[cypher]

Changing the layout of the cage can be quite stressful for them so that could explain it, they do usually adjust ok if you give them a little time to settle again.
If the construction work is noisy then that would be enough to disturb him & stop him from wanting to come out, keep him as quiet as you can & try to reassure him if he does make an appearance.
Do keep an eye out for any signs of ill health, he probably is just a bit stressed rather than sick but stress can make them ill too.