Help with soil vent pipe height

[amin]

I’m looking for some advice on the positioning of a soil vent pipe (SVP). I’m converting my loft and adding a bathroom directly above the existing bathroom, so there is already an SVP in roughly the right location. I’m also adding a velux window on that elevation. As a result, the SVP ends up very close to the window.
 

From what I understand, that shouldn’t be an issue in principle, but it does mean the vent needs to be at least 900 mm above the window opening. I’ve attached a sketch showing the existing arrangement in blue and the proposed arrangement in red.
 

My concern is that this creates a fairly tall, exposed vertical section of pipe (around 2.5–3 m) near the pitched roof. I can lightly restrain it back to the chimney, but it still feels like an awkward solution.Does this approach work in practice and comply with regs, or is there a neater / more sensible way of dealing with this?

 

Any advice appreciated, thanks!

 

 

 

 

 

Edited 2 hours ago by amin

[Russell griffiths]

Cross over behind the chimney and run up the side of the dormer.