One roof, two self-contained dwellings.
A dual-key home splits one building into two private dwellings under one title. Let both sides, or live in one and rent the other. Two rents, one build contract, one loan.
Last updated 14 June 2026. Figures are illustrative, general information only, not advice.
A dual-key home is a single building under one title divided into two self-contained dwellings, each with its own entry, kitchen and bathroom. The Property Plug prices dual-key builds against real suburb siteworks for 102 Perth suburbs, so the two-rent yield you model uses the actual all-in build cost, not a teaser.
Dual-key versus granny flat
Both give you two rents from one title, but they suit different blocks and budgets. A dual-key home is one structure, so it fits a tighter lot and costs less than building two separate dwellings. A granny flat is a detached second dwelling, more flexible and its own depreciable asset, but it needs the backyard for a second build.
| Feature | Dual-key home | Granny flat |
|---|---|---|
| Structures | One building, split internally | Two buildings |
| Block size | Suits tighter lots | Needs backyard space |
| Relative cost | Lower than two structures | Higher, second build |
| Titles | One | One |
| Management | One building, one policy | Two buildings to maintain |
Two tenancies from one build.
| Build all-in (land separate) | $335,528 |
|---|---|
| Dwelling A indicative rent | $420/week |
| Dwelling B indicative rent | $360/week |
| Combined rent | $780/week ($40,560/year) |
| Combined gross yield on build | 12.1% (vs 9.6% as a single let) |
Yield against build cost only. Add land for true net yield. Rents are indicative assumptions. Illustrative and general information only.
Why investors choose dual-key
- Two incomes, lower vacancy risk. If one side is empty, the other still pays. Two smaller tenancies are easier to re-let than one large one.
- Fits a smaller block. One structure means dual-key works where there is no room for a detached granny flat.
- One title, one loan. Lenders generally treat the one title as a single security, simpler than financing two properties.
- Full new-build depreciation. One fresh depreciation schedule across the whole building lifts after-tax cashflow.
- Turnkey both sides. A turnkey contract lets both dwellings the day they hand over.
If your block has room for a detached second dwelling, compare the granny flat route. To model the single-tenancy baseline first, see the rental yield guide. Allow 12 months for a dual-key build from build start.
This is general information only and does not take into account your objectives, financial situation or needs. It is not credit assistance or a credit quote. Consider whether it is right for you and seek advice. Finance is arranged through Central Lending Solutions, the licensed credit partner The Property Plug works with (Australian Credit Licence or credit representative number [TBC]).
What is a dual-key home?
A dual-key home is a single building under one title divided into two self-contained dwellings, each with its own entry, kitchen, bathroom and meter where designed. You can rent both sides to separate tenants, or live in one and rent the other, from one build contract.
How is dual-key different from a granny flat?
A dual-key home is one structure split internally, so it suits a tighter block and costs less than two separate buildings. A granny flat is a second, fully detached dwelling in the backyard, more flexible but it needs the land for a second structure. Both give you two rents from one title.
What yield can a dual-key home achieve?
Two rents from one build lifts gross yield. As an indicative example, a dual-key build of about $335,528 in Baldivis at indicative rents of $420 and $360 per week returns roughly 12.1% gross, versus about 9.6% if the same building let as a single home. Illustrative, not a forecast.
Can I get one loan for a dual-key home?
Usually yes. Because a dual-key home sits on one title, lenders generally treat it as a single security, simpler than financing two titles. Our in-house finance arm structures the construction loan around the dual-key build.
Is a dual-key home easier to manage?
One title, one building, one insurance policy and one set of grounds make a dual-key home simpler to hold than two separate properties, while still collecting two rents. We are paid by the builder, never by you.
Model a dual-key build
One short request. We price a dual-key build for your suburb and run the two-rent yield with you. Free to you, no obligation.