Most homeowners embarking on any relatively ambitious home remodeling project need to have a general sense of the cost before taking the first step. It is possible to plunge into painting the living room or self-installing vinyl flooring in a small bathroom, all without tabulating project costs, since materials cost is typically low and the labor is free. But medium or large projects like additions, basement finishing, bathroom and kitchen remodels, and major plumbing remodels usually come with high enough costs that planning and preparation are necessary.
While no one can give you a firm remodel cost estimate without seeing your exact situation, it is possible to hazard a few rough figures for many of the most desired projects.