I have sparrows in the soffit here,there’s a really tiny gap in the fascia,they can’t get into the loft space that way though. There is a tiny gap near the top bricks of the house at the side,they can get in the loft space that way (I need to get that cemented one day). I’ve always left the soffit for the sparrows nests,had the soffits done just over twenty years ago & always been a home for the sparrows,looks fine,sparrows very house proud,I haven’t needed to buy a box
maybe yours will be ok Q,if they can’t access the loft & they’re just in the soffit?

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