• 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.

  • 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.

  • @TW are you in Cardiff or did I imagine that?

    When we rented in a victorian terrace in Cardiff we could see into our neighbours loft, there was a huge gap between the chimney and roof joists that you could have climbed through. Can't imagine what sort of fire risk that poses.

    I never did steal their box Christmas decorations but thought about it all the time.

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