Estimating exterior home improvement costs is typically straightforward, unless you are hiring one company to do everything: pour the concrete driveway, attach the siding, install the windows, among other items. These projects as individual items generally have a static cost on labor, and what that means is that the variance of the estimates will hinge on the grade of the materials. High-end windows can really drive up costs, whereas lower siding costs can free up some room in that budget. Make sure that you gather several estimates so that you can get a clear picture of the proposed overall costs, and also determine which contractor is going to give you the most for your money.