Had one of the little beggars in the loft a few years back – a whole lot of noise above the bedroom, on Christmas eve for good measure !
Out predecessor’s builders had extended the bays at the back of the house so they met the eves – so the eves formed a nice (tree) rat-run from one side of the house (where the eves were open) into a space above a second bathroom on the other. I’d found evidence of a nest there before, but didn’t think too much of it.
All I needed to do was make sure there was bird food outside, then nip up the ladder and cover everything in with chicken wire while I thought it was out foraging.
We had a recurrence later ‘cos I’d tried to be tidy with the chickenwire – where it/another squirrel could reach an adjoining timber batten, it munched through to push the wire out of the way/squeeze through.
Just had to repeat the above and lob up *way* more chicken wire so there was nothing it could reach to chew.