f I had a building that swallows, swifts or martins nested in I’d be very happy
Don’t get me wrong, I am, but they don’t just crap out of the nest, they perch on various bits of pipework and stuff and crap from that too. And crap whilst flying in, around and out. And they’re not actually stables anymore, one is basically a garage and the other a utility room, so crap on the top of the washing machine isn’t very nice 🙁 Plus, the nest they built is literally on a light fitting, so not massively safe.
For an artificial swallow-box, you need something more like Swallow box perhaps with one of these? underneath it. The box though does ideally need to be installed under shelter rather than outside.
Ta. They can be really well tucked up under the eaves of the ‘outside bit’ of the stables, no issues.