Australia's Original Purpose-Built Garage Door Insulation

A more comfortable garage starts with the door.

SUNNY 28°C AUTUMN AFTERNOON

44.7°C uninsulated | 30.8°C with ThermaDoor installed

13.9°C COOLER DOOR SURFACE

The Standard for Garage Door Thermal Performance in Australia

Engineered composite insulation. Independently verified R-values. Built specifically for the mechanics of your garage door.

Est. 2012

Australia's Original System

Verified R-Values

R1.43 Winter / R1.39 Summer

Australian Made

Licence 7177

Lightweight

About 7kg - Double Door

Composite Technology

Purpose Built for Garage Doors

Product Warranty

Core: life of door · Vinyl & Foil: 7 years

Home

Is Your Garage Making Your Home Uncomfortable?

A bare steel garage door can become one of the largest uninsulated surfaces in your home. In summer, heat from the door can radiate into the garage and adjoining rooms. In winter, the garage can become cold and uncomfortable to use.ThermaDoor adds a purpose-built thermal barrier to the door, helping create a more comfortable garage and reducing the heat load on rooms beside it.

Hot garage in summer

Heat transfers directly into adjoining rooms and living areas

Cold, damp garage in winter

No insulation means no barrier between outside air and your home

Higher energy use

Every degree your garage gains or loses is energy your climate control system has to compensate for

What Is Garage Door Insulation?

Garage door insulation is a panel system fitted to the inside of a garage door to help reduce heat transfer through one of the largest moving surfaces in a home.

ThermaDoor is Australia’s original and only purpose-made garage door insulation system. Its lightweight composite panels are designed for new and existing sectional and tilt garage doors, moving with the door as it opens and closes.

Each panel combines an insulation core, reflective foil backing and a durable vinyl face. Purpose-made spacers create an internal air cavity behind the panel to support year-round garage comfort.

Since 2012, ThermaDoor has been Australia’s garage door insulation pioneer. Developed by a registered builder with more than 45 years of construction experience, ThermaDoor introduced the first garage door insulation system to the Australian market – creating a category that did not previously exist. Learn more about our story.

ThermaDoor coined the phrase “purpose-made garage door insulation” in 2012. Find out what the term actually means, and why it matters, in our latest blog: Purpose-Made Garage Door Insulation in Australia.

Three Components. One Engineered System.

ThermaDoor is a purpose-built composite garage door insulation system. Its high-density EPS core, Sisalation foil backing and UV-stable vinyl facing are laminated to work together with an engineered air cavity—helping deliver independently verified installed-assembly R-values of R1.43 (winter) and R1.39 (summer).

High-Density EPS Core

35mm EPS core provides the primary thermal resistance in the ThermaDoor composite panel.

READ TECHNICAL DETAIL

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. As the primary insulator in the composite system, it works with the laminated Sisalation foil backing and engineered air cavity to deliver the verified installed-assembly R-value.

Sisalation Foil Backing

Laminated Sisalation foil reflects radiant heat across ThermaDoor’s engineered internal air cavity.

READ TECHNICAL DETAIL

Laminated to the rear of each panel, construction-grade Sisalation foil forms the reflective layer in the ThermaDoor composite system. Its low-emissivity surface works across the engineered internal air cavity, maintained by purpose-made foam packers. The foil also functions as a Class 2 vapour barrier and achieves Group 1 fire performance classification — it’s the same foil used to wrap Australian homes.

UV-Stable Vinyl Facing

UV-stable laminated vinyl facing helps protect the EPS core and lamination bond, maintaining a clean, durable interior finish.

READ TECHNICAL DETAIL

The composite system only performs if the materials stay intact. This durable, flame retardant, 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.

See the Difference ThermaDoor Makes

Real installs. Real results. Read the full comparison.

Want to know more about foil products used as garage door insulation? Read our blog Failed Reflective Foil Insulation: Common Mistakes We See Across Australia.

