Retrofit Double Glazing Sydney

Thermawoods Master Franchise for New South Wales is based in Sydney with Franchises throughout the State. Double glazing existing wooden windows and doors in Sydney and NSW 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 NSW contact:

PIETRO COTINO (NSW Master Franchise)

Phone:  04 883 00 150


Address: 128 Claudare Street, Collaroy Plateau, Sydney NSW 2097


The New South Wales 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 New South Wales with the most advanced double glazing system for existing timber windows.

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Sydney Retrofit Double Glazing Testimonials


Pip McKay

Pietro’s service is really wonderful he makes sure he delivers on his promises and goes the extra mile to make sure everything is perfect. The double glazing works a treat and has really reduced noise in our front rooms that face a busy road. It is so much easier to work and sleep in those rooms now and they look exactly like the beautiful original windows because they are the original window frames with clever double glazing. It is also excellent value for money!

Robert Ericsson

Thanks so much to Pietro and the guys from Thermawood for double glazing our old existing timber sash windows. They were very tricky to do, but the end results were better than we expected. Pietro was great at explaining all the options and helping us with the choices we made. A few small issues were felt with quickly and without any problems. If anyone has old sash window that they would like to improve the performance of but don’t want to replace, I would highly recommend these guys.

Sally Flannery

We highly recommend Pietro from Thermawood in Sydney. Pietro and his team refitted a number of windows with acoustic treatment to reduce road noise whilst maintaining heritage look of the windows. The work was done on time and to a very high standard. Attention to detail was excellent and we are very happy with the end result. Thanks Pietro!

Deborah Biancotti

Pietro & the team went above & beyond to provide a product that met my needs & fitted my old house. Could not recommend them or the Thermawood products more highly.

Kerrie O’Grady

We dealt with Pietro from Northern Beaches branch. Once we got initial mix up sorted out things went well. The quote was provided and then when he came to do final measure we discussed possible changes which were agreed to after site visit. The windows on the southern side of the house were fitted in one very long day at the beginning of Sept 2018. We are very pleased with the result and finish. The staff who did the fit out were polite and cleaned up after the work was completed which was lovely. We could notice a marked change in temperature within the rooms almost immediately and the noise has reduced a fair bit. I think we should have possibly gone for next level up just for additional noise reducing benefits, as it was we went for double glaze with laminate. We look forward to seeing how they perform when summer arrives and are seriously considering getting all the windows on the northern side of the house done too. We would HIGHLY recommend them to anyone who is considering retrofitting timber windows with double glazed.

Jane Tyler

Great product and service, very happy with Pietro & his team.

Darren Page

Extremely pleased with the Thermawood team, led by Pietro. Very professional, excellent workmanship, quality product and very thorough. This was a tricky job and the final result is fantastic!

Samantha McLean

Pietro and his team have a great product and fantastic customer service. They are responsive and tidy and do all they can to meet your needs. We wanted to make our old 1970s home as warm and efficient as we could and retrofit double glazing with Thermawood has made all the difference.

Naomi Mehan

A pleasure to deal with Pietro and Graeme from Thermawood. A professional, problem solving, friendly team. I love my new windows and would recommend Thermawood to anyone wanting to upgrade their windows.

Karin Sandyford

Pietro and his team were very reliable, considerate and cleaned up afterwards. They delivered what they promised in their quote. They were friendly to deal with and accommodating to changes.

Darrell Martens

Installed 24 panes of double-glazing & 6 flyscreens with winder mechanisms, mainly for thermal performance. Went for the Argon in all units and EV coating in all but north-facing windows, which are being combined with an awning to let the sun in the colder months but out in summer. Pietro & his tradesman were a pleasure to deal with & did a great job – it’s old school labour-intensive craftsmanship leaving you with well sealed, smooth operating windows & doors. We’ve also installed a new R/C air-con & it’s able to run on a pretty light cycle with the improved thermal performance of the room. Sound insulation has also been noticeably improved.

Clare Grant

Can’t recommend the work of this company highly enough. Well thought out plan beautifully executed with care, focus and precision. The new windows have changed the way I live in my house for the (much) better.

Owen Kemp

Passion and patience for the product. Great outcome for the sound reduction and thermal efficiency in a very hot summer.