Building Regs and foundations....

[Norcon]

So why dig a trench 1m deep?

To waste concrete!

[noseall]

Even if ground conditions were perfect at one inch below the surface, you would still be wise to set them at a depth simply for protection and stability.

1m is a default setting that usually guarantees decent ground. I have built four or five extensions per year for the last 8 years or so and it is rare that the ground is not good enough at standard depth.

Building control do sometimes allow a shallower dig provided the conditions allow.

[Thermo]

move where its chalky

__________________
have grace to accept what cant be changed, strength to change what can, wisdom to see the difference