Does addition soil pipe require venting?

[vala]

Had an extension at front of the house for a utility/wc and a new soil pipe was installed which connects into the existing. The run consists of a 1m straight, 90° bend, followed by a 8-9m straight before connecting into the existing drain.

This has been installed for a toilet, basin, washing machine/tumble dryer.

Does this need to be vented separately to the original/main stack?

[Nickfromwales]

8 minutes ago, vala said:

Had an extension at front of the house for a utility/wc and a new soil pipe was installed which connects into the existing. The run consists of a 1m straight, 90° bend, followed by a 8-9m straight before connecting into the existing drain.

This has been installed for a toilet, basin, washing machine/tumble dryer.

Does this need to be vented separately to the original/main stack?

No, it doesn't.

 

If the invert (drop from one end to the other) is <1300mm then you don't even need and AAV (air admittance valve, aka a "Durgo"), so all I would do is make the 90 bend an inspection bend LINK so you can rod down the 8-9m run, and back into the 1m run for self-maintenance.