If I want to lay new drains and/or install a septic tank within the boundary of my property, will the Building Regulations apply?
YES – they will apply to new rainwater or foul drains inside as well as outside the building. The Building Regulations also apply to all non-mains foul sewerage arrangements (i.e. those using septic tanks), including their outlets and drainage fields. (See also paragraph 3.3 which refers to proposed building work close to or on top of drains). If the work involves a drain which is less than 750mm below the surface of the ground and you employ an installer registered with the Institute of Plumbing, you will not need to involve a Building Control Service *. Except in an emergency, your local authority should be given at least 24 hours notice of any intention to repair any underground drain (section 61 of the Building Act 1984).