Transform Your Garage Into a Year-Round Usable Space

Homeowners across Australia are converting their insulated garages into year-round living spaces.

Insulated garage converted into a home gym with ThermaDoor garage door insulation — Home Gym Garage Conversion

Garage home office with stable temperatures thanks to ThermaDoor insulation panels — Home Office Garage Conversion

Insulated garage used as a recreation room with pool table — Man Cave Garage Conversion

Hobby studio in insulated garage using ThermaDoor purpose-built insulation — Hobby Studio Garage Conversion

Children's playroom in insulated garage — comfortable year-round with ThermaDoor — Children's Playroom Garage Conversion

Pet room in temperature-controlled insulated garage with ThermaDoor panels — Pet Room Garage Conversion

Key Benefits of ThermaDoor Garage Door Insulation

Improved Comfort

Energy Efficiency

Protection & Durability

Noise Reduction

Home Value & Lifestyle

Safety & Compliance

ThermaDoor is the only garage door insulation product in Australia with a verified complete installed assembly R-value — and the only one with data your energy assessor can actually use. Learn more about garage door insulation and home energy ratings.

ThermaDoor — Who Is It For?

Whether you’re a homeowner looking to improve comfort or a trade professional specifying insulation solutions — ThermaDoor has you covered.

For Homeowners — Two Ways to Get ThermaDoor

WE DO IT FOR YOU

Supply & Install

Our own certified technicians service South East Queensland. For the rest of Australia, our authorised distributor network has you covered.

DO IT YOURSELF

DIY Kit

Everything you need to insulate your own garage door in a few hours. No special tools, no trades required. Our step-by-step guide walks you through the whole process.

Not sure if garage door insulation is right for you? Read why garage door insulation is worth it in Australia.

DIY Kit Pricing Guide

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.

Read our How to Insulate Your Garage Door Yourself — DIY Guide

REAL CUSTOMER RESULT

Year-Round Garage Comfort

A more comfortable garage starts with the door. On a sunny 28°C autumn afternoon, Deborah’s west-facing garage door reached a surface temperature of 44.7°C.

With ThermaDoor garage door insulation installed, the same door measured 30.8°C in the same conditions, helping create a more comfortable, usable space throughout the year.

44.7°C

DOOR SURFACE TEMPERATURE

Before ThermaDoor

28°C

OUTSIDE AIR TEMPERATURE

30.8°C

DOOR SURFACE WITH THERMADOOR

After ThermaDoor

“The temperature in the space has dropped by at least 20 degrees, which has completely transformed how we can use it. Since installing ThermaDoor, it has become a comfortable, functional, and genuinely enjoyable environment. It has opened up a whole new level of independence and capacity building for my son and his team. This has been one of the most impactful upgrades we’ve made to our home.”

⭐⭐⭐⭐⭐ Deborah Ross — Google Review

What Australian Homeowners Are Saying

Google reviews and direct customer feedback from across Australia

Hear it From a ThermaDoor Customer

“I’ve had it installed three times over 12 years. It was a no-brainer.”

Peter Harding – ThermaDoor customer for 12 years

Peter Harding from Hervey Bay shares his experience with ThermaDoor garage door insulation after having it installed three times over 12 years.

      EXCELLENT  
   Based on 54 reviews 
    
 
 
 
   
 
 
       Posted on Google  
   
   Pelham Whitmore 
 
 
 
 Trustindex verifies that the original source of the review is Google. I originally planned to do a DIY installation using the insulation kit, but I'm really glad I decided to have it professionally installed. The installation looks fantastic and was well worth the price. The installer was quick, professional and took the time to make sure the garage door spring was properly balanced after the insulation was fitted. Very happy with the result and would definitely recommend them.
  
 
      Posted on Google  
   
   Jase “Bauey” Bauer 
 
 
 
 Trustindex verifies that the original source of the review is Google. Amazing product! Gives fantastic results from such an easy installation system. Has made a massive difference to our garage temperatures. The vinyl interior surface gives a classy look. Support from Karen and Peter is great also. Highly recommend!!!
  
