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Blue tit... Can I block access without causing harm?

Just a few days agoI started work on a house to remove and replace fascia boards. Unfortunately on return to site today a blue tit has decided to nest in newly exposed eve and is building nest. I need to cover this in the next week. Any advice please? If she is still building nest, does that mean that she is yet to lay her eggs and therefore I can cover off hole without causing harm? New fascia is Upvc and it is not an option to leave nest site open for next month or two. Thanks