You can repair sash windows but you should replace them. You may notice that over time, you’ll spend more money on repairing the window, making it a less cost effective option. Replacing an entire window will be the most cost effective solution, as our sash windows have been carefully crafted to stand the test of time and are competitively priced. The modern design will not rot, warp, fade or crack, meaning you can enjoy your new windows for years, without the need to repair or replace them.