16/07/2026
How Much Does a Granny Flat Cost in Perth? (2026 Guide)
One of the first questions we get asked is:
"How much does a granny flat actually cost?"
The honest answer is... it depends on your block, your design and the level of finishes you choose.
As a general guide for a quality, custom-built granny flat in Perth:
- 1 Bedroom – From $130,000
- 2 Bedroom – From $165,000
- 3 Bedroom – From $210,000
Don't forget to budget for site works.
Depending on your property, you'll also need to allow approximately $20,000–$30,000 for items such as:
✅ Site survey & engineering
✅ Soil testing
✅ Earthworks
✅ Concrete slab
✅ Sewer, water & power connections
✅ Stormwater drainage
Every property is different, which is why there's no one-size-fits-all price.
More importantly... what are you actually buying?
When comparing quotes, make sure you're comparing like for like.
Some builders supply transportable or modular homes, while others build custom homes on-site.
At ANWEST Lifestyle, every granny flat is individually designed to suit your property and your goals. We build on-site using engineered BlueScope steel framing, creating a home that integrates with your existing property and is built for long-term durability.
Whether you're looking to:
✔ Create rental income
✔ House ageing parents or adult children
✔ Increase your property's functionality
✔ Add long-term value..we can help you understand what's possible on your block.
If you're thinking about building, we'd be happy to provide an obligation-free feasibility discussion.
📩 [email protected]
Because every great project starts with understanding what's possible.