Connecting gutter to waste pipe?

[Ant1]

Hi all,

I need to install a new gutter and replace its down pipe (circled in red in the attached photo).

However since I already have a waste pipe (circled in green), I wanted to know if I could simply decommission the down pipe and connect the new gutter to the 110mm grey waste pipe; I believe would just need to convert from 68mm to 110mm, depending on the gutter I purchase.



This is a very old house from 1870, there is no separate drains for rainwater, basically wastewater and rainwater all get collected at the same point at the bottom of the house. Hence from a legal perspective I think I should be ok, would you agree? Or is this a no no?

Attach below is a photo of the building opposite to mine, all of the gutters are connected to the waste pipe, as I am proposing:



Thanks!

 

[23vc]

The setup in the pic of across the road looks a bit pointless as the vent tees off and goes higher but it’s going to vent into the gutter
So yeah you may get away with it but I doubt you’re meant to do it that way, might not be high enough above the windows