New Fence Post Positions

[malagabob]

My neighbour has organised a builder to erect a new fence including new fence posts between our properties. I had a discussion with the builder as to his method of what he would do, pointing out the plants and shrubs that run the length of fence my side. He said the new fence posts would go more or less in the same position. Here’s where the problem lies. The old posts were put in years ago before a new single story extension was built. It’s obvious now , looking at the extension finished face the old posts are on my side. What’s the law regarding placing new posts. I seem to believe the face of the new post furthest away from my neighbours property, should be in line with the extension face. Only the footing can extend into my property. Thank for any links.

[The Builder]

Bob, you don't say whose extension it is....... yours or his?

Anyway, with extensions, good practice dictates that nothing should be undertaken on neighbouring ground. Foundation trenches should be dug with the outer side of the trench being at the position of the boundary. The footings should be wholly within the extension owner's property.
This works in practice because the face of a wall is not the extent of the extension. Up above the wall-face will likely be a fascia or barge board which may be overhanging. Also, there is often guttering. None of this should sail over neighbouring property.

Back to the plot... put the new posts in exactly the same position as the existing ones. After the passage of time, a line has clearly been established. Altering it could easily lead to argument.
Unless it's a huge problem, things are often best left well alone.

[malagabob]

Builder. To clarify, it’s my neighbours extension. The wall of this was built out at a 90 degree angle obviously.from a exact position midway from the middle of the property’s ( semis identified by an expansion gap ) As said the existing posts are on my property. With the post face furthest from my neighbours property. Taking out posts now, and replacing with new would disturbed mature plants via cutting roots. Additionally the neighbour ,the wife, made it clear she wants thin lap fence. As the orientation is West facing ( this builder didn’t even know where West was )I said wouldn’t it be better to have 12mm planks with mini gaps to allow the pressure of wind to dissipate. She’s adamant she wants lap. Thanks