Internal & External Door Sizes in Australia 2026

Choosing the right internal and external door sizes before you order saves real money and frustration. Whether you are swapping out a tired door in a period home or fitting out a new build, the dimensions need to match your frame, your walls, and the way each room is used. Measure your openings first, check them twice, and you will be in a far better position to pick a door that fits without costly trimming or frame adjustments.

The standard internal door size in Australia is 82 cm wide x 204 cm high x 3.5 cm thick.

External doors are the same width and height but 4 cm thick.

Internal and external doors in 2026 come in six common standard widths: 52 cm, 62 cm, 72 cm, 77 cm, 82 cm, and 92 cm.

There are two standard heights: 204 cm (traditional) and 234 cm (for homes with 270 cm or higher ceilings). Below is a guide on the most common sizes, dimensions, and materials.

Standard Internal Door Sizes and Dimensions

The most common internal door size in Australia is 82 cm wide by 204 cm high by 3.5 cm thick. This has been the go-to for decades and is the size most readily stocked by Australian retailers. If your home was built in the last 30 years, there is a good chance your internal doorways were framed for it.

For bedrooms and living areas, the 77 cm and 82 cm widths are most popular. An 82 cm door gives comfortable clearance for everyday traffic and lets you move furniture through without drama.

Bathrooms and laundries typically take 72 cm. Linen closets or pantries might only need 62 cm or 52 cm.

In newer Australian homes with ceiling heights of 270 cm or more, the 234 cm tall door is becoming the preferred choice. It looks proportional against taller walls and opens up the room visually, which is noticeable in the open-plan layouts common across modern Australian builds.

Standard External Door Sizes and Dimensions

External doors share the same width options as internal doors, but they are thicker: 4 cm instead of 3.5 cm. That extra half centimetre adds weather resistance, better insulation, and more rigidity for locks and deadbolts.

The most common external door in Australia is 82 cm wide by 204 cm high.

For front entries, 82 cm and 92 cm are the popular widths. A 92 cm entry door feels more generous when you walk through it and makes getting a couch or fridge inside far less painful. If you live somewhere warm, as many Queenslanders do, a wider entry door paired with a screen door can noticeably improve airflow through the home.

Double entry doors are worth considering if you entertain regularly. A standard pair gives you a combined opening of around 170 cm, with each leaf at 82 cm wide.

French Door Sizes and Dimensions

French doors remain a favourite in Australian homes, and it is easy to see why. A pair of glazed French doors floods a room with natural light and, when open, makes the transition between your living area and a deck or courtyard feel effortless.

Each leaf typically measures 62 cm, 72 cm, or 82 cm wide.

At the standard 204 cm height with 4 cm thickness, a pair of 82 cm French doors gives you a total opening of 164 cm. That is wide enough to move freely between rooms or carry platters out to the table without turning sideways.

The 234 cm high versions suit taller ceilings. A pair of 72 cm doors (144 cm total opening) works well for bedrooms and studies, while 82 cm leaves suit main living areas.

Bifold Door Sizes and Dimensions

Bifold doors are a strong choice if you want to open up an entire wall between your living area and an alfresco zone. They fold back flat to give you the widest possible opening, which suits the way most Australians entertain.

Standard heights are 204 cm or 234 cm.

Individual panels are 3.5 cm thick for internal use. Each panel is typically between 72 cm and 92 cm wide. For coastal homes on the Gold Coast, Sunshine Coast, or Sydney's Northern Beaches, 4 to 6 panel configurations are common because they open up the full width of a living wall to the deck or pool area.

Sliding Door Sizes and Dimensions

Sliding doors make sense where a hinged door would eat into usable floor area. Standard widths match other internal doors: 62 cm, 72 cm, 77 cm, 82 cm, 87 cm, or 92 cm per panel, with heights of 204 cm or 234 cm.

