A: You will need to notify your insurer prior to carrying out any works. Insurers will take a number of things into consideration when assessing whether they can continue cover for your property i.e. will the property be unoccupied? Will the works be structural? etc.
If you are carrying out minimal decoration works, your existing insurer may be able to continue cover. However, they may apply a number of terms and restrictions such as an Accidental Damage exclusion or a Theft restriction. A standard policy will not provide cover for your unfixed materials, whereas a specialist renovation policy would.