Build over agreement

[Ianmg]

Do I need a buildover agreement over a private sewer. Recieved a letter from building control stating a buildover agreement may be required. Yet we are building over a private sewer and 8m away from where it joins the public one. The blue hatched markings is the extension. Private sewer blue line public red line

[Conor]

No, by you'll want to move that sewer regardless. Just reply to BCO saying it's your sewer and provide an updated drainage plan. Your designer should have accounted for this in the application anyway.

[Russell griffiths]

As Conner said. 
you won’t be building over it, you will need to move the two inspection chambers outside the new extension. 
then the only pipework below the extension is your direct feeds to the new chambers. 
so the drain runs are yours only. 

[saveasteading]

2 hours ago, Russell griffiths said:

you will need to move the two inspection chambers outside 

And probably extend drains that currently go into them. Presumably you know what flows where.

[Ianmg]

Yes inspection chambers moved and BCO accepted its our sewer so pretty straightforward in the end