Have a look online for designs to build them a nest mate.and get it screwed up as soon as. they might get in there within a few weeks.
We have 2 nests of sparrows in the roof every year.the wife keeps the bird table stocked up for them.
You can sit on the patio and they fly down over your head every minute it seems to the table and back.
And yet you can't hear a noise from the bedrooms of bathrooms below the nests.