I use Visio for drafting home renovation plans. It isn't the easiest tool to use for this purpose but the results are good enough to save me the expense of hiring an architect, and the city government hasn't complained. So a set of primitives for architecture would be appreciated and might get me to move off Visio. Related to the architecture primitives, a set of furniture and cabinetry primitives would also help, as they help to visualize how reasonable a building design may be.