One of the most costly remodeling mistakes that novice DIYers make is ignoring a home’s original design. If you bought a Craftsman-style bungalow, why would you plan a midcentury modern remodel? You wouldn't renovate the interior of a Victorian Painted Lady to look like a Spanish Colonial. Stick with the original style or sell. That way, you'll have a chance of fetching a higher sales price, because a buyer who's in the market for a beautiful historic home will want the interior style and the exterior to match.