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EXTRA DEEP FOUNDATIONS

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Hi all.

Planning a small rear extension. Our post code is RH12 5XQ.

Building Control have told me due to the proximity of a neighbours mature oak I will need more than the standard foundations (i.e. option B below)

I need a ball park as to how much this is likely to cost, if it's as bad I think it will kill the budget and we won't be able to afford any of it and I won't bother getting the drawings done.

Tried a few local builders with this question but they didn't even bother to reply.


A) Standard 10 meters of trench 1m deep + 13m2 of concrete floor.

B) Standard 10 meters of trench 2m deep + compressible material + 13m2 suspended concrete floor.


What would be most helpful to us is, if someone could say something like;


for just the foundations and assuming there are no snags, then for each you're looking at around

A) ? thousand

B) ? thousand


Any ideas on this will be so helpful, thanks.
 
I would say the extraordinary spec' (2m deep found's, suspended floor etc) would add about £4k to the cost of standard jobby providing you have got large digger access and the floor beams do not require a crane.
 

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