You will need to know the rebuild cost of your second home, not your home’s market value, and the value of your belongings to be insured.
You will also need details of the property type, number of bedrooms, the year it was built, how it's heated and a few structural details e.g. what the exterior walls are made of, type of roof and how much flat roof space you have.
Any claims you have made in the last five years and if the property has ever suffered from flooding or movement caused by subsidence, heave or landslip.
What window and door locks you have and if you've got a burglar alarm.