Cost to add a bathroom on the second floor, directly above the first floor bathroom?

I am trying to estimate the cost to add a small bathroom with a sink, toilet, and corner/stand up shower on my second floor. The bathroom would be directly above a bathroom on the first floor - but would need walls. The ceiling and wall that the bathroom would be built up against already has wiring and electrical outlets.|||Adding a basic 6x8-foot bathroom addition starts around $25,000 and goes up depending on complexity, quality of fixtures, number of amenities and local labour rates, because of all these reason the above price can only be a guesstimate. RemodelingOnline pegs the price of a 6x8-foot bathroom addition at an average of $36,000 in the Midwest, $36,700 along the East Coast and $40,000 in the Western states. These prices are all-inclusive for projects using good- to high-quality materials, with work performed by a skilled and licensed remodeling company.