 
      Posted on Google  
   
   caroline newton 
 
 
 
 Trustindex verifies that the original source of the review is Google. We purchased a DIY kit for our garage door to cool it down before installing a solar battery. We are really impressed with the results and have noticed a significant difference in the temperature since adding the insulation. Very glad we did it!
  
 
      Posted on Google  
   
   Shane Worrall 
 
 
 
 Trustindex verifies that the original source of the review is Google. Thermadoor's garage door insulation is the best. I have tried others and they dont even come close. Thermadoor is easy to install and the panel looks great. It looks very professional and not like an after thought. I cannot recommend  this product enpugh. You will not be disappointed if you choose to go with Thermadoor insulation. Photos to come
  
 
      Posted on Google  
   
   Deborah Ross 
 
 
 
 Trustindex verifies that the original source of the review is Google. I cannot speak highly enough of ThermaDoor and the product they have created. It is quite simply second to none. We had ThermaDoor installed on our new 16 panel, fully west facing garage door, and the result has exceeded anything I could have hoped for. The temperature in the space has now dropped by at least 20 degrees, which has completely transformed how we can use it. Our garage is not just a garage ,  it’s “the Cave” for my son, who is an NDIS participant, and his support team. We had already invested in an epoxy floor and replastering the space, but despite that, the heat made it almost unusable. Since installing ThermaDoor, it has become a comfortable, functional, and genuinely enjoyable environment. It has opened up a whole new level of independence and capacity building for my son and his team. The product itself looks premium, fits beautifully, and has made the space noticeably quieter as well , something I didn’t expect but absolutely love. Another positive for me is that the core product Is aesthetically pleasing with a beautiful vinyl panelling covering that finishes the door to a higher standard, Another 5 ⭐️ stand out of a quality solution. And then there is the service. Peter and Karen were nothing short of exceptional — knowledgeable, responsive, and genuinely invested in helping us achieve the best outcome for our son to make his space a home away from home! This has been one of the most impactful upgrades we’ve made to our home, and I know it will carry us just as beautifully through winter as it has through summer. I am so grateful,  thank you for helping us create a space that truly supports my son’s world and capacity building Deb4Sammy Mountain Creek
  
 
      Posted on Google  
   
   81micmic 
 
 
 
 Trustindex verifies that the original source of the review is Google. Everything about ThermaDoor was fantastic. Easy online ordering, fast interstate delivery and DIY installation was straight forward and a breeze. I would recommend the business and the product.
  
 
      Posted on Google  
   
   Paul Bonner 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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. The door closer mechanism was modified to close with the extra panels and it is much quieter. I would recommend this company for the great job at a very reasonable price.
  
 
      Posted on Google  
   
   Lorraine Lazzar 
 
 
 
 Trustindex verifies that the original source of the review is Google. Short review:  Garage temps have dropped 4c to 6c since installation and so glad we installed the ThermaDoor panels. Long review:  We built a new house in 2023/2024 and the garage door gets full western sun every afternoon plus we also have side glass doors on the garage for side access so it also gets lots of sun and heat.  I made sure to take note of our garage temps before installation and noticed immediately after installation the temp dropped 4c to 6c in summer and in winter its not as cold and I also noticed the noise is less, so straight away money well spent. The garage just feels more comfortable on very hot days and you really notice the difference when you open the garage door and walk out into the front yard. The install guys were really nice and local for us (Sydney) and after panel installation they also serviced our garage door to make sure everything was OK and I appreciated their extra care and clean up afterwards. Installation didnt take long and the garage door looks great, you wouldnt know it was there unless I pointed it out to you. Well worth the investment in insulating our garage door and Ive recommended them quite a few times since. Edit. We installed the Premium panels
  
 
      Posted on Google  
   
   David Dee 
 
 
 
 Trustindex verifies that the original source of the review is Google. 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 instal. Massive thumbs up!
  
