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Hi thank you for your message, it is part of best practice for example the chartered institute of environmental health recommends rodent protection be incorporated into building plans and this is therefore sometimes incorporated into planning permission. In particular where drains and sewers enter and exit the building they should be sealed to prevent a rodent infestation. I hope this helps, if you can please accept my answer and rate me 5 stars (in the top right of your screen) then Just Answer will credit me for helping you today.