The next type of popular addition is a crawlspace. Another, and less expensive is on piers. And finally but inferior is a slab type. In the next "construction tips' ' we will discuss the pros and cons, along with the costs of the various types of renovation-additions full basement, piers, crawl space, plus slab type. I, with 55 years of contracting, always religiously discuss an honest budget. No matter what a client wants or an architect draws, you have to conform to the budget. Budget dictates everything. Also I also recommend an amount with funds reserved for any hidden problems or additional work, once construction has begun.