 
  
  
 
     Verified by Trustindex  Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more

What Customers Tell Us Directly

Mark

I’m very happy with my garage door insulation, was an easy fit with simple instructions

Stephen, Queensland

Thanks again for your time. The difference your product has made is unbelievable. Outside door temp was 51 deg. Inside door temp was 30 deg.

David.

Wow, that came quick. Amazing! Easy to install. A couple of hours and all done!

Martin A Kelly.

We installed the ThermaDoor panels and I spent the next day rearranging my garage storage. It was a very hot day and I thought it might be cooler with the panel door open. I was wrong — it was so noticeably cooler with the door closed. The garage door insulation made a considerable difference and made it comfortable to work in.

Ready to make your garage more comfortable?

Get exact DIY pricing online or find professional installation near you.

DIY kits ship Australia-wide · Professional installation available through authorised distributors

The Complete Garage Door System

ThermaDoor panels deliver R1.43 (winter) / R1.39 (summer) verified thermal performance across the door surface. But insulation alone is not enough. The gaps around the frame — top, sides, and floor — are where heat, cold air, dust, pests, smoke, and bushfire embers bypass the door entirely.

Cleverseal garage door seals close those gaps. Fitted to the interior face of the door opening, they reduce airflow into your garage by up to 96% — so your insulation can do what it was designed to do.

Together, the panels and seals create a complete thermal and weather barrier. The door insulated. The frame sealed. The system working as it should.

Learn more about ThermaDoor insulation

Learn more about garage door seals

For Trade & Industry

The Garage Door Insulation Used and Trusted by Industry Professionals

Designed by a licensed builder who couldn’t find a product that met real construction standards – so he built one. Australia’s original purpose-built garage door insulation with independently calculated assembly R-values and full technical documentation.

Tested & Certified

Independently tested to AS/NZS 4859.2:2018. Verified R-values you can specify with confidence.

Engineering Reports

Thermal documentation available for NatHERS compliance and energy assessments.

Trade Supply

Flexible supply arrangements for garage door businesses, builders, and installers across Australia.

Technical Support

Our team understands the technical requirements. We're here to help you specify the right solution.

ThermaDoor works with a select network of approved distributors and installation partners across Australia. We’re selective about who we partner with — because our reputation depends on every installation being done right. If you’re an established garage door business or trade professional who shares our commitment to quality, we’d like to hear from you.

Architects, builders and energy assessors can access full technical documentation, engineering reports and NatHERS compliance information in our Trade & Industry Hub.

BUYER’S CHECKLIST

What to Check Before Buying Garage Door Insulation

Choosing garage door insulation is about more than selecting a material. A well-designed system should support thermal performance, door operation and clear documentation.

ThermaDoor was developed by a licensed builder with more than 45 years’ construction industry experience. Our free checklist helps homeowners, builders and trade professionals compare garage door insulation products using the questions that matter.

Before you buy, check that the sytem:

Publishes clear R-values so you can compare insulation performance with confidence
States the R-value for an installed garage door assembly, rather than a raw material or wall-insulation figure.
Supports comfort in summer and winter, with thermal performance suited to changing conditions.
Maintains an effective air cavity so the insulation system can perform as intended.
Preserves door movement and spring balance through a fixing method suited to a moving garage door.
Provides relevant compliance documentation for building, renovation or energy-assessment requirements.

Garage Door Insulation — Frequently Asked Questions

Does garage door insulation actually work?

Yes. Garage door insulation works by creating a thermal barrier between the outside climate and your home. An uninsulated garage door acts like a giant radiator in summer and a freezer in winter. By fitting a purpose-built insulation system like ThermaDoor, you block the transfer of radiant heat and cold air. This keeps the garage significantly cooler on 50-degree summer days, stops heat from bleeding into adjoining living areas, and reduces the load on your home air conditioning system.

What is the best garage door insulation in Australia?

