DIY kits delivered anywhere in the Southern Highlands
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.
The Southern Highlands has its own set of garage comfort challenges, from cold winter mornings in Bowral, Mittagong and Moss Vale to hot summer afternoons across Berrima, Bundanoon and Robertson. In many homes, the garage sits directly beside internal living areas, bedrooms, workshops or storage spaces, so an uninsulated garage door can let heat build quickly in summer and allow cold air to push in through winter. Whether you use your garage as a workshop, gym, home office, storage area or simply to park the car, the temperature inside that space can affect comfort, usability and energy performance throughout the home. If you have been searching for garage door insulation that genuinely works, ThermaDoor delivers tested, purpose-built results.
ThermaDoor is designed and manufactured in Queensland, with our factory at Chevallum on the Sunshine Coast. When you order a ThermaDoor kit to the Southern Highlands, you are buying Australian made insulation from a business that has engineered its product specifically for the Australian climate.
From Bowral and Mittagong to Moss Vale, Berrima, Bundanoon and Robertson, Southern Highlands garages can get noticeably cold through winter, especially overnight and early in the morning. An uninsulated garage door allows cold air to push into the garage and can make adjoining rooms, workshops and storage areas less comfortable. ThermaDoor helps slow heat loss and improve garage comfort, so the space feels more usable throughout the colder months.
While the Southern Highlands is known for its cooler climate, summer heat can still build quickly inside garages, especially when the door faces afternoon sun. A bare metal garage door absorbs and radiates heat into the space, making workshops, gyms, storage areas and home offices uncomfortable. ThermaDoor dramatically reduces radiant heat transfer, helping keep your garage more stable through warmer weather.
Many Southern Highlands homes use the garage for more than parking. Whether it is a workshop, home gym, hobby space, storage area or internal access point, temperature swings can affect how comfortable and practical the space feels. ThermaDoor’s purpose-built EPS insulation panels are designed specifically for sectional and tilt garage doors, helping to reduce heat transfer, improve appearance and create a cleaner, more finished garage interior.
NSW’s NCC 7-star energy requirements now apply to all new homes and major renovations. An uninsulated garage door performs at approximately R0.0, making it one of the largest thermal weak points in many homes. ThermaDoor is the only garage door insulation in Australia with independently calculated assembly R-values to AS/NZS 4859.2:2018. When your builder or energy assessor asks about garage door insulation, ask for ThermaDoor by name.
Read more about why winter is one of the strongest arguments for garage door insulation →
For Deborah’s son, an NDIS participant, the garage is “The Cave” — a vital space for his independence and his support team. They had already invested in an epoxy floor and replastering to create something special. But the heat made it almost unusable.
28°C
OUTSIDE AIR TEMPERATURE
44.7°C
DOOR SURFACE TEMPERATURE
30.8°C
DOOR SURFACE WITH THERMADOOR INSTALLED
Australia’s original purpose-built garage door insulation — independently tested, made to fit, built to last.
Surface temperature readings: 37.6°C at the steel hinge (thermal bridge) / 32.6°C at the ThermaDoor panel
What you are seeing: The blue areas show ThermaDoor panels doing their job — blocking radiant heat. The red and orange areas are the steel hinges and panel joins conducting heat straight through the door. This is thermal bridging, and it happens in every sectional garage door. It is why material R-values alone do not tell the full story — and why ThermaDoor’s R-values are calculated on the complete installed door assembly, steel and all.
Our article on thermal bridging and garage doors explains why tested assembly values matter.
In the Southern Highlands the difference between a material R-value and a tested door assembly R-value is the difference between a product that looks good on paper and one that actually keeps your garage cooler. ThermaDoor’s R1.43 is tested on a complete installed door — steel, hinges, and all.
Are you a builder, architect, or energy assessor? View our Trade & Industry Hub for full NatHERS and NCC 2022 compliance data.
Want to insulate your Southern Highlands 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 Bowral, Mittagong, Moss Vale, Berrima, Bundanoon, Robertson or anywhere across the Southern Highlands? ThermaDoor DIY kits ship direct to your door. Each kit is purpose-built for sectional and tilt garage 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.
These are indicative prices only. For your exact price including freight, take a few measurements and use the shop — no account required. Prefer to send us your door details? We’ll send you a DIY quote within a few days.
| Door Size | Panels | Price (from) |
|---|---|---|
| Single Door | 8 panels | From $290 |
| Single Door (Large) | 10 panels | From $340 |
| Double Door | 16 panels | From $580 |
| Double Door (Large) | 20 panels | From $680 |
* Prices include GST. Freight not included — calculated at checkout based on your postcode. No obligation to buy.
