Hi everyone,
As per my username, I am capable of doing stuff but don't necessarily know all the regs etc so would welcome advice please.
Probably inviting ridicule for what may be seen as a stupid question but having searched all over I can't actually find an answer.
I'm doing a fairly large extension and my SE has advised footing depths of 1100mm. My question is, where is that measurement taken from?
Are the stated foundation depths measured from:
a) the finished ground level (the patio will be built up by 450mm or so to meet the internal floor level)
b) the existing ground level
c) or from the top of the existing concrete foundations of the existing building
Basically, are the depths stated by the SE the required thickness of concrete or just to the bottom of the trench (so where the existing footing of the building is 600mm below the surface, it would mean that the stated 1100mm depth footing would mean a 500mm depth of concrete to be poured)?
Many thanks!
