I have used a mini-access chamber 300mm diameter (floplast from
screwfix). Max height 600mm (in line with building regs). All exposed
at present / no infill. The drain was a little deeper than I thought
and and height from invert to ground level is around 700mm. Max height
with risers = 600mm, but I am going to use an inset lid over the whole
thing anyway, to contain the patio paviours, i.e. there will be the
plastic lid and another cover over.
How likely is it that the BCO will fuss about the depth from ground
being a little over 600mm ?
Thanks,
Simon.