One of the biggest mistakes is starting with a target yield.
An investor decides they want 9%, 10% or some other number and then searches for a property configuration capable of producing it.
That can push the analysis backwards.
The rent ultimately comes from residents, so I would rather begin by understanding who is likely to rent the rooms and what they are realistically prepared to pay.
Another mistake is building more rooms simply because another bedroom increases the projected gross income.
There is a point where design starts working against the resident.
If adding another bedroom makes the common areas cramped or creates an awkward living environment, the extra theoretical rent may come with a leasing cost later.
Cheap land creates another trap.
A lower purchase price can improve the projected yield on paper. But if the property is too far from employment, transport or the places residents need to reach regularly, the room demand may never justify the original assumptions.
Then there is occupancy.
A feasibility based on every room being occupied for 52 weeks of the year gives the investor very little room for normal tenant movement.
Utilities are another area that can be underestimated, particularly where they are included within room rent. Management costs can also surprise investors who compare specialist co-living management directly with the fee charged on a conventional residential tenancy.
Planning and compliance deserve the same attention.
The rules differ by state and can change according to the number of residents, room configuration, use of the property and local planning requirements. In Victoria, for example, rooming houses are subject to specific registration, operator licensing and minimum-standard requirements.
Queensland has separate rules governing rooming accommodation, while South Australia applies its own rooming-house framework.
Finally, investors need to be careful about assuming that growing interest in co-living means almost any new project will work.
More investors entering the market can also mean more competing room supply.
The feasibility still needs to stand on its own.