DIY kits delivered anywhere in Sydney South
Professional installation via our authorised distributors.
Australia's Original
AS/NZS 4859.2:2018
Licence 7177
For Garage Door Systems
Building to 7 stars? ThermaDoor is the only garage door insulation with the engineering documentation your energy assessor needs.
ThermaDoor is designed and manufactured in Queensland, with our factory at Chevallum on the Sunshine Coast. When you order ThermaDoor for your Sydney South garage, you are buying Australian made insulation from a business that has engineered its product specifically for the Australian climate.
From the humid coastal suburbs of Cronulla and Sans Souci to the hotter inland pockets of Sutherland and Hurstville, ThermaDoor dramatically reduces radiant heat transfer, keeping your garage significantly cooler in summer.
Sydney's southern coastal fringe faces a double challenge: intense summer heat combined with coastal humidity and salt-laden air year-round. ThermaDoor's laminated vinyl finish is water resistant and impact resistant, unlike open-cell foam or polyester batts that absorb moisture and deteriorate over time.
Even in Sydney's mild winters, overnight temperatures in the Sutherland Shire and southern suburbs can drop sharply. ThermaDoor slows heat loss overnight, so stepping into your garage on a winter morning is no longer a shock — and your stored gear, tools, and vehicles stay protected from the cold year-round.
With a stable, comfortable temperature year-round, Sydney South’s homeowners are reclaiming their garages as usable living spaces.
Here is how ThermaDoor changes what you can do with your garage.
Train comfortably year-round — no more sweltering summers or chilly winters.
Quieter, more stable temperatures for better focus and lower energy bills.
A retreat that stays cool in summer and warm in winter for real downtime.
Consistent conditions that protect materials and make projects more enjoyable.
A safer, more comfortable space for children’s play – fewer drafts and hot/cold spots.
A calmer climate for pets, reducing heat stress in summer and chills in winter.
ThermaDoor has been on the Australian market since 2012 — and in that time, no other brand has matched what we offer:
Our article on thermal bridging and garage doors explains why tested assembly values matter.
Are you a builder, architect, or energy assessor? View our Trade & Industry Hub for full NatHERS and NCC 2022 compliance data.
Flame retardant, construction-grade expanded polystyrene foam is the primary insulator in every ThermaDoor panel. It slows conducted heat transfer through the door — keeping your garage significantly cooler in summer and warmer in winter, year after year.
Durable, flame retardant, UV-resistant vinyl facing protects the panel from Australia's harsh climate. It resists fading, cracking, and weathering — delivering a clean, professional finish that holds its appearance and structural integrity for the life of the door.
Bonded to the back of every panel, this construction-grade foil reflects radiant heat, acts as a Class 2 vapour barrier, and achieves Group 1 fire performance classification. It's the same foil used to wrap Australian homes — completing the three-layer system.
Registered Australian Design. Protected under the Designs Act 2003 (Cth). Unauthorised reproduction prohibited.
Want to insulate your Sydney South garage door? You have two options — insulate your own garage with our DIY kit, or let us insulate your garage through an authorised local distributor. Same product, same quality, same result.
DO IT YOURSELF
Want to insulate your own garage in Cronulla, Sutherland, Hurstville, Miranda or anywhere across Sydney South and the Sutherland Shire? ThermaDoor DIY kits ship direct to your door. Each kit is purpose-built for sectional and tilt doors and comes with everything you need to complete the job yourself in a few hours. No trades required.
Not sure if garage door insulation is right for you? Read why garage door insulation is worth it in Australia.
Answer 4 quick questions — we'll tell you exactly which kit fits your door and what it costs.
Your door brand determines the panel thickness required.
What is your panel thickness?
Count the individual panel sections across the full width of your door.
Measure every panel, then enter the largest measurement below.
⚠ Measure every panel before entering anything
Panels on the same door are often different sizes. If you only measure one panel and it turns out not to be the largest, your kit will be too small. Measure all panels first, then enter the longest length and largest height below.
Your price is ready
Based on your measurement
Kit price
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Order details
ThermaDoor panels are trimmed to fit. Always cut panels to size during installation — never force an oversized panel.
