Drainage below ground


All foul and surface water drainage systems shall be adequately watertight, and tested where appropriate.

Inspection and testing should be arranged when required by:

  • the local authority
  • the sewerage undertaker
  • NHBC.

Before backfilling, visual inspections are required and the builder is advised to test. When the home is handed over, the system must be in full working order and free from obstruction.