Double glaze your existing timber windows

Retain the look and feel of your character home while making it warmer, quieter and more comfortable.

A pioneering retrofit double glazing system available for timber windows.

There will be no change to the appearance of your windows from the inside and virtually none from the outside. We fit Thermoglaz units into existing timber windows of any size or shape, including difficult lead lights and feature windows.

  • NRetain your home’s natural character
  • NMore warmth and less draughts
  • NPainless installation process
  • NReduced condensation and dampness
  • NImproved insulation
  • NLower cost energy bills
  • NUV protection for furnishings and interior decor
  • NReduced noise for a quieter home

Book a FREE Quote

15 + 11 =

The Thermoglaz installation process is designed to be totally painless with minimal interruption to you, and with over 30 years experience in the glazing industry, you know you’re in safe hands.

How the Thermoglaz system works

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tatio.

“Fantastic to deal with. Great service from start to finish. Would highly recommend them to anyone. Thanks team.”

Kathryn Fraser

“Thermoglaz was recommended to us for our double glaze refit. We are very pleased we went with the recommendation.
The team at Thermoglaze are the total professionals, no hard sell, great advice, excellent team of installers and the most amazing after install service.”

Bob Cross

“The team at Thermoglaz were are real pleasure to deal with and we are so happy with the results. They did a wonderful job retrofitting our double glazing and I was pleasantly surprised at how little it cost. I would highly recommend them.”


“We recently had our house retrofitted with double glazing into our original wooden frames. What a difference it has made. The team were amazing. All of our windows have colonial bars, they did a fantastic job installing the new bars. Amazing workmanship to keep the look just right.”

John Ross

“Have now had two houses double glazed with Thermoglaz. The service is prompt and friendly. The workmanship is to a high standard and they cleaned up so well you wouldn’t know that had been.. apart from how much difference the double glazing made! Thanks guys!”

Steven Parratt

“Great company to work with. Excellent experience from the sales all the way to delivery. Very friendly, professional and prompt service. Could not fault them.”

Chris Lee

“Love our double glazing. A great company to deal with”

Cathy Hodgins

Get in touch

for a free appraisal.

Visit our showroom

81a Gasson Street Sydenham,
Christchurch 8:00 am to 5:00 pm
Monday to Friday Weekend
by Appointment