Help with Peregrine Nest Box

 I’ve spotted a male peregrine who’s taken to roosting in a local Surrey building. A few years back I’d have thought this was a rare thing, but can anyone advise if they’re becoming more common, like red kites? Also, he seems a bit lonely. Does anyone know if there’s any programme that would support installing a nest box on this building, assuming permission could be obtained? The whole building facade is very exposed and doesn’t offer a breeding pair any cover.