Should builder correct bottle gulley mistake?

[flanagaj]

Our plans clearly state that our sink waste was via a back inlet bottle gulley.  Exactly as the image from Wavin below shows.



The builder ignored my plans and instructions and decided to not put lintels in for the soil pipe to exit through the property.   I then had a long argument with him regarding this and he said that you don't do this and a bottle gulley is used in the old school way, with the sink waste exiting through the wall.  He's talking complete tosh and I have just sucked it up.

The one benefit is that it means one less hole in the Radon membrane to have to worry about the detailing for getting it sealed correctly, the downside is an ugly pipe (albeit on the Northern side) which is just a path at the back that you don't really notice.

But it's really niggling me and I am wondering whether coring a hole through the wall it going to cause other issues later on?