A Smart Way To Insulate Your Windows

"I made my chilly home office feel warmer and more comfortable - without replacing the windows or turning my heating up"


★★★★★ Ryan, Birmingham, UK

Check your window size

no commitments. takes 30 seconds

Easy installs in minutes

  • Step 1

    Clean and prepare the window frame.

  • Step 2

    Apply the steel strip

  • Step 3

    Place the magnetic secondary glazing panel onto the frame.

  • Step 4

    Removes anytime. No damage.

1 4

Cold or Draughty Window?

"Doesn't Replace Proper Glazing...But I tested it anyway and the results were clear. Much warmer and more comfortable."

Check your window size

no commitments. takes 30 seconds

Not all window solutions are built the same

CosyPane is designed to balance cost, simplicity, and a clean finish.

Check your window size

  • Perfect Fit Assurance


    We’ll help until your CosyPane fits just right.

  • Free UK Delivery


    Fast, free delivery across the mainland UK.

  • 7-Day Comfort Guarantee


    Feel the difference in 7 days or your money back.

Frequently Asked Questions

Does it really work?


Yes, by trapping a layer of still air, CosyPane reduces heat loss and makes your room feel warmer within minutes.

Will it fit my window?


Each panel is cut to your measurements.

Does it block all noise?

No, but it reduces and softens outside noise, like traffic.

Is it permanent?

No, fully removable. CosyPane is perfect for renters and home owners looking for installations that require no tools or drilling.

How much does it cost?

Check your window size in a few clicks, starting from £109 all in. Free UK mainland delivery.