Many of the owners we speak with are in the same position. The house no longer suits them, but everything around it still does: the schools, the friends nearby, the local shops, the routines built over years.
Selling and buying again means giving that up, or paying a premium to find something similar nearby. For owners on the right site, a dual occupancy offers another option. You build two new homes on your existing block, move into one, and either sell or keep the other.
This guide explains what that involves, what you gain, what you give up, and how to test whether it suits your property before you commit.
Keeping the location
For most owners, location is the reason to consider this at all. Staying means keeping the things that are hard to replace:
- children staying at the same schools, or within the same school zone
- family, friends and neighbours close by
- familiar shops, parks, transport and routines
- a community you are already part of
Moving within the same area is often possible, but well-located homes rarely come up when you need them, and buying one means paying stamp duty and selling costs along the way.
A home that suits the next stage
Older houses were rarely designed for how people live now. A new home can be designed around your household as it is, and as it will be:
- better natural light and orientation
- a practical layout, with living spaces that work for the way you use them
- generous storage, which older homes almost always lack
- a ground-floor main bedroom, which makes the home easier to live in for longer
- current energy efficiency standards, with lower running costs and less maintenance
For owners whose children have left or will soon leave, this can be a way to right-size without leaving the area: less house and garden to maintain, and potentially single-level living on a suitable site.
Designing two homes with different purposes
This is where a dual occupancy for an owner-occupier differs from one built purely to sell.
The home you keep is your home. Its layout, finishes and outdoor space should suit how you live. The second home has a different job. If you plan to sell it, it needs to appeal to buyers in your area at the right price. If you plan to rent it, it needs to be durable, practical and attractive to tenants.
The two homes can therefore differ in layout, specification and landscaping, provided this is planned from the start. Decisions such as which home you keep, how each is oriented, and where to spend more or less are best made during design, when they cost least to change. In a front-and-back layout, for example, the rear home is often more private, while the front home usually commands a higher sale price.
As dual occupancy builders in Melbourne's east who also develop our own projects, we design both homes with a clear understanding of what each needs to achieve: one for the way you live, and one for the buyer or tenant it needs to attract.
Choosing what happens to the second home
Selling it
Selling the second home releases capital, which repays most of the project cost. It rarely covers all of it. In the example below, the sale covers about 83% of the project cost, and the owner still needs to fund the rest.
The sale of the second home may also be taxable, and GST can apply to the sale of new homes in some circumstances. Get advice from your accountant early, because tax can materially change the outcome.
Keeping it
Keeping the second home preserves an asset on land you already own. New homes in good locations attract strong rental demand, and a new rental property can carry depreciation benefits, including capital works deductions, generally at 2.5% a year on eligible construction costs.
The trade-off is debt. Keeping both homes means carrying the full project cost, and rent typically covers only part of the interest. Our Sell or Develop guide works through the cash flow in more detail.
No body corporate fees or meetings
Townhouse and apartment complexes usually come with an owners corporation, with annual fees, meetings and shared decisions. A dual occupancy is much simpler.
Where each home has its own land and driveway, there is no common property and no owners corporation. Where a shared driveway is held as common property, an owners corporation exists, but two-lot owners corporations in Victoria are exempt from most of the usual requirements, including meetings, financial reporting and maintenance funds. In practice, there are no management fees and no committee. The two owners look after any shared areas between them and provide an owners corporation certificate if one of the homes is sold.
Understanding the compromises
A dual occupancy is not the right choice for everyone. Before deciding, consider what you would give up:
- Less private land. Your new home will sit on part of the block, with a smaller garden than you have now.
- A closer neighbour. Someone will live next to or behind you, on land that was once yours.
- Temporary accommodation. You will need to live elsewhere for around 12 to 15 months during construction, and move twice.
- Time and involvement. From feasibility to handover typically takes 18 to 24 months, with decisions to make at each stage.
- Risk. Costs, approvals and the sale price of the second home can all move during the project.
For many owners these are reasonable trade-offs for staying in their area in a new home. For others, they are not, and it is better to know that early.
Testing the idea before you commit
The idea depends on the site supporting two good homes. In general, look for:
- a block of around 600 m² or more, with a reasonable frontage
- a General Residential or Neighbourhood Residential zone without restrictive overlays
- no significant trees, easements or covenants in the way
- a location where new homes sell or rent well
It also depends on the numbers. The comparison below is illustrative only: rounded, before tax, not based on a specific property, and not a quote or valuation. It assumes an older house in Melbourne's east worth about $1.35 million, and comparable new four-bedroom townhouses selling for about $1.9 million.
| Item | Build two, keep one | Sell and buy |
|---|---|---|
| Project cost, or purchase price | $2,300,000 | $1,900,000 |
| Stamp duty | Nil | $104,500 |
| Rent during construction, moving and conveyancing | $70,000 | $8,000 |
| Less sale proceeds | ($1,900,000) | ($1,319,000) |
| Additional outlay | $470,000 | $693,500 |
The project cost includes design, approvals, construction, subdivision, finance, contingency and the cost of selling the second home. The sale proceeds for selling and buying are for the existing house, after selling costs.
In both cases the owner ends up in a new home worth about $1.9 million. On these figures, building on their own block leaves them roughly $220,000 better off, and they stay where they want to be. A 5% lower sale price for the second home would reduce that advantage by about $95,000, which is why testing your own numbers matters.
Where to start
The first step is understanding what your site can support, what it would cost and what the outcome is likely to be. A feasibility assessment tests the planning controls, site constraints, layout, costs and likely values before you invest in design.
If you would like to understand the full journey first, our development process guide explains each stage, from feasibility to handover.
