Standard study and home office size in Australia
How much room a working desk actually needs, what a study has to have to be usable full-time, and when a nook beats a room.
A study is a desk, a chair with room to push it back, and (if anyone works there full time) a door.
The numbers
| Minimum width | 2,100mm |
| Minimum floor area | 5.5m² |
| Comfortable width | 3,000mm |
| Comfortable floor area | 9.0m² |
| Maximum proportions | 2.5:1 before it reads as a corridor |
Where the minimum comes from: a 1500 desk against one wall plus 600 to push a chair back.
Source: AU project-home convention (last checked 4 August 2026). Convention, not code. Calibrated against published builder and trade guidance; see docs/design-rules.md.
These are the figures Draftie's layout review measures your plan against, generated from the same table the checker uses, so this guide and the tool cannot disagree. Minimums are the point below which a room stops working, not a legal floor: outside ceiling heights, ventilation, sanitary facilities and egress, the NCC does not mandate most room dimensions.
The desk
A 1,500mm desk against one wall plus 600mm to push the chair back gives the minimum width. That is a functional working position and nothing else: no second chair, no printer, no room to stand behind someone.
At the comfortable figure you get a desk, a chair, storage, and space for a second person to be in the room, which matters if you take calls with someone else present, or if two people share.
| Setup | Space needed |
|---|---|
| Desk against a wall | 1,500 × 2,100mm |
| Desk + storage + second chair | 3,000 × 3,000mm |
| Two desks facing | 3,000mm+ across |
| Desk nook in a hallway or living area | 1,200 × 700mm |
What makes a study usable full time
Since a lot of Australians now work from home some or all of the week, the difference between a nominal study and a working one:
- A door. The single biggest factor. Video calls, concentration, and being able to stop working are all door-dependent.
- A window. Habitable-room light and ventilation requirements apply if it is a habitable room, and a windowless study is grim regardless of what the code allows.
- Power and data where the desk is, not on the far wall.
- Not facing a window directly. Backlight ruins video calls; sun on the screen ruins everything else. Desk perpendicular to the window is the usual answer.
- Away from the living area. A study off the main living space is a study you cannot use while anyone else is home.
Study, nook or fourth bedroom
Worth being honest about which you are building:
- A nook (1,200mm of bench in a hallway or off the living area) is genuinely useful for homework and paying bills, and useless for full-time work.
- A study at 2,100mm+ with a door does the job.
- A study that is really a small bedroom (2,700mm+, with a window and a robe) is the flexible option, and the one that counts as a bedroom when you sell.
That last point is worth planning around: the difference between a 2,100mm study and a 2,700mm bedroom is 600mm, and one of them adds a bedroom to your listing.
Checking your own plan
Draw the room, put the furniture in it, and see what is left. Draftie flags every room that falls under the figures above and tells you the shortfall in millimetres, so you find out on the drawing rather than after a builder prices it.
Related: standard room sizes across the whole house, and how to read a floor plan.
FAQ
How big does a home office need to be?
About 2,100mm wide and 5.5m² as a minimum: a 1,500mm desk with 600mm to push the chair back. Around 3,000mm and 9m² is comfortable and fits storage and a second chair.
Does a study need a window in Australia?
If it is classed as a habitable room, the NCC’s light and ventilation requirements apply, which effectively means a window. Beyond the code, a windowless study is unpleasant to work in for a full day.
Is a study or a fourth bedroom better?
A room at 2,700mm+ with a window and a robe can be either, and counts as a bedroom when you sell. A dedicated study at 2,100mm is cheaper in floor area but locks in the use: the difference is only 600mm of width.
Related guides
Standard living room size in Australia
Standard laundry size in Australia
Standard kitchen size and layout dimensions in Australia
Check these numbers against your own plan
Draw your layout in Draftie and every room reports its real dimensions as you move a wall, so a room that is 200mm too narrow shows up before a builder finds it.
Check your plan, freeGeneral information for Australian residential projects, not professional advice. Product specifications and prices change, confirm current details with the manufacturer or supplier before you rely on them. Draftie produces concept plans, not construction documents.