New Look.

Same expertise, craft and warmth.

The double glazing specialists.

Experience the expertise, craft and warmth of Thermoglaz.

We are your local double glazing specialists and one stop shop to all your retrofit and new double glazing needs.

Retrofit Timber Frames

Retrofit Timber Frames

A pioneering, reliable and simple process of removing your existing single glazed panes from your timber windows, then installing new high performance thermally insulated double-glazed glass into your existing frames.

Retrofit Aluminum Frames

Retrofit Aluminum Frames

We can install Thermoglazed units into any existing aluminium frame of any size or shape, and with any finish. We provide you the most professional and reliable system available on the market we guarantee it stands the test of time.

New Windows & Doors

New Windows & Doors

Our skilled team at Thermoglaz can help with whatever your plans for windows and doors, allowing your major investment to keep your family warm and healthy through many more winters to come.

Book a FREE Quote

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Why choose Thermoglaz?

  • NWe deliver exactly what we promise
  • NWe don't cut corners
  • NWe guarantee your double glazing stands the test of time
Give us a call

“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