I recently had to quote for a double garage with store room above. This needed piled foundations due to a large oak tree nearby.
I got 2 quotes for the piling.
One was for about £5,500 + vat
The other was for £10,000 + vat
This excluded the ring beam. It was only for the piling (12 piles @ 300mm diameter)
Piles down to 6 metres. After that it could cost extra.
Customer still thinking about it..............
The difference between the quotes was a bit worrying but until my customer makes a move I'm not going to waste any more time on this project investigating into the piling quotes.
This is for High Wycombe area. Hope this helps