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There seems to be a first mover advantage here
Well, it means that if you do the same, and have the horrible flashing bodge, then both you and the neighbour put themselves in to a world of hurt later down the line.
I wonder if you could actually prevent them from doing this, even with a surveyor acting in your interests. The best you could hope for might have been to go halves on extending the party wall up.
Friends of ours down the street agreed with their neighbour to split the costs of having it re-done properly when they converted theirs, so that now they have a brick firewall between them.
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The best you could hope for might have been to go halves on extending the party wall up.
A Party Wall Award will cover this (in kind), in that the person doing the work pays first pays for the wall, and the person enclosing upon it down the line will pay 1/2 the cost of the wall at current rates. Seems fair and by far offers the most robust solution. Those flashed-together dormer boxes with questionable separation leave a lot to be desired.
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Our current place is a Victorian semi, where both houses were on sale at the same time, and we bought the one with the loft already done.
The neighbours went into their loft, to find that between their loft and our extension, there was no wall at all - their loft backed onto plasterboard and our eaves.
There seems to be a first mover advantage here - at our old place, the neighbours went into the loft and their dormer goes to the center line.
At one stage we wanted to go into the loft too, and would have needed to either build up the whatever-the-upstand-bit-is-called, or have some awful bodge with flashing over the top to stop crap getting into the gap.
My wife, who was the owner of the property, naively signed the party wall agreement. What she should absolutely have done was to have insisted on her own surveyor. Nothing but aggro because of not doing so.