DIY kits delivered anywhere in Newcastle, Lake Macquarie & Port Stephens
Single door from $330 | Double door from $660
Professional installation via our authorised distributors
Newcastle | Lake Macquarie | Maitland | and more
Est. 2012
Australia's Original
Independently Tested
AS/NZS 4859.2:2018
Australian Made
Licence 7177
Composite Technology
Purpose Built for Garage Doors
Verified R1.43 – independently tested by a qualified thermal engineer. Full test report available to view
Newcastle summers are relentless. Afternoon temperatures regularly push past 35°C, and with the westerly winds driving heat through steel garage doors, an uninsulated garage becomes unusable by midday. ThermaDoor's EPS core and reflective foil backing work together to block radiant heat and keep your garage usable all summer long.
Newcastle's coastal suburbs face a double challenge: summer heat combined with 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. Built to handle Newcastle's coastal conditions.
Newcastle winters are mild by inland standards, but overnight temperatures still drop sharply — particularly in the western suburbs. 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.
ThermaDoor gives builders, homeowners and energy assessors verified garage-door assembly R-values, backed by an independent engineering report, to review when the garage affects comfort, heat transfer or adjoining living areas — whether for a new build, renovation or existing home. Ask any supplier for their engineering report.
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.
Are you a builder, architect, or energy assessor? View our Trade & Industry Hub for full NatHERS and NCC compliance data.
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.
Want to insulate your Newcastle 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 Newcastle, Lake Macquarie, Port Stephens or anywhere across the Greater Newcastle region? 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.
The prices below are a guide only. For your exact price including freight to your door, grab a tape measure and use our shop — it takes two minutes, no account needed, and you’ll know exactly what you’re up for before you commit to a thing.
| Door Size | Panels | Price (from) |
|---|---|---|
| Single Door | 8 panels | From $330 |
| Single Door (Large) | 10 panels | From $380 |
| Double Door | 16 panels | From $660 |
| Double Door (Large) | 20 panels | From $760 |
* Prices include GST. Freight not included — calculated at checkout based on your postcode. No obligation to buy.
Most DIYers grab a tape measure and have their exact price in just a couple of minutes
Not ready to measure up just yet? Fill in our enquiry form — allow a few days during busy periods.
WE DO IT FOR YOU
Rather let us insulate your garage for you? ThermaDoor is supplied and installed by authorised distributors across Newcastle. Find your nearest distributor below.
Black Hill
Coast to Valley Garage Doors
6/12 Viney Creek Drive, Black Hill NSW 2322
📞 (02) 4955 3332ThermaDoor provides garage door insulation across Newcastle, with nearby NSW service areas including the Hunter Valley, Central Coast, and Sydney. You can also view all NSW locations on our New South Wales garage door insulation page.
Looking for other areas? See our list of professional distributors Australia wide.
Use the calculator below to estimate the possible payback and long-term value of insulating a suitable Sydney garage door with ThermaDoor.
These estimates apply to ThermaDoor only and cannot be assumed for other products used as garage door insulation.
Your climate affects how much thermal load your garage door creates and how much insulation can help.
Larger doors have more surface area, so insulation has a greater impact on thermal load.
These factors determine how much the garage door's thermal performance affects your living spaces and energy use.
Your electricity rate
Your results are ready
Based on your inputs
Thermal performance — before & after
Without ThermaDoor
R0.0
Uninsulated steel door
No thermal resistance
ThermaDoor
R1.43
Winter assembly R-value
R1.39 summer
AS/NZS 4859.1 & 4859.2:2018
What ThermaDoor does for your door
Estimated annual energy saving
$250 – $450
Typical estimate · per year
Kit cost (DIY)
—
Typical payback
—
10-yr return
—
Calculated for ThermaDoor only — Australia's original purpose-made, independently tested garage door insulation
Conservative
$120 – $250
per year
Typical
$250 – $450
per year
High Usage
$450 – $700+
per year
Return on investment — based on your DIY kit price
| Scenario | Annual saving | Payback | 10-yr saving |
|---|
Kit from $330 inc. GST. Freight additional — calculated at checkout.
Your inputs
Peter Harding shares his experience with ThermaDoor garage door insulation after having it installed three times over 12 years.
Real results for real Newcastle 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, Newcastle 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. As the primary insulator in the composite system, it works in tandem with the foil and air cavity to deliver the verified assembly R-value.
Laminated to the back of every panel, this construction-grade foil reflects radiant heat back across the internal air cavity — the gap maintained by ThermaDoor's purpose-made foam packers. The foil only works because the gap is engineered. Together they form the reflective half of ThermaDoor's composite technology. The foil also acts as a Class 2 vapour barrier and achieves Group 1 fire performance classification — it's the same foil used to wrap Australian homes.
The composite system only performs if the materials stay intact. This durable, flame retardant, UV-resistant vinyl facing protects the EPS core and lamination bond from Australia's harsh climate — resisting fading, cracking, and weathering year after year. The result is a clean, professional finish that holds its appearance and structural integrity for the life of the door.
Newcastle, Merewether, Belmont, Warners Bay, Charlestown, Morisset, Gateshead, Barnsley, Cardiff, Swansea, Wallsend, Toronto, Kotara, Hamilton, Mayfield, Jesmond, Beresfield.
Raymond Terrace, Medowie, Salamander Bay, Nelson Bay, Anna Bay, Williamtown, Tomago, Thornton.
DIY kits ship to all Newcastle postcodes.
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 — and Newcastle’s combination of summer heat and coastal humidity makes it one of the most effective upgrades you can do. An uninsulated steel garage door absorbs and radiates heat directly into your garage, pushing temperatures well above the outside air temperature on a hot afternoon. ThermaDoor’s EPS core and reflective foil backing significantly reduce that heat transfer, keeping your garage cooler in summer and warmer on cold winter mornings.
Both options are available. ThermaDoor DIY kits are designed for straightforward self-installation — no trades required, and most homeowners complete the job in a few hours. If you would prefer a professional result, our authorised distributors in Newcastle, Lake Macquarie, and Port Stephens offer supply and installation.
DIY kits start from $290 for a standard single door (8 panels), up to $680 for a large double door (20 panels). Freight is calculated at checkout based on your postcode. For professional installation, contact one of our Newcastle distributors for a quote — pricing varies depending on door size and access.
ThermaDoor panels are designed to fit the vast majority of sectional and tilt garage doors in Australia. Panels are cut to your door’s exact dimensions. If you are unsure, send us a photo of your door and we will confirm compatibility before you order.
Yes. The EPS core and vinyl facing significantly dampen street noise and the sound of the door operating. This is particularly noticeable in garages that share a wall with a living area or bedroom — a common layout in Newcastle’s established suburbs.
For most Newcastle homeowners, yes. If your garage faces west or north and gets direct afternoon sun, the temperature difference with ThermaDoor installed is significant. Customers report reductions of up to 20°C in garage temperature. For garages used as workshops, gyms, or living extensions — or for homes where the garage shares a wall with a living area — the improvement in comfort and energy efficiency is substantial.
Use the distributor finder above to locate your nearest authorised installer. ThermaDoor is supplied and installed by Coast to Valley Garage Doors (Barnsley), Macquarie Garage Doors (Gateshead), and Newcastle Garage Door Service (Beresfield) — covering Newcastle, Lake Macquarie, Port Stephens, and surrounding areas.
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 or send an enquiry below to see if we have an installer in your area.
