Last time we did a renovation and the house was going to be "empty" for more than 60 days I called the insurer (Commbank I think at the time) and they made a note that we were renovating. Had anything happened, our excess went from $500 to $2000 or something like that, because it was unoccupied. It was still covered for everything the policy covered normally.
The funny thing was that while we were almost living there renovating it from early until late most evenings, our own house was almost "vacant". The insurance company should have been more concerned at how long we were away from our own house whilst we were almost living in the IP
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This question has just reminded me that today it is two months since the house we are renovating was vacated. Lucky the new tenants go in tomorrow.