Rental income
WA rules let you rent it to anyone, not just family.
Block check
Can my block fit one?
Four quick answers. We'll sketch it.
Your answer appears here
Enter your block size and backyard space.
Indicative, not planning advice. Based on WA's R-Codes (Volume 1, 2024) as summarised by the WA Government. Your council's scheme, setbacks, easements, sewer and heritage status decide the final answer.
Typical costs
What will it cost?
Turnkey, PerthTypical range
Studio$66k–101k
1-bed$105k–152k
2-bed$133k–200k
Typical range
Get a real quote
$105,000 – $129,000
1-bed, standard finish, turnkey
A ballpark, not a quote. Source: whatsthedamage.com.au Perth guide (July 2026); studio estimated from its $2,200–$3,350/m² rate. Tricky sites, retaining and sewer work can add more.
Why build one
More from the land you own.
Family close by
Parents, grown-up kids, guests. Close, but their own front door.
Room to grow
A second home on one title. It stays part of your property.
How it works
Three steps. No pressure.
- 01
Tell us about your block
Size, space, timing. Photos help.
- 02
A specialist calls you
A Perth granny flat builder or building broker we select talks through designs, costs and timing for your block.
- 03
You decide
Free, no obligation. Go ahead only if it suits.
From sandy backyard to front door.
Start with a two-minute enquiry.
Questions
Short answers.
How much does a granny flat cost in Perth?
Perth cost guides put a turnkey 1-bedroom at about $105,000–$152,000 and a 2-bedroom at about $133,000–$200,000 (whatsthedamage.com.au, July 2026). Site costs, finishes and access move the number. A specialist can price your actual block.
Do I need council approval?
Since April 2024, a granny flat up to 70 m² that meets all the R-Codes deemed-to-comply rules (setbacks, open space, height, privacy and so on) doesn't need planning approval in WA. Heritage-listed properties and rural zones are different. You still need a building permit from your council. Check with your council before you commit.
Can I rent it out?
Yes. The WA Government says anyone can live in one: family, a friend, or a tenant. It stays part of your property, so it generally can't be sold separately.
How long does it take?
It depends on the design, the builder's schedule and your building permit. The specialist can give you realistic timing for your block before you sign anything.
How do I pay for it?
We don't arrange or advise on finance. If you need a loan, talk to a qualified finance broker or your lender about your options.
What's a dual-key home?
Two self-contained homes under one roof, usually as a new build. Planning rules can differ from a granny flat, so ask the specialist what your block allows.
Who are you? Is this free?
It's free. Granny Flat Check is a free service that connects Perth homeowners with one Perth granny flat builder or building broker we select. We're not a builder and we don't do building work. We may receive a referral fee from the business we introduce you to.
Free enquiry
Talk to a granny flat specialist.
Your details go to one Perth granny flat builder or building broker we select. Nobody else.
- One business, never a list or call centre
- Free, no obligation
- About two minutes
Get a free quote
Step 1 of 4
Enquiry received
Thanks. You're on the list.
A Perth specialist will be in touch, usually within two business days. Nothing else to do for now.
Shared with one business only. Never sold. Free, no obligation. We may receive a referral fee.