Retrofit Double Glazing Melbourne

Thermawoods Master Franchise for Victoria is based in Melbourne with Franchises throughout the State. Double glazing existing wooden windows and doors in Melbourne and Victoria has never been as easy, affordable and effective as right now.

Fit Thermawood retrofit double glazing and draught seals.

Energy efficient, retain character and reduce noise.

Thermawoods unique retrofit double glazing system is a patented dry glazing solution that is only available through Thermawood franchises. With the ability to customise a double glazing solution for each individual timber window in your home without having to rip out those beautiful timber window frames. You can now retain 100% of the character of your home while enjoying all of the benefits of new double glazed windows at a fraction of the cost.

For all general enquiries in Victoria contact:

JACKI COOK (VIC Master Franchise)

Phone: 04 069 45 734


Address: 77 Lloyd Street, Heidelberg Heights, Melbourne VIC 3081


Victoria’s property landscape is made up of a large range of architectural styles featuring beautiful wooden windows. Victorian Terrace Homes with classic double hung timber windows predominantly constructed in the 1860 to 1880 era right through the decades to modern times.

  • Victorian (1860 -1880)
  • Italianate (1870 – 1890)
  • Boom Style (1875 -1890)
  • Federation/Queen Anne (1895 -1915)
  • Edwardian (1900 -1915)
  • Californian Bungalow (1920’s)
  • Art Deco (1930’s)
  • Double and triple fronted brick veneer (1960 – 1980)

It is with all of these beautifully constructed homes that the strong demand for a double glazing solution that revolves not only around sustainability and longevity but maintaining aesthetics, heritage and the original functionality. With Thermawood now the likes of double hung windows can operate as they were when brand new and last for many decades more.

We service the state of Victoria with the most advanced double glazing system for existing timber windows.

Follow Me

retrofit double glazing


Melbourne Retrofit Double Glazing Testimonials


David Issko

An amazingly effective product professionally installed by Jacki and Hawea. The window is next to a new & massive 23Kw heat pump compressor. Noise levels have been cut down considerably with 6.38 Lam, 10mm argon and 4 mm float in place of 3mm float. Jacki and Hawea also installed very effective acoustic seals around the awning window. They stayed and fine-tuned acoustic seals until I was 100% satisfied with the job. Jacki took my vacuum cleaner and ensured the room was as clean as when she first arrived. I highly recommend Thermawood double glazed retrofit glass company.

James Hains

Mark was fantastic. Clear communications and reliable. Windows are great, slotting into the sash windows at my Victorian terrace and really lowering outside noise and keeping the house warmer. Mark also did an excellent repair on a window frame that had rotted and at a price that was very reasonable (I’m sure I could not have got someone to even turn up for what Mark charged). The house was also left spotless. A great experience and product.

Tim Muir

We’re really pleased with our windows, particularly the replaced lead lighting. Jacki and Hawea were great to deal with and I would recommend Thermawood if you’re looking to improve your home’s efficiency.

Alan Bailey

Very nice people to deal with. Knowledgeable about their product, hardworking and efficient, and come when they say they will. I would recommend the Thermawood product and Jacki Cook of Thermawood Boroondara to anyone considering retrofitting double glazing to existing timber windows.

Cliff Dodd

I was highly fortunate in coming across Thermawood – Mark Goodwin & Crew. The application was fitting double glazing to 2 × arch double hung windows’ in a heritage home. Mark at the start, consulted on the details, providing a quote for the complete fitting in a highly professional manner – which was my experience carried right through to finished job. During the work – the care is taken for keeping the area tidy, and concern for preventing damage inside & outside the premises was meticulous and impressive. The objective of the double-glazing retro-fit was to reduce traffic noise from a busy intersection and improve insulation. Living the result, I can strongly say; of being very delighted with the performance – it is very good, giving a highly notable response, to both noise & internal house insulation qualities. On a personal level, “The Crew”, were a pleasure to experience. The care to the high quality of workmanship clearly shows, and it is my intention here, to convey my huge enthusiasm for this whole project, headed by Mark. If it was possible, I would like to go 5 stars + +

Garun Hamilton

Mark from Thermawood was fantastic. He is hard working, careful with your house and cleans up diligently after the day. We are very happy with both the product and the quality of service provided.


I have been looking for an affordable and high-quality double glazing system for over 5 years. Each time I asked for quotations I was disappointed with the technology to let alone the huge cost. It never made sense to me to replace perfectly fine existing window frames as this is very labour intensive and costly. When I learned about the technology used by Thermawood I thought that this made perfect sense to me. They replace the glass component of the existing window rather than the window frame + window itself. This technology has been successfully used in New Zealand for 40+ years. It allows homeowners to provide better insulation from heat/cold/noise as well as reduces the chance of wood rotting, draft etc. and it is also VERY cost effective. Mark and his team are very professional, arrive on time, get things done and do not leave any mess behind them. They are friendly to owners as well as neighbours, work hard to get a job done in the shortest possible time. I can recommend Mark and Thermawood to anyone who is looking for a system that reduces heating/cooling bills at a very affordable price.

