eidolon;30490010 said:
It's got a shared roof (what's left of it). So you don't think I'd be able to knock down my side even though it's falling down anyway?
Doubt it, you can't just cut a building in half and be sure the other half will still be safe and standing. We had a similar thing, and when my new neighbour moved in and wanted to take his side down to build an extension, we negotiated a deal where he took the whole thing down, left us with a slab for a new shed, replaced the fence and we contributed a small sum towards the cost (£300).
Ours was a single skin brick building, with reinforced concrete roof that had cracked and was letting in water, so we wanted rid of it anyway. It was an opportunity that our old neighbours didn't want to take, and our new ones needed to get sorted for their extension. You couldn't really take down one half, as that would have left the open side being a weak ineternal wall, rather than a solid exterior wall to hold up the heavy roof. And I suspect trying to get a clean cut through a reinforced concrete roof would have been impossible, and the cracked half on my side would have collapsed and been unsafe.
IIRC, it did come under party wall agreements, so you can't just be knocking things down, and as you're the one that wants to do it, you're the one that will end up paying.
If it goes to party wall surveyors, it can get expensive quickly, and you'll pay for that as it is considered that you're the one that gains advantage as it's what you want to do.
You really need to contact the owner, get an agreement, and probably bite the bullet and pay to take the whole thing down. If you're lucky, the owner may want it down and will be be happy with you carting the lot away. If you're unlucky, he may expect you to pay for a replacement of his shed.
If you knock down his shed, or it comes down accidentally, you open yourself up to all sorts of legal issues, especially if someone gets hurt eg it collapses on someone next door because you took down your half.