The best garage door insulation is a system engineered specifically for the weight and movement of a sectional garage door, with independently verified R-values. Repurposed wall insulation or generic foam boards often shift, break, or fail to provide measurable thermal benefits. ThermaDoor is Australia’s original purpose-built system. It features a three-layer laminated construction that moves with your door and delivers a verified assembly rating of R1.43 in winter and R1.39 in summer under AS/NZS 4859.2:2018.

Not sure how to compare products? Download our free Buyer’s Checklist before you spend a dollar.

How much does garage door insulation cost?

The cost of insulating a garage door depends on the size of your door and whether you install it yourself. A DIY ThermaDoor kit is a one-time investment that typically costs less than a single month of running your air conditioning to compensate for an uninsulated garage. Professional supply and install services are also available for homeowners who prefer to leave it to the experts. Because ThermaDoor is built to last the lifetime of your door, the upfront cost is quickly offset by long-term comfort and energy efficiency.

Get an instant, accurate price for your specific door using our interactive price tool.

Will garage door insulation fit my existing door?

Yes. ThermaDoor is designed to fit the four major Australian sectional garage door brands: B&D, Centurion, Gliderol, and Steel-Line. These four brands account for the vast majority of panel doors installed across the country. The kits are supplied with the correct panel thickness for your specific brand to ensure a perfect, secure fit. ThermaDoor is designed for sectional panel doors only and is not compatible with roller doors.

Can I install garage door insulation myself?

Yes. ThermaDoor DIY kits are designed specifically for homeowners to install in a few hours. You do not need any special tools, construction experience, or trades to complete the job. Every kit comes with comprehensive, step-by-step instructions. If you prefer not to do it yourself, ThermaDoor has a national network of authorised installers who can supply and fit the system for you.

What is an R-value and why does it matter for garage doors?

An R-value measures how well an insulation product resists heat flow. The higher the R-value, the better the insulation performs. However, many products only quote the R-value of the raw material, which is misleading. To know how the product will actually perform in your home, you need the assembly R-value. ThermaDoor is independently tested as a complete installed system, achieving a verified assembly rating of R1.43 (winter) and R1.39 (summer). This guarantees you are getting the thermal performance you paid for.

Make your garage a more comfortable space all year round.

Get exact DIY pricing online or find professional installation near you.

DIY kits ship Australia-wide · Professional installation available through authorised distributors

Australia's Original Purpose-Built Garage Door Insulation

The Standard for Garage Door Thermal Performance in Australia

Is Your Garage Making Your Home Uncomfortable?

Hot garage in summer

Cold, damp garage in winter

Higher energy use

What Is Garage Door Insulation?

Three Components. One Engineered System.

High-Density EPS Core

Sisalation Foil Backing

UV-Stable Vinyl Facing

See the Difference ThermaDoor Makes

Transform Your Garage Into a Year-Round Usable Space

Key Benefits of ThermaDoor Garage Door Insulation

Improved Comfort

Energy Efficiency

Protection & Durability

Noise Reduction

Home Value & Lifestyle

Safety & Compliance

ThermaDoor — Who Is It For?

For Homeowners — Two Ways to Get ThermaDoor

Supply & Install

DIY Kit

DIY Kit Pricing Guide

Year-Round Garage Comfort

What Australian Homeowners Are Saying

Hear it From a ThermaDoor Customer

What Customers Tell Us Directly

Mark

Stephen, Queensland

David.

Martin A Kelly.

The Complete Garage Door System

For Trade & Industry

The Garage Door Insulation Used and Trusted by Industry Professionals

Tested & Certified

Engineering Reports

Trade Supply

Technical Support

What to Check Before Buying Garage Door Insulation

Before you buy, check that the sytem:

Garage Door Insulation — Frequently Asked Questions

DIY Kit Pricing Guide

ThermaDoor Installation

Let our experts handle installation for you Or Ask Us A Question

Make an Enquiry

Supply & Install or DIY Enquiries

Let our experts handle installation for you
Or Ask Us A Question