Does a person's Wudu' become void if they pass over impure places in the house?

It is clear from your questions that you are afflicted with waswasah (obsessive whispering/doubts), and we warn you against indulging in it, as it leads to great evil. If you are certain of the presence of impurity, purifying it is easy by pouring water over it. As for the transfer of impurity to your feet, there is a difference of opinion on this matter, and it is permissible for you to adopt the view of those who hold that it does not transfer, as long as you are afflicted with waswasah.