Remove the inside stop pieces from the window. Take care when removing these pieces, you'll reuse them when installing the new windows. 2. Remove the inside sash. 3. Slide the outside sash to the bottom of the window. 4. Clean the window jambs and sill thoroughly.

For a standard size, double hung, double pane vinyl window, expect to pay between 450 and 600 dollars, including installation. Wood windows are more expensive. The cost of a wood replacement window can range between 800 and 1,000 per installation.