The short version
- A rooming house earns the most rent from a block, because every room is leased separately, and one empty room costs about 11% of the income.
- A duplex or dual occupancy earns two rents and appeals to a much wider pool of lenders and buyers, especially if the lot is subdivided so each dwelling can be sold separately.
- Rooming houses come with more ongoing rules: council registration, an operator licence and minimum standards. Two dwellings on a lot need a planning permit, while a small rooming house can be exempt.
- Choose a rooming house for income, and a duplex for flexibility and a broader resale market.
What each one is
- Rooming house. One building, approved as Class 1b, where rooms are rented separately to four or more residents who share some facilities. It stays on one title.
- Duplex. Two dwellings, often side by side and sharing a wall. They can often be subdivided onto two titles and sold separately.
- Dual occupancy. Two dwellings on one lot, such as a house with a second house or unit behind it. Some are later subdivided, some stay on one title.
Side by side
| Rooming house | Duplex or dual occupancy | |
|---|---|---|
| Tenancies | Up to 9 rooms (12 residents) under the Clause 52.23 exemption | 2 |
| If one tenancy is empty | About 11% of the rent stops | About 50% of the rent stops |
| Planning | No permit in most residential zones if every Clause 52.23 condition is met | A permit is required to construct two or more dwellings on a lot |
| Building class | Class 1b | Class 1a |
| Ongoing rules | Council registration, operator licence, rooming house minimum standards | Standard residential tenancy rules |
| Management | Hands-on: many residents, bills usually included | Similar to any standard rental |
| Finance | Fewer lenders | Mainstream residential lending |
| Resale | Sold whole, mostly to investors | Owner-occupiers and investors; each dwelling can be sold separately if subdivided |
The income gap, on the same block
Take our Noble Park project. Nine suites at $380 a week bring in $3,420 a week, or $177,840 a year.
For a duplex on the same block to match that, each side would need to rent for $1,710 a week. For comparison, the calculator on our homepage assumes $550 a week for a standard house rented to one household. Get local rent appraisals for both options before you decide, and compare the yield on the total cost, not just the rent.
The rooming house’s extra income comes with extra costs. In the Noble Park feasibility the owner pays about $35,424 a year in running costs, including utilities, because residents’ bills are included in the rent. A duplex tenant usually pays their own bills. Our cost guide breaks this down.
Planning and approvals
In Victoria’s General Residential Zone, the planning scheme says “A permit is required to … Construct two or more dwellings on a lot.” That permit is assessed against the ResCode standards and can take months.
A rooming house can be exempt. Clause 52.23 removes the need for a planning permit to use and build a rooming house in most residential zones if every condition is met, including that the total floor area “does not exceed 300 square metres”, no more than 12 people are accommodated, no more than 9 bedrooms are provided, and bedrooms “can only be accessed from within the building”. Check each condition for your site with a town planner.
The building permit is a separate step either way. A rooming house needs Class 1b approval. Our Class 1b guide explains what that means.
Resale and flexibility
This is where duplexes and dual occupancies win. Owner-occupiers can buy them, so there are more potential buyers. If the lot is subdivided, you can sell one dwelling and keep the other, or live in one and rent the other.
A rooming house is sold as a whole, mostly to other investors, and it can’t easily become a family home without work. It suits investors who plan to hold for the long term and want the income. Our risks guide covers this in more detail.
Which suits you?
- Choose a rooming house if your priority is income, you plan to hold long term, and you’re comfortable with a professionally managed, more regulated property.
- Choose a duplex or dual occupancy if you want lower management intensity, mainstream finance, the option to sell one dwelling or live in one, and a broader resale market.
- Either way, compare the total cost, the rent, the running costs and the yield for the specific block, not averages.
Questions
Which has better capital growth?
Growth mostly comes from the land, which is the same block either way. A duplex may appeal to more buyers, which can help when you sell. A rooming house is usually valued with its income in mind. Neither is guaranteed to grow.
Can I turn a duplex into a rooming house later?
Not easily. A rooming house needs Class 1b approval, council registration, a licensed operator and a layout suited to many private rooms. Converting two dwellings into that is usually a major project with its own permits.
What about a granny flat?
Victoria allows a small second dwelling on many lots. In the General Residential Zone, a permit is only required to build one on a lot of less than 300 square metres. It adds one extra rent, not several, so it’s a smaller step than a duplex or rooming house.
Sources
- Victoria Planning Provisions, Clause 52.23 Rooming house
- Victoria Planning Provisions, Clause 32.08 General Residential Zone
- Australian Building Codes Board, NCC building classifications
- Consumer Affairs Victoria, Rooming house operators licensing scheme
- Whitehorse City Council, Rooming house
- Keyspace Property, current project list and feasibilities
Written by Keyspace Property
We find the land, arrange the build and manage purpose-built rooming houses for investors in Victoria. We’re paid by the builder, so we’re not independent. How we’re paid.
General information only, not financial, tax or legal advice. Figures from Keyspace feasibilities are projections based on the assumptions shown, not guarantees. Rules and rates are as at 26 September 2026; check them before you act, and get independent advice about your own situation.