So I'm moving back to the UK from the USA and I have my eye on a house in Crosby, fairly close to where the kid will be attending school. The house has had an 'observation deck' added to the rooftop, and it'd be (just about) big enough to put a dome on... You can see where I'm going...
I think I know the answer to this question But here's a picture, screen-grabbed from the promotional video of the house (those two are the agents...) - this is the best photo I have.
I guess, from reading, problems I'd be likely to run into would be thermals from the house itself, and lack of isolation of the pier with the rest of the house - there's no way I'd be putting a pier through the house to the ground...
The house does have grass around it, perhaps a purpose-built ROR building would be better, it just seems a bit of a waste to have the platform (which is probably fine for looking out to sea by eye) but not use it for a telescope