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The Required Difference in Size of Indoor and Exterior Doors

April 28, 2023

There are several personalisation choices for indoor and exterior doors to consider when purchasing new ones for your house. Type, colour, locks, and other factors are all vital for every door, but door size is also critical to the overall design.This may appear to some to be a little detail, but it is vital to consider the proper size for doors to ensure they suit the size of an existing or new house. This page will compare interior vs. exterior and typical door sizes in Australia.

Do Interior And Exterior Doors Come In Different Sizes?

One of the first things to consider is the size difference between exterior and interior doors.For various reasons, inside doors are often smaller than external doors. One advantage is that they do not have to accommodate furniture or other large things carried into the house. Interior doors are also less durable than outside doors since they are not exposed to the weather and do not require as much security.

On the other hand, external doors must be sturdy enough to endure severe winds and rain while providing high security. As a result, they are often composed of tougher materials, such as steel or aluminium, and are thicker than interior doors.Glass doors, bespoke doors, bifold doors, flush doors, and other types of doors can have varied widths depending on whether they are external or inside doors.

Sizes Of Interior Doors

Internal doors in Australia are typically 820mm x 2040mm in size. The usual door width and height ranges are 55-85cm and 200-215cm, respectively. These specifications, however, vary slightly depending on the door maker.If you want an inside door smaller than normal interior door measurements, doors as narrow as 60cm wide are available. The typical thickness of most interior doors is 35mm.

Sizes Of Exterior Doors

External doors in Australia are typically 870mm x 2040mm in size. The common ranges are larger than interior doors, with widths ranging from 60-95cm and heights ranging from 200-225cm. Again, some variations may occur depending on the manufacturer. If you want an outside door that is broader than the typical size, doors up to 120cm wide are available.The normal outside door thickness is 40mm thicker than the conventional internal door thickness of 35mm in various configurations such as panel doors or folding doors.

Why Do Doors Come In Different Sizes?

Various sizes of doors are required for various functions. Because interior doors do not need to be as sturdy or secure as outside doors, they can be built of lighter materials and are not have to be as thick. External doors must survive inclement weather and be sturdy enough within their door frames to dissuade attackers. Thus, they are composed of thicker, stronger materials.

The typical door size for commercial and residential structures is also different. Commercial doors must frequently be wider to allow items such as wheelchairs or carts, but residential doors must be broad enough for individuals to go through easily.

Other Justification for the Difference in Door Size

Indoor and exterior doors differ in size for several reasons.


Exterior doors provide security, insulation, and protection from the elements, while indoor doors are primarily designed to provide privacy and separate interior spaces. As a result, exterior doors are often thicker and heavier than indoor doors.

Standard Sizes

Standard exterior door sizes aretypically wider and taller than standard indoor doors. This is because exterior doors must accommodate larger entryways and provide clearance for people and larger items, such as furniture or appliances.

Structural Differences

Exterior doors often have additional features, such as weatherstripping, a threshold, and a lockset, which can add to their overall size and weight. On the other hand, indoor doors are typically simpler in design and do not require as many structural elements.

Building Codes

Local building codes often dictate the minimum size and thickness of exterior doors for safety and security reasons. This may require exterior doors to be larger and thicker than indoor doors.

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