Experience the expertise, craft and warmth of Thermoglaz

Your local double glazing experts

Nothing beats a comfortable, cosy home free from condensation and constant noise.

Thermoglaz has pioneered and developed the most professional and reliable retrofit double glazing system available today for timber and aluminium windows.

We also offer top quality, super stylish new windows and doors for both aluminium and timber frames.

We deliver exactly what we promise. We don’t cut corners. We guarantee your double glazing stands the test of time.

Thermoglaz is a proven brand you can trust.

Retro Double Glazing Wooden Windows

Retro fitted double glazing retains the look and feel of your character home providing warmer, quieter and more comfortable living.

Retro Double Glazing Aluminium Windows

Retro fitted aluminium joinery offers you the benefits  of improved warmth, dramatic noise reduction, and substantially less condensation.

Replacement Windows and Doors

Sliding Doors

Replacement and new aluminium windows and doors for residential dwellings whether retro fit of existing windows or for new builds.

General Glazing

Supplying general glazing services including repairs, mirrors, splash backs, fencing, balustrades and commercial services.


  • Thank you for the window up-grade done. Excellent. I was quite taken by the efficient way the staff worked.

    Elgar Dickson
  • Please thank your entire team for such a great job. Really impressed with the expertise, commitment, and enthusiasm everyone has shown. Our old windows fit even better than they did before the double glazing.

    Lizzie & Philip
  • Thank you for a clean, easy fit. It was a pleasure working with such a friendly, professional team.

    Kathy Watson
  • We are thrilled…

    A series of good frosts and snow have been the acid test, and Thermoglaz is a winner for us …

    Great installation with no mess at all.

    Ed & Jean Bickerstaff
  • Not only do we have a much warmer, quieter home, but you’ve retained the original character that was our chief concern from the offset.

    Thanks for walking the extra miles for us and the special challenges our 100 year old property presents – it’s our absolute pleasure to recommend Thermolaz to everyone.

    Carol & Richard Devine
  • What a big improvement in reducing both noise and heat loss. Our home now feels so much warmer. Friendly, efficient and professional – no hesitation in recommending to anyone!

    Jonathan & Deborah Little
The Thermoglaz Shop

Visit Our Showroom

81a Gasson Street
Sydenham, Christchurch

8:00 am to 5:00 pm
Monday to Friday
Weekend by Appointment

The Thermoglaz Showroom

Call for a Free Professional Appraisal

(03) 363 5880