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Be surprised if they didn't need party wall agreement (assuming you're in a terrace/semi and no kind of loft conversion has been done before) for a loft conversion as they'll most likely have to cut pockets in the party wall for steels to support the floor.
The ideal would be to tell them that you don't want them to start the work until the party wall stuff is signed off (up to you whether you just agree to it or get them to get a surveyor in, I'd go with the latter). Actually getting them to agree to that may be harder work and I think your only recourse is to apply to the courts for an injunction.
At a minimum I'd take a load of photos of your party wall so you have some evidence if things are damaged.
A skip has turned up next door. Neighbours have vacated and builders are on site. Apparently they're extending back (single storey) and doing a loft conversion. This is the first I'm hearing of it – no planning/notification/party wall agreement/etc.
No planning is ok I think as it should come under permitted development. The lack of notification and party wall bit troubles me as I thought we were on good terms with the owners.
What are my rights? What should I keep an eye on? I'm happy for the development to go ahead, as long as they don't fuck anything we own/share up.