Piled foundation cost

[Bonner]

After saying never again, we are looking at another self build ‘opportunity’! The plot is ideal in terms of size and location but the compromise is soft clay requiring piled foundations. A full ground investigation has been done by the vendor which concludes that piling is definitely required. I know it is a piece of string question but can anyone suggest a reasonable cost difference between strip founds and ‘standard’ piles + ring beam? Looking at 220m2 two storey house with simple form factor so 110m2 rectangular footprint, timber frame and brick skin. TIA

[MPx]

No recent knowledge so unlikely to help, but FWIW:  In 2012 we had a pile and ring beam foundation done due to unstable ground.  Not a regular shape (you need support for any internal load bearing), but approx 55 linear meters using 44x 9m piles with a ring beam and a few pins cost £27,480.75.  But how much for strip foundations in 2012 to compare - no idea???

[Bonner]

Thanks. I know I will need to talk to a piling contractor in due course. Just trying to get a feel of the cost risk for valuation purposes. From fairly recent experience I can estimate the cost from ground up, just go no idea if I need to add £10k, £30k, £100k for piling.

[Mr Punter]

I would think £35k extra would do it assume 300mm piles up to 6m.  £20k piling £15k ground beams.  You could get indicative quotes based on your ground investigation.