Granny flats
The Property Plug lists 8 granny flat designs for Perth, from $217,500 for the build before siteworks. Each is an ancillary dwelling built under WA's 70m2 rentable rule, ideal for dual income or extended family. We name your matched panel builder once you request access at no cost to you.
Who these granny flats suit
These 8 ancillary dwellings suit investors chasing a second income on an existing block, families housing parents or adult children, and owners wanting to lift their property's yield without buying more land. Under WA rules a granny flat up to 70m2 of rentable area can be let to anyone, so the income is not limited to family.
Each design carries a real "from" price for the build. Your landed cost is that base figure plus your block's siteworks and connections, which we price for your exact lot. Because The Property Plug is a broker, we present these honest from-prices across the panel rather than gating them, then introduce you to the matched builder with a fixed quote. We are paid by the builder, never by you.
Granny flats vs new homes
A granny flat is a secondary dwelling on an existing lot, capped at 70m2 and built in roughly 8 months. A new home is a full standalone build on its own title. If you are building your primary residence or a full investment property, the 38 new home designs are the right collection. Choose a granny flat when you want dual income or family accommodation on land you already hold.
- Dual income on an existing block under the WA 70m2 rentable rule.
- Extended family living with independence and a separate entrance.
- Yield uplift on a property you already own, no second land purchase.
Base home prices only, before siteworks and land. Final landed cost is the base plus your suburb's real siteworks, which we price for your block at no cost to you.
| Design | Beds | Baths | Block from | Home from |
|---|---|---|---|---|
| Haven | n/a | n/a | n/a | $217,500 |
| Tranquil | n/a | n/a | n/a | $225,700 |
| Retreat | n/a | n/a | n/a | $232,100 |
| Cosy Corner | n/a | n/a | n/a | $246,600 |
| Generation | n/a | n/a | n/a | $263,000 |
| Sunset | n/a | n/a | n/a | $263,300 |
IndicativeEstimate only, not a quote or an offer. Figures combine a home design starting price with the suburb siteworks and do not include land. Designs, builders, land and pricing change and are subject to availability. We confirm a fixed price with your matched builder on enquiry.
How much does a granny flat cost to build in Perth in 2026?
Granny flat designs on The Property Plug panel start from $217,500 for the build, before siteworks and any connections. Your landed figure is the base build price plus your block's real siteworks, which we price for your exact lot at no cost to you.
What is the WA 70m2 granny flat rule?
In Western Australia an ancillary dwelling (granny flat) can be built on a single residential lot and legally rented out, provided the floor area does not exceed 70m2. Every design in this collection is sized to comply, so you can run it as a separate income stream.
Can I rent out a granny flat in Perth?
Yes. WA allows ancillary dwellings up to 70m2 to be rented to anyone, not just family, which is what makes them a genuine dual-income play. We can price the build for your block and connect you to an investor-focused finance conversation through our finance arm.
How long does a granny flat take to build?
Build time is around 8 months from site start, subject to your block and selections. We confirm a firm program once your panel builder is matched.
See these designs priced for your block
One request unlocks your matched panel builder and a fixed price for your suburb. Free to you, no obligation.