Are window treatments included in buying a house

Depends on the contract and the type of treatments. Generally, that which is attached to the house is included -- so, the rod that is attached to the walls is generally included but the curtains just hanging on the rod are not usually considered to be attached to the house. Blinds that are attached to the walls are generally included. It is best to write in the contract whether the window treatments are or are not included.  If this was not done, then it will generally depend on whether the treatments were "attached" like the above examples.