Wearing shoes indoors seems to be an American norm. Asking guests to remove their shoes can be inhospitable or even rude to some. When your client is having an viewing or an open house, they may ask you if guests can remove their shoes upon entering. Make the following considerations below to see if requiring guests to remove their shoes would be appropriate for your open houses or showings:

Source: http://blog.zurple.com/disposable-shoe-covers-for-open-houses-polite-or-pretentious