Not as far as I know. Bats seem to be particularly picky when it comes to roosts - and that doesn't mean they'll always colonize even the most sumptuous quarters.
The best way appears to be to ensure that they have a decent supply of food in the way of insects - and that's work that can be done in the garden. Plenty of moths is what's required, and plants like Honeysuckle will pull in hundreds of 'in flight' meals every evening in the summer.
Might be worth getting in touch with your local 'Bat Warden' ( bound to be one, or something like it ) for specific advice to your area.
Are you really sure you want them? Could be a real turnoff if you try to sell. Rabies is spreading through the bat population, and has already infected one, or maybe two, bat wardens in Scotland. I wouldn't buy a house if I knew there were some. There are now new rules so once there if you want to move them, you have to build them something similar in size and style to what you are ejecting them from. I heard a sorry tale on radio 4 of someone who had to build a large barn-type structure costing many thousands with no guarantee that they roost there.
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