A Melbourne couple wants a 2 bedroom granny flat for an older parent. The second room may begin as a study, but could later be used by a carer, visiting family member or renter.
The first plan gives both bedrooms almost equal importance. The second creates one more comfortable primary bedroom and a smaller flexible room.
Both plans contain two bedrooms. They do not support the same people or the same future choices.
The short answer
Equal bedrooms usually make more sense when two adults, siblings or housemates may occupy the dwelling. A larger primary room with a smaller second room may suit a parent living alone, a couple needing a study, or a household where one room will be used occasionally.
The decision should be based on furniture fit, storage, privacy, daylight and likely occupants. It should not be based on bedroom labels alone.
You can review MPLUS 2 bedroom granny flat designs first, then compare how each layout allocates its limited floor area.
Why this decision matters within 60 square metres
Current Victorian guidance defines a small second dwelling as a self-contained home with a floor area of no more than 60 square metres on the same lot as an existing dwelling.
The Building and Plumbing Commission explains that the area is measured from the outside of external walls or the centre of party walls and includes all roofed areas. The available space must still accommodate the kitchen, bathroom, toilet, laundry facilities, circulation and living area.
That creates a real trade-off. Making one bedroom larger may reduce the other bedroom, living area, storage or hallway. Making both bedrooms equal may produce a more flexible plan, but it can also prevent the primary room from gaining the extra clearance a long-term occupant needs.
When equal bedrooms work better
Equal bedrooms are useful when the occupants have similar needs.
This may include:
- two adult children
- siblings sharing independent accommodation
- two unrelated adults
- a parent and regular overnight support person
- a rental strategy intended to remain flexible
Bedroom equality is not only about floor area. Each room should be tested with the intended bed, bedside furniture, robe access, door swing and a practical route to the window.
If one room receives better daylight, more storage and easier bathroom access, the plan may not feel equal even when the dimensions are similar.
When one larger bedroom makes more sense
A larger primary room may be the better use of space when one person will live in the granny flat most of the time.
The extra area might support:
- a larger bed with comfortable circulation
- more accessible movement around furniture
- additional wardrobe storage
- a reading chair or dressing area
- easier long-term use if mobility changes
The smaller second room can still be valuable as a study, guest room, hobby room or occasional support space. The important question is whether it remains genuinely usable for its intended purpose.
A room shown with a small bed on a drawing may not work as expected once a desk, robe, door swing and heating or cooling requirements are considered.
Test the furniture, not just the room dimensions
Before approving a floor plan, place realistic furniture on it at scale.
Check each bedroom for:
- the intended bed size
- a clear route from the door to the bed and window
- enough space to open robe doors and drawers
- power points in practical positions
- wall space for a desk, television or additional storage if needed
- privacy when the bedroom door opens
This simple test often exposes wasted corners, door conflicts and rooms that technically exist but do not support everyday use.
The broader granny flat design guide can help you compare bedroom planning with kitchen, living and outdoor-space priorities.
Do not sacrifice the shared living area
Two generous bedrooms can still produce a poor 2 bedroom granny flat if the living and dining area becomes difficult to furnish.
Check whether the shared area can hold a sofa, dining table and clear route to the kitchen and outdoor space at the same time. A narrow leftover passage between furniture is not the same as a comfortable living room.
The most useful plan balances private and shared areas. It does not maximise every bedroom independently.
Daylight and privacy may decide which room should be larger
The block orientation and neighbouring buildings can make one side of the granny flat more suitable for a primary bedroom.
Consider:
- which external walls can receive useful windows
- whether a window faces the main house or a neighbour
- morning and afternoon sun
- noise from driveways, outdoor areas or services
- the route from both bedrooms to the bathroom
- whether bedroom doors open directly toward the kitchen or entry
These questions are difficult to answer from a standard plan without placing it on the actual property. The Land Eligibility Check explains why usable backyard shape, setbacks, access and services should be reviewed before the internal layout is fixed.
Compare the two options on one page
| Design question | Equal bedrooms | One larger bedroom |
|---|---|---|
| Likely occupants | Two adults or changing household needs | One main occupant, couple or parent |
| Furniture approach | Similar bed and storage capacity | More space in the primary room |
| Shared living | Must be protected from two larger rooms | May retain more area if the second room is compact |
| Rental flexibility | May suit shared occupancy more easily | May suit a couple plus study or guest room |
| Future changes | Rooms can swap roles more easily | Primary room supports longer-term comfort |
This is a design comparison, not a promise about rental demand or return. If project budget is also influencing the choice, compare the complete scope through the Granny Flat Cost Victoria guide, rather than assuming a small wall adjustment is the only cost difference.
Choose the occupants before choosing the room hierarchy
Write down who is likely to use each bedroom now, in five years and if the property is rented later. Then test both rooms with realistic furniture and place the plan on the actual block.
If you are unsure which 2 bedroom granny flat arrangement fits your Melbourne property, MPLUS can review the address, usable space and obvious site constraints through the Free Land Check.
Sources checked
- Building and Plumbing Commission: Small second dwelling
- Victorian Government: Making it easier to build a granny flat
- Consumer Affairs Victoria: Rental properties minimum standards
- National Construction Code: Ventilation
Information checked on 27 August 2026. Final room sizes, windows, ventilation, structure and siting must be confirmed through the project design and building permit documentation.
