The varied price for a home addition is perhaps one of the most understandable to be difficult to pin down. Aside from the size of the addition, it matters what will be going in that new space. For example, a new bathroom or enlarged kitchen will cost more than just expanding a family room, simply because there are more materials in the room that’s being built. If your addition will include a kitchen or a bathroom, you may want to consider the prices we’ve shared for how much it costs for a kitchen or a bathroom remodel, to be used as a starting point. Some spaces are so commonly chosen as home additions though, that our friends at Remodeling Magazine cover them in their annual Cost vs Value report. They suggest that a midrange primary suite addition that includes a bedroom, bathroom and closet may cost $202,757.