Range from the cheapest, mostly independent, £20 per hour and £160 per day (HMS Property based in ST7) to the dearest, normally the best, £28 per hour and £210 per day (Greenwood Building Services based in ST5).
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.
16/07/2024
Want to convert the loft in a terraced property. Property is 3.5m wide and 8m long. Assumptions: Ceiling joist will need to be removed New loft floor joist installed at lower level than existing ceiling joists Conversion needs to be building regs compliant How much would it cost for a velux conversion and also a dormer conversion. For the dormer conversion the whole roof space would need to...
08/04/2024
Build a sun room to rear of house.
21/09/2024
Add a 4x4m extension to house at rear garden with windows and a toilet
We need Extension Builders like you to help local homeowners with their jobs.
| Job details | Estimate |
| Underpinning a house | £1416 |
| Build a two storey extension | £4720 |
| Build a timber frame extension | £4720 |
| Install a swimming pool | £2832 |
| Cost to build a single storey extension | £37761 |
| Cost to build a side return extension | £43426 |
| Install an RSJ | £826 |
| Build an outbuilding | £1888 |
| Build a mansard loft conversion | £9440 |
| Cost of a loft conversion | £26433 |
| Build a kitchen extension | £9440 |
| Build a hip to gable loft conversion | £7080 |
| Build a granny annexe | £4720 |
| Build a garden office | £1888 |
| Convert a garage | £944 |
| Build a new garage | £1888 |
| Build a flat roof extension | £1605 |
| Build a dormer loft conversion | £1888 |
| Lay a concrete foundation | £1888 |
| Convert a bungalow loft | £2832 |
| Basement conversion cost | £26433 |