Is Party Wall Agreement required for new wall wholly on own land of semi-detached property

[rarpal]

We are planning a single story rear extension on our semi-detached property under permitted development. The extension will create a new wall adjacent to the neighbours boundary line, but wholly on our land. Even though the foundation will have to be excavated within 3 meters of the neighbour's property, as per our building regulation drawings, it will be to the maximum depth of 1 meters, which I believe should not be deeper than the neighbours foundation (the adjoining property is a  1950's 2 story house with no extensions).
Firstly is there an easy way to find out the depth of the adjoining property foundation ?
And if it is no more than 1 meters, then does that mean a Party Wall Agreement is not required ?
Would be most grateful for any information.

[Big Jimbo]

Providing you are not digging deeper than your neighbours footings, and the wall is on your land. Crack on. Don't forget to allow for any facia, guttering etc. Don't be overhanging the boundary.

[Temp]

+1

 

I don't believe you need a party wall agreement either.

 

The neighbours founds are very likely same depth as your own. So just dig a trial hole on your side.

 

Might be worth thinking about what happens if the neighbour likes your extension and decides to do his own. Will there be a very narrow gap that collects debris? Could you join your roofs together to get around the problem? Will you be able to access your eaves for maintenance? Consider a pitched roof?

 

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[Meechl85]

No you do not need a PWA because the wall is solely on your property. If you need to dig a foundation more than a metre, within 3 metres of your neighbours property then you would need a PWA because it could affect the foundations of your neighbour’s property.