A build over agreement in HA3 post code.

The existing manhole within the extension footprint will be relocated outside the new building line, with a new access chamber positioned along the sewer flow to ensure continued inspection and maintenance.

A precast concrete lintel with 150mm bearing will bridge the sewer pipe to prevent direct loading, while trench foundations on either side provide stability and a 150mm pea shingle surround protects the pipe and supports drainage.