Carolyn Nguyen

Our 1960s timber windows had double-glazing retrofitted by Thermawood. Very happy with the appearance and performance of the product. While the appearance hasn’t changed noticeably (the look of the timber frames and the low e film on the glass), the thermal performance has improved significantly. Thermawood was also able to change our winders and weather-seals for an additional fee. Jacki was fantastic with communicating to us during the entire process (from pre-quotation to post-install). Very happy, will definitely get some more windows done.

David Findlay

Mark and his team were very efficient and installed a great product. We were very impressed with the way that they worked, cleaning up at the end of each day and ensuring a tidy work site. The Thermawood system is the only one that I found which cleanly integrates proper IGU double-glazing units into existing wooden windows. Ours is a combination of fixed and awning sash windows, and also one sliding window, one sliding door and one regular glass door were done. All of them look great!

Patrick Gan

It was a pleasure working with Jacki and the Thermawood team. Fantastic products and double glazing solutions. Our heritage windows have a new lease on life! Thank you!

Edmund Crampin

Thermawood retrofit double glazing to two wooden-framed windows at our home. We are delighted with the outcome. The windows look absolutely great, the two rooms are noticeably quieter and much much cosier than before. The two windows were challenging (one is a box window, both turned out to be very finicky) and Jacki and team went to great efforts to make sure that we ended up with a really great outcome. Recommend without hesitation.

J Macca

We are extremely happy with the product and work provided by Thermawood. We first saw this product at a home show in Melbourne and after further investigation, felt this was the product for us providing double glazing and security as well as keeping the original look of our house. The product is high quality and performs as stated. Increased insulation and decreased noise were noticed immediately. Mark was the person who quoted, worked and communicated with us. Mark also installed the Thermawood product. Mark was easy to talk to and always got back to us when we had questions no matter how simple they sounded. When installation occurred Mark was careful and ensured the job was completed easily and seamlessly. The completed job looks great. The cleanup was part of the job and no mess left which was an added bonus. Mark is very careful and professional with his work and is easy to have around the house. Security supplied by these window retrofits is greatly appreciated. A very professional company, people and product. I have no hesitation in recommending Thermawood to any person contemplating double glazing existing timber windows. Apart from increasing insulation, the laminated glass increases security as well as decreasing noise. Once again excellent company, product and particularly people.

Lizzy Deitz

Jacki & Hawea provided amazing customer service and it was a pleasure dealing with them. While getting our windows involved a few hiccups, they were mostly to do with our windows being old & bad, not to do with Thermawood. And we love our much quieter house.

Paul Kitchell

I am just so impressed with our new retrofit double glazing from Thermawood. The whole process, from quoting to completion, was seamless and stress-free. What a great team Hawea and Jacki are. Their workmanship was excellent, and they had a great desire to make sure that every detail of the installation was perfect. I will be definitely recommending Thermawood to our friends and family. Thanks a lot, guys.

Conor O’Brien

This is a really good product supported by great service by Jacki who was always prompt and helpful and by the men who installed the glazing. They were polite, clean and professional. As for the outcome I am pleased with double glazing and particularly the seamless integration into a 100-year-old Vic terrace sash window. Highly recommended.

Jeff Steven

We have just had several largish window areas retrofitted with double glazing by Thermawood. We are extremely happy with the result, a great looking result and are feeling the benefits straight away. We needed a doggy door installed in one and the advice and result were fantastic. Jacki, Hawea and James were a delight to deal with. Any questions were answered promptly and they always turned up on time and left the house in a clean state. Great product and great customer service, highly recommended.

Patricia Buoncristiani

We have been delighted with every step of the process and with the final product. Installers arrived on time, were a pleasure to have around and cleaned up after themselves. We had around 38 windows replaced so it was a big job carried out with almost no disruption to our daily routines. The finished windows look great and we are enjoying the thermal benefits already. It can get pretty cold in the Dandenongs but last night we barely used the heater at all and haven’t needed to light the fire for several days. Thank you, Jacki and your crew. We will be back for more next year.

Adrian Ong

Thanks to the new windows, we can sleep much better now as we can barely hear the noisy cars outside anymore!
Also, the bedrooms feel warmer in winter, and cooler in summer due to the great insulation properties of the new glass. Thank you to Jacki and her team. They were very professional and provided top-notch service. Would highly recommend!

Nan McCallum

My new Thermawood windows in my heritage house are terrific and have made my house much more comfortable thermally and acoustically. The double glazed units fit discreetly in the window frames without impacting the heritage look. The old window mechanisms have been updated and all work well now. The Thermawood staff were delightful, prompt and the highly experienced technicians worked hard and very conscientiously with a great old fashioned, caring customer service attitude. I was highly impressed and recommend them confidently.

Robyn Parker

A great experience from start to finish with excellent follow-up and attention to detail.

Dianne Mitchell

Well organised job. The second floor so needed extra effort for access. Noise from the main road reduced. Flat now snug for winter. Would recommend.

Daniella Morales

I would highly recommend Thermawood. They were reliable and communicated everything clearly. The new windows are excellent!

Paul Tyndale

Really effective system – efficiently installed and friendly team.

Ron Hemmink

Excellent service performed in an extremely professional manner. Happy to recommend to anyone!