Major facts to prevent Rodents:-
Seal all the cracks and holes outside the premise, including areas where utilities and pipes which enter the home.
Store food in airtight containers and discard the garbage regularly.
Keep loft, basements and crawl spaces well ventilated and dry.
Remove all moisture areas like leaking pipes and blocked drains that provide the perfect breeding area for pests.
Rodent control is necessary and desirable because they can spread disease either through direct contact or as a vector for another organism.
It is best contact a professional pest control service to keep your premise Rat free. Inspection is an important step to prevent rats.