Depending on the size of a piece of glass in your window, window glass repair could be a do-it-yourself afternoon project, or it could mean hiring a trained professional for skilled window glass repair or sash replacement.
A typical home window includes the wood frame, glass set in one or two sashes, interior trim molding, and exterior molding. The glass panes in modern windows are often two or three panes, separated by inert gases (argon, krypton) that prevent energy transfer and boost insulation.
A break in a single-pane window is often a homeowner repair project (with help from a hardware store that cuts and sells glass). For sashes with energy-efficient, multiple glass panes, enlist professional help.
For energy-efficient glass, replacing the entire sash is usually your only option, at a cost of $40 to $250.