WE DO IT FOR YOU
Rather let us insulate your garage for you? ThermaDoor is supplied and installed by authorised distributors in the the Southern Highlands. Find your nearest distributor below.
Southern Highlands
Locked Up Garage Doors
Southern Highlands garage door installation and servicing enquiries
ThermaDoor services the Southern Highlands, with nearby NSW garage door insulation areas including Sydney, Wollongong and the Illawarra and the South Coast and Shoalhaven. For the full state-wide service overview, visit our New South Wales garage door insulation page.
Looking for other areas? See our list of professional distributors Australia wide.
Peter Harding shares his experience with ThermaDoor garage door insulation after having it installed three times over 12 years.
Real results for real Southern Highlands homeowners
I had my west facing garage door insulated and sealing brushes added to stop dust, some of the best money I have ever spent on a house improvement. Great service, efficient and reasonably priced. I would recommend in a flash.
We’re super impressed with our newly-installed Thermadoor insulation, it works a treat on our north-facing garage door and looks very sharp. Top marks for customer service and Caleb’s very neat and tidy job on the install. Highly recommend this outfit
This is a great product and service. Installed them myself and they work amazingly well. Great price compared to other companies who quoted me and Peter was super helpful in getting the sizing just right. Thoroughly recommend this product and company.
Australia’s original purpose-built garage door insulation — independently tested, made to fit, built to last.
With a stable, comfortable temperature year-round, Southern Highlands 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:
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.
Bowral, Mittagong, Moss Vale, Burradoo, East Bowral, Welby, Braemar, Renwick, Colo Vale, Hill Top, Alpine, Aylmerton, Yerrinbool.
Berrima, New Berrima, Bundanoon, Robertson, Exeter, Sutton Forest, Burrawang, Avoca, Kangaloon, Glenquarry, Wildes Meadow, Fitzroy Falls, Penrose, Wingello.
DIY kits ship to all Wollongong and Illawarra postcodes.
View all New South Wales regions
Australia’s original purpose-built garage door insulation — independently tested, made to fit, built to last.
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.
Yes. ThermaDoor DIY garage door insulation kits are designed for homeowners who want to insulate their own sectional or tilt garage door without needing a trade. Kits can be delivered to homes across the Southern Highlands, including Bowral, Mittagong, Moss Vale, Berrima, Bundanoon and Robertson. Each kit is made for garage doors and includes the materials needed to complete the installation yourself.
Yes. Southern Highlands homes often experience cold winter mornings, cool overnight temperatures and warm summer afternoons, especially where the garage door faces direct sun. A DIY ThermaDoor kit helps reduce heat transfer through the garage door, making the garage more comfortable and practical for parking, storage, workshops, home gyms and internal access areas.
ThermaDoor DIY kits are suitable for most sectional garage doors and many tilt garage doors. The insulation panels are purpose-built for garage doors, rather than being general building foam or hardware-store insulation adapted for the job. If you are unsure whether your door is suitable, check the door style, panel layout and available clearance before ordering.
Most homeowners can install a ThermaDoor DIY kit in a few hours, depending on the size and style of the garage door. A single garage door is usually quicker, while a double sectional door may take longer because there are more panels to measure, cut and fit. No specialist trade is normally required.
Yes. In cooler Southern Highlands areas such as Bowral, Mittagong and Moss Vale, an uninsulated metal garage door can allow cold air and radiant temperature loss to affect the garage. Insulating the door helps slow heat transfer, reducing the sharp temperature swings that make garages uncomfortable during winter mornings and evenings.
Yes. Even though the Southern Highlands is known for cooler winters, summer sun can still heat a steel garage door very quickly. A west-facing or north-facing garage door can radiate heat into the garage for hours. ThermaDoor insulation helps reduce radiant heat transfer, making the garage more usable during hot afternoons.
Garage door insulation can make these spaces more comfortable, especially when the garage is used as a workshop, gym, hobby area, storage room or home office. It will not turn a garage into a fully conditioned room by itself, but it can significantly reduce one of the largest sources of heat gain and heat loss: the garage door.
Yes. ThermaDoor DIY garage door insulation kits can be delivered throughout the Southern Highlands, including Berrima, Bundanoon, Robertson and surrounding villages. If your property is outside the main towns, delivery may still be available to your postcode.
Professional installation may be available through authorised garage door specialists in the Southern Highlands region. If you prefer not to install the kit yourself, you can enquire about local installation options for Bowral, Mittagong, Moss Vale and nearby areas.
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.
