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Fantastic Frame™ Soundproof Window Inserts

This product ships in 4-6 weeks.

Fantastic Frame™ Soundproof Window Inserts



Product Information

  • Custom built window inserts to soundproof any existing window while reducing thermal transfer
  • Durable, discrete window inserts designed for impact resistance and blending into current window frame
  • Reduce sound through your window by up to 80%
  • Increase STC rating of any window by over 10 points
  • Substantially reduce heat loss through window unit (up to 40% energy savings)
  • Fully customizable (shapes, sizes, colors, glazing)
  • Easy to remove and access primary window
  • Proudly made in the USA 


  • Custom made to perfectly fit each window assembly
  • Frame: 7/8" wide x 1" deep
  • Colors: White, Brown (Custom available)
  • Mounting: Options to fit almost any window
  • Fill out the Fantastic Frame Window Insert Sizing Guide

Product Uses

  • Turn any window into a soundproof window. Blocks sound better than any standard window and easy enough for a DIY soundproofing project.
  • If you're looking into how to soundproof a wall cheaply, the windows are the weakest point in most any exterior wall. For interior walls, the best bang for your buck will be to focus on a soundproof interior door.
  • Commercial/retail/office buildings, hotels, condos, home offices, bedrooms, hospitals, doctor's offices, schools, universities, houses of worship, government and municipal buildings


Installation Instructions


Contact us if you have questions!



Sound Transmission Class

 Window Assembly Type 
  Before FF
 Window Inserts 
After FF
 Window Inserts 
 Double Hung Window   24  37
 Triple Casement Window  27 44
 Store Front / Hotel Fixed Window  33

 38 (2.5" air space) 

 46 (4.5" air space) 

 51 (6.5" air space) 










Shipping Cost:
Calculated at Checkout
Project Category:
Material Type:
Soundproof Window