Find out what you can build — and what it’ll cost
Enter your address to check zoning, overlays, and approval pathways — then get a cost estimate based on published market data.
We don’t build granny flats!
We’re an independent resource helping buyers and builders navigate zoning, approvals, costs, and everything in between.
- Cost data sourced quarterly from published prices
- Planning rules cited to official government sources
What can you build on your property?
Enter your address and we'll check your zoning, overlays, and what's possible on your block.
We use your address to check council zoning and planning rules — not stored until you choose to continue.
Build types
Explore by build type
Each type has different costs, timelines, and trade-offs. Start with the one that fits your situation.
Studio
Compact self-contained studios under 40m² — ideal for singles or couples.
1-Bedroom
One-bedroom designs with separate living, kitchen, and bathroom.
2-Bedroom
Two-bedroom layouts for families, carers, or rental income.
Kit
Prefabricated kits for owner-builder or builder-assembled projects.
Modular
Factory-built modules transported and assembled on site.
Transportable
Pre-built units delivered whole to your site — fast turnaround.
Custom
Architect-designed builds tailored to your site and requirements.
Need help with the process?
How it works
Here's what you get — before you speak to anyone
Enter your address and see your zoning, approval pathway, and cost estimate — no sign-up required.
What's the property address?
42 Wattle Street, North Sydney NSW 2060
42 Wattle Street, North Ryde NSW 2113
42 Wattle Street, Northmead NSW 2152
Why trust us
We research the industry so you don’t have to
GrannyFlatGuide is an independent research platform, not a builder. No builder pays to be listed or ranked — we publish what we find.
Your details are never shared without your permission — you’re always in control.
How we assess and source informationBuild types covered
7
Studio, 1-bed, 2-bed, kit, modular, transportable, custom
Cost data reviewed
Quarterly
All pricing ranges are dated and sourced
Builder affiliation
None
Independent — not owned by any builder or manufacturer
Explore Australian granny flat builders
Our public directory — profiles, service areas, and reviews. Not ranked or endorsed.
Out-Back Portable Buildings
★ 5.0 (25 reviews)
Custom-made, pre-fabricated transportable homes including granny flats, offices, and portable buildings.
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Design Science
★ 5.0 (4 reviews)
Licensed builder and building designer on Gold Coast offering custom homes, renovations, and extensions.
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Adams Cabins
★ 5.0 (20 reviews)
Family-owned cabin builders specializing in log cabins, granny flats, and tiny homes in SE Queensland.
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Neo Living
★ 5.0 (5 reviews)
Modular prefab homes and granny flats specialist on Gold Coast. QBCC-licensed builder offering Class 1A certified homes.
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Wilson Design & Build
★ 5.0 (15 reviews)
We Design and Build new homes, granny flats, extensions and dual key investments all through Logan, Redlands, Brisbane, Ipswich and the Gold Coast.
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Garden Studios
★ 5.0 (63 reviews)
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Mamet Homes
★ 5.0 (9 reviews)
Brisbane custom home builders offering fixed-price contracts and guaranteed timelines for granny flats and new builds.
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Perway Ecopods
★ 5.0 (43 reviews)
Perth-based home renovation and construction company offering custom builds with transparent service.
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GrannyFlatGuide is a comparison platform. Builders shown are randