An insert for one window typically costs between $350 and $800 installed, which is less than or equal to the cost of the next option for soundproofing windows: a window replacement. RELATED: 2.

However, window inserts can be costly: They average about $36 per square foot, says Spina. So, "they are an investment in your space and more common for those planning to be within the space for a ...

Soundproofing windows in your home can help you dampen noise for better sleep, and block out ambient noise in your home office. Window inserts are probably the most effective options, but they are ...