 |
| Build a new garage | £1310 |
| Build a flat roof extension | £1114 |
| Build a dormer loft conversion | £1310 |
| Lay a concrete foundation | £1310 |
| Convert a bungalow loft | £1965 |
| Basement conversion cost | £18344 |
| Business name | Hourly Rate | Daily Rate |
|---|---|---|
| SM Plumbing & Heating, , BT7 | £20 | £136 |
| Extended living by Gilbert-Ash, 47 Boucher Road, Belfast, BT12 | £19 | £134 |
| Karl Moore House Maintenance, belfast, BT4 | £15 | £100 |
| McEvoy Building & Joinery, , BT6 | £20 | £137 |
| Glenn M Floyd Building & Joinery Contracts, Belfast, BT8 | £20 | £137 |
| M & M Construction, , BT36 | £20 | £135 |
| Belfast Loft Company, Belfast, BT17 | £20 | £138 |
| AK Building Services, , BT8 | £18 | £144 |
| Mount Oriel Conversions & Extensions, Belfast, BT8 | £20 | £137 |
| apex pharaoh ltd, Down, bt30 | £21 | £142 |
| Three Homes Limited, Lisburn, BT28 | £20 | £137 |
| Greenacres Construction & Landscaping, , BT67 | £20 | £138 |
| N W Doyle & Son, Ballynahinch, BT24 | £15 | £150 |
| R.J Builders, , BT67 | £21 | £143 |
| PC Building, , BT67 | £21 | £145 |
| Anak , larne, BT40 | £15 | £120 |
| The Method Group, Gibson's Hill, Craigavon, BT66 | £20 | £153 |