We have lived in our house many years. New neighbours to one side where we have very little space between our house and a brick wall. Other side of the brick wall is their side access and door to their kitchen.
A few years ago we spent quite a bit of money putting in a better drain on our side for our utility / laundry room, included digging up the driveway for better drainage pipes etc. No shared drains though.
This side area is very, very narrow and as it is,quite difficult to do maintenance due to lack of space. As it’s quite dark there, DH has some work every few months clearing out moss etc to ensure nothing get into the drain (even with drain cover). We have recently moved our kitchen to this side of the house, so we have additional use of this drainage with kitchen sink and dishwasher. Have already had dynorod out once this year to clear a blockage.
New neighbours would like to create some type of covers area their side and use our drain for run off, putting guttering on our side of the brick wall (which is directly in the boundary). Guttering would be head height. Drainage to go into our drain. It would be easier for them if the drainage snd guttering were on our side.
I said whatever they wanted to do their side of the brick wall is no concern to me but no, we didn’t want the guttering on our side and no, we didn’t want them to use our drain. It would fall to us to keep it clear of moss (lots of moss already falling into this area from their roof but didn’t say that) and blockages, that we didn’t want extra things to worry about maintaining this or having to ask them to do so, would not be easier for us.
Now I’m wondering if IABU to have said no. Also wondering if they can just go ahead and do this. Would we have any recourse?
To put into context, we used to have a shared drain with house on other side (was in our driveway) and we would often have blockages that were caused by our neighbours - who never shared cost of clearing. Thankfully, when major renovations were done, the plan included installing their own drains.
We don’t want a repeat of lots of blockages that we have to deal with (and pay for clearing).