I am wanting to put up a 1.8m high (besser/cinder) block wall that spans 10 meters across our rear boundary. The wall will be tied to both other neighbours walls also.
The council water main runs 1.3 meters away from the boundary wall at a depth of 1.7 meters. This runs parallel to the new proposed block wall and trench.
What depth should the post holes go down to? I assume to the same depth?