Gummo

Because of the diverging views offered, I'm unsure what my rights are to the extent that I may have no grounds for asking let alone having a say on whether he does work to the wall. Indeed, I'm not sure if I own the wall.

I'm not qualified to know if they will or not and I'm fairly sure building control and planning won't be consulted.

I've just learned of "adverse possession" which suggests that my 39 year-old extension is potentially entirely on my property and that the wall in question is not a party wall. Any thoughts?

Presumably he'll need a safety railing.

He plans to run joists from the top of his single-storey extension wall, across his narrow yard to my extension wall and top it with decking. Both walls are plastered concrete block with cavity.

I talked to the planners yesterday - they say that planning permission isn't required before installation but, if he contravenes regulations, the structure will be in trouble.

The extension, built in 1981, runs along the line of the old scullery that was there beforehand. You may infer from the attached diagram that the old scullery's exterior probably aligned with the furthermost line of the party wall.

I'd need some expert advice on the integrity of his fixings and the joists' impact on my wall - on an extension whose join to the old house has been filled several times in its history due to settlement. That's my main concern; the next concern is the parties that undoubtedly will ensue.

The chimney is his (my fireplaces are on the other side). It's looking very much like it's a party wall after all. ?

So, using that logic, it is almost certainly a party wall. If so, how do I have the right to stop such fixings?

The water from his gutter runs onto mine and is released via the downspout on the other side of my extension. The only indicator of the boundary-line, according to some people, is that it's the centre-lineof the chimney.

Others say that the centre-line of the chimney is the boundary.

His chimney and mast.

I'll mention it the next time I bump into him and ask him to show me exactly what he plans to do (before he engages someone to do plans). If he says he definitely intends to attach to my wall, I'll have to turn him down as gently as possible.

It's his.