If you've decided to rent out your property and move elsewhere, you'll need to let your insurer know. Once you become a landlord you'll likely find that your current buildings insurance policy will no longer be valid.
In most cases you can call your existing insurer which will simply 'upgrade' your ordinary home insurance policy into a basic landlord policy.
However, while this new policy will cost more, you'll normally find that simply upgrading your insurance will leave you without important landlord-specific extras such as loss-of-rent guarantee or public liability insurance.
Instead, it's usually better to look out for a specialist landlord policy that includes all the add-ons, as well as basic contents and buildings cover. Ensure you get the cheapest deal by doing a landlord insurance comparison.