The method for preventing access to winter pests is the same for most pests. Check around the outside of your property for small access points and then seal them up. Rodents only need small holes to get into a building.
You can also make your home or business less attractive by ensuring that bins are always securely closed and a fair distance away from the property. Also don’t leave foodstuffs on worktops or on the ground.
Inside, be sure to check any unused spaces at regular intervals so that you can identify an infestation as early as possible.