Home extension building regulations - building close to/over public sewer. What is classed as a publ

I'm trying to sort out this application form that arrived the other day about building close to or over a public sewer. The guidance notes say that you only need get approval if you are building within three metres of a public sewer. My L shaped extension will cover over part of the drain running from the soil stack out towards the outlet on my neighbours property, the entire run from the back of my house to the middle of the manhole cover is some 6 .7 metres and the rear part of my extension is only going to be 2.8 metres wide which, if this is not classed as a public sewer, will mean I don't need permission.

Basically what I want to know is which part of the drains is classed as a public sewer?

Home extension building regulations - building close to/over public sewer. What is classed as a public sewer?tickets

What you have is a private sewer and it remains a private sewer until it reaches the pavement or highway, then it becomes public. If there is a blockage at any point it is joint resposibility of all the houses it services to share any maintenance or unblocking chages. On the good side as you are at the head of the drain run then any work you do is not going to affect anybody else, except yourself .....and you won't have to watch other peoples waste floating by. When I built my extension I needed a wall going right through not only a drain run but also the manhole. it seemed complicated but was easily sorted in the end. My invert level was 1.8 (depth of drain) and unfortunatley my footings had to go that deep too. (unforseen extra expence)

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Home extension building regulations - building close to/over public sewer. What is classed as a publ

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