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Fantastic Frame™ Soundproof Window Inserts

Make any window a soundproof window. Fantastic Frame soundproof window inserts can be custom fit to any window to reduce exterior noise by 10+ dB.

This product ships in 4-6 weeks.

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Number of windows

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
  • Glass: 1/4" acrylic
  • Colors: White, Brown (Custom available)
  • Mounting: Options to fit almost any window
  • Fill out the 
 Spec Sheet   Fantastic Frame Product Sheet 
 Sizing Guide    Fantastic Frame Window Insert Sizing Guide 
 Architect CSI Spec 

 Fantastic Frame Window Insert CSI Spec 

 Install Guide   Fantastic Frame Window Insert Install Guide 
 Tax Credits

 Tax Credit Eligibility Requirements  

 Manufacturer's IRA Certification  


Product Uses

  • Turn any window into a soundproof window. Blocks sound better than any standard window and easy enough for a DIY soundproofing project. Great for street noise reduction in a home
  • 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