Before you order — confirm your shop selections
The shop dropdown defaults to a random size. Tick each item below to confirm you have changed it to the correct value.
WE DO IT FOR YOU
Rather let us insulate your garage for you? ThermaDoor is supplied and installed by authorised distributors across Sydney South. Find your nearest distributor below.
Looking for other areas? See our list of professional distributors Australia wide.
Cronulla, Caringbah, Miranda, Sutherland, Gymea, Engadine, Menai, Barden Ridge, Illawong, Kirrawee, Sylvania, Jannali, Oyster Bay, Woronora.
Hurstville, Kogarah, Rockdale, Sans Souci, Brighton-Le-Sands, Bexley, Carlton, Peakhurst, Penshurst, Oatley, Lugarno, Bankstown, Revesby, Padstow.
Campbelltown, Narellan, Camden, Ingleburn, Minto, Leumeah, Macquarie Fields, Glenfield, Eagle Vale, Raby, Bow Bowing.
DIY kits ship to all Sydney South postcodes.
BEFORE YOU BUY
Most garage door insulation products are marketed using terminology borrowed from walls and ceilings. This free checklist gives you the five questions that cut through the noise — and that most suppliers cannot answer.
See why over 20,000 Australian homeowners choose the only purpose-built garage door insulation made in Australia.
⭐⭐⭐⭐⭐
Karen and the crew were fantastic to deal with from start to finish. The product is amazing and has decreased the temperature in our garage by 10–15 degrees C and also decreased the temp in our house. It was super easy to self install. Massive thumbs up!”
⭐⭐⭐⭐⭐
“Our garage was very hot and a suggestion from a friend meant that we contact ThermaDoor. From the initial contact to the completion, the company was very professional. The product is very good and I would definitely get their team to install. Today Don arrived on time and got the job done very quickly. The addition of the door seals was a good decision as they remove any dust and breeze that used to come through the sides and top.”
⭐⭐⭐⭐⭐
“Garage temps have dropped 4–6°C since installation and so glad we installed the ThermaDoor panels. We built a new house in 2023/2024 and the garage door gets full western sun every afternoon. I made sure to take note of our garage temps before installation and noticed immediately after installation the temp dropped 4–6°C in summer and in winter it’s not as cold. I also noticed the noise is reduced.”
⭐⭐⭐⭐⭐
“Everything about ThermaDoor was fantastic. Easy online ordering, fast interstate delivery and DIY installation was straightforward and a breeze. I would recommend the business and the product.”
Ready to transform your garage?
Yes. In Sydney South, an uninsulated steel garage door offers virtually no thermal resistance — approximately R0.0. During a 35°C summer day, the door acts as a massive radiator, heating the garage and any adjoining rooms. ThermaDoor panels block up to 90% of this radiant heat, significantly reducing the temperature inside the garage.
ThermaDoor achieves independently tested assembly R-values of R1.43 (winter) and R1.39 (summer). These are complete door assembly values calculated by a qualified thermal engineer to AS/NZS 4859.1 and 4859.2:2018, ensuring alignment with NatHERS and NCC 7-star energy efficiency requirements.
Both options are available in Sydney South. Our DIY kits are designed for straightforward installation on standard panel-lift and tilt doors with no special tools required. If you prefer a professional finish, our authorised local distributor PT Doors, based in Menai, can supply and install the system for you.
ThermaDoor is constructed with a high-density EPS core and a Class 2 vapour barrier (Sisalation foil backing). Unlike open-cell foam or batts, it does not absorb moisture. The impact-resistant vinyl facing is also easy to wipe clean, making it ideal for coastal suburbs across the Sutherland Shire and St George area.
Yes. ThermaDoor was invented by an Australian builder and is proudly manufactured in Australia. It is the original purpose-built garage door insulation system on the market, designed specifically for Australian conditions.
Need more details? See our full Garage Door Insulation FAQs for compliance, R-values and warranty.
Below is our step by step video guide on how to insulate your garage door with ThermaDoor Garage Door Insulation – Australia’s ONLY PURPOSE MADE garage door insulation!
Call, text, or send an enquiry below to see if we have an installer in your area.
