Guest bathrooms are a typical size of about 5’ wide by about 8’ or 10’ long. These bathrooms are often used by the kids and are deemed the “kids bathroom” in houses where there are no guest rooms but kids rooms. These bathrooms generally have a tub/shower combo, a toilet next to the tub and a single vanity or in some cases a double vanity, depending on the length of the bathroom. The costs of remodeling the guest or kids bathroom sill run around $20,000. The costs of the remodel will depend on the size of the bathroom, the number of fixtures being replaced, the number of cabinets, and the type of finished selected to go into the bathroom. A guest or kids bathroom will average about (1) month to refinish.