No window performs to its maximum efficiency if it's not installed properly. How a replacement window is installed significantly influences the performance of the total window system.

Installation of replacement doors, windows, shutters, and vinyl siding are not tasks for the casual handyman. These large-scale projects require the tools, skills, precision, and training that only comes from an experienced home improvement specialist. Windows and Doors specifically must be installed so that they float perfectly within the allotted frame. Without a master's level of precision, replacement windows and doors can be fitted and installed unevenly, created a lopsided final product. To ensure the highest quality installation job, it is best to put the project in the hands of an experienced contractor.

Replacing a window or door is a more difficult task than installing the first window or door in a home. Replacements include removing the previously set door or window, cleaning and prepping the area for a new unit, ensuring a level fit, and then setting the replacement window or door. Once placed and installed, new replacement windows and doors must be paneled, caulked, and trimmed properly. Otherwise, windows and doors could end up being drafty, uneven, misaligned, or leaking. To prevent these common problems associated with work done by "handymen" or "do-it-yourselfers", it is best practice to consult an installation professional.