Cavity sliding doors disappear into the wall when open, which is why they are popular in smaller Australian homes and apartments where every centimetre counts. The cavity unit needs to match your door height (204 cm or 234 cm) and wall stud thickness (typically 7 cm, 7.5 cm, 9 cm, or 10 cm).

One thing to check early: the wall beside the opening must be free of plumbing and electrical runs, or the cavity will not fit.

Additional Door Size Considerations

1. National Construction Code (NCC) compliance.
   The NCC 2022 requires at least one external doorway on the ground floor to have a minimum clear opening of 82 cm. Several internal doorways to designated rooms must also meet this 82 cm clearance. If you are building new or renovating, check with your builder or certifier to make sure your chosen door sizes comply.
2. Frame and opening allowances.
   The door itself is not the full picture. Your rough opening needs to be approximately 6 cm wider and 4 cm taller than the door frame to allow for the frame, shims, and adjustment. So for an 82 cm x 204 cm door, plan for a rough opening of around 88 cm x 208 cm.
3. Trimming limits.
   Most manufactured doors allow a maximum of 5 mm to be trimmed from each edge. If your opening is significantly out of square or oversized, you may need to adjust the frame rather than cutting the door, which can compromise its structural integrity.
4. Weight and hinge requirements.
   A standard hollow-core internal door weighs around 12 to 15 kg, while a solid-core door can weigh 25 to 40 kg depending on its size and material. Heavier doors need appropriately rated hinges, typically three hinges rather than two for anything over 20 kg. External doors, being thicker and denser, generally sit at the heavier end.
5. Clearance for flooring.
   Leave at least 10 mm clearance between the bottom of the door and your finished floor. If you are planning to install thicker flooring such as timber boards or tiles, factor in the added height so the door does not drag or need to be trimmed after the fact.

Common Door Materials

Timber remains the most popular door material in Australia. But it is not the only option, and the material you choose affects overall dimensions, weight, and how the door performs in your home over the years.

Engineered Timber (MDF Veneer over Engineered Core)

Engineered doors use a lightweight core (often paulownia) wrapped in an MDF veneer. The paulownia core resists warping and bowing, which matters in Australia where temperature swings and seasonal humidity can cause solid timber to shift. The MDF veneer gives a consistent, flat surface that takes primer and paint evenly.

Pros:

• Dimensionally stable; resists warping in humid or variable climates
• Lighter than solid hardwood, so standard hinges and handles are fine
• Flat, even surface that takes paint well
• Lower price point than solid timber

Cons:

• Cannot be sanded back and re-stained like solid timber
• Not suitable for external use unless specifically rated for it
• Limited trimming allowance (usually 5 mm maximum per edge)

Solid Timber

Solid timber doors bring a visible grain and tactile warmth that engineered options cannot replicate. Species like hemlock, cedar, and Victorian ash are common in Australia. A standard 82 cm x 204 cm solid timber door can weigh 25 to 35 kg, so you will need three hinges and heavier-duty hardware.

Pros:

• Visible natural grain that can be stained, oiled, or left raw
• Can be sanded and refinished multiple times over its lifetime
• Dense enough to noticeably reduce sound transfer between rooms

Cons:

• Heavier, which affects hinge and hardware selection
• Can expand and contract with humidity changes if not sealed on all six sides
• Higher price point than engineered alternatives

Aluminium

Aluminium is the dominant material for sliding and bifold door frames, particularly on external openings. It is lightweight, corrosion-resistant, and handles coastal salt air without the maintenance timber demands. Aluminium frames also tend to be slimmer than timber, so you get a larger glass area for the same overall opening.

Pros:

• Lightweight and corrosion-resistant, well suited to coastal Australian homes
• Slimmer frame profiles mean more glass and more natural light
• Low maintenance: no painting or sealing required

Cons:

• Poor thermal insulation without a thermal break, which can be an issue in colder climates like Tassie or the highlands
• Limited aesthetic warmth compared to timber
• Can dent or scratch, and repairs are harder than repainting timber

Steel

Steel doors are the go-to for external applications where security matters most. A standard steel entry door can weigh 35 to 50 kg with a thickness of around 4 to 4.5 cm. That weight means you need to confirm your frame and hinges are rated for it.

Pros:

• Strong impact resistance and tamper deterrence
• Good thermal and acoustic insulation when filled with a foam core
• Fire-rated options available for bushfire-prone areas (BAL ratings)

Cons:

• Heaviest option, requiring stronger hardware and careful hanging
• Can rust if the powder coat is chipped, particularly in coastal areas
• Fewer design options compared to timber

For most homes, engineered timber is the reliable pick for internal doors. Solid timber adds visible grain and character where you want to make more of a statement. Aluminium is hard to beat for external sliders and bifolds. And steel is worth the investment where entry security is a genuine concern. In humid climates like Brisbane or Darwin, dimensional stability matters more than in Melbourne or Hobart, so engineered cores tend to outperform solid timber on internal doors.

How to Choose the Right Door Size and Style

1. Measure the existing opening first
   Measure the width, height, and depth of your opening in three places (top, middle, bottom for width; left, centre, right for height). Take the smallest figure as your guide. This tells you whether a standard size will fit or if the frame needs adjustment.
2. Match door height to ceiling height
   Standard 240 cm ceilings pair well with a 204 cm door. If your ceilings are 270 cm or higher, a 204 cm door will look undersized. Go with 234 cm.
3. Consider furniture and accessibility
   An 82 cm door meets the NCC accessibility requirement and handles everyday traffic. If family members use mobility aids, or you want to future-proof, a 92 cm door is worth the modest additional cost.
4. Think about the room's purpose
   Bathrooms can work with 72 cm. Living areas and master bedrooms benefit from 82 cm or wider. For rooms that open to the outdoors, French doors or bifolds give you options a single hinged door cannot.
5. Factor in climate
   In warmer parts of Australia, wider entry doors paired with screen doors improve airflow through the home. For south-facing entries in cooler states, a solid, well-insulated door with weather seals will have a noticeable effect on your heating bills.

Best Doors Chosen By Schots

Nicholson 82cm Internal 4 Panel Door, White Primed - $619.00

A four-panel door with clean, traditional proportions that sit well in both older and contemporary homes. The engineered paulownia core resists warping in variable climates, the MDF veneer surface takes primer and paint evenly, the 82 cm width fits Australia's most common door openings, and the edges can be trimmed up to 5 mm for minor fit adjustments.

Pair of 82cm Internal Glazed French Doors, White Primed and Clear Glass - $1,149.00

A pair of glazed French doors that let natural light travel between connecting rooms. Clear glass panels maximise light transfer, each leaf is 82 cm wide (164 cm total opening), the white primed finish is ready for your choice of paint colour, and the engineered core keeps the doors dimensionally stable through seasonal humidity changes.

Pair of Tall 82cm Internal Glazed French Doors, White Primed - $1,329.00

Sized for homes with 270 cm ceilings, these French doors stand 234 cm high and look proportional against taller walls where a standard-height door would appear squat. Each leaf is 82 cm wide with a 4 cm thickness, the engineered paulownia core prevents warping, and the white primed surface is ready for finishing in your choice of colour.

Edwardian Internal 3 Panel 77cm Door, MDF White - $559.00

A three-panel door with Edwardian period detailing that suits heritage-style Australian homes. The three-panel profile echoes the proportions of original Edwardian joinery, the 77 cm width fits bedrooms and secondary rooms, the MDF white primed finish gives a flat, even base for painting, and the engineered core holds its shape through temperature and humidity shifts.

Start with the measurements, pick the style that suits your home, and the right door tends to follow. Browse the full range of internal doors and wooden doors at Schots, or visit the Clifton Hill showroom to see and handle the doors in person before you commit.