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Doing a Benchmark for our firm and just need to clarify following. With an invert level of 1.5m does the foul drainage manhole need to be circular min 1050mm dia and with steps? Does same apply with surface water manhole at 1.5m invert? Thanks for ay info.

double post

Got a 7 year old chalet bungalow with upstairs accom purpose built with attic trusses. Have velux windows to one flank, but i want to put dormer windows on opposite flank to give more headroom to the room. Im looking at 2 dormers about 6'-8' long each. Planning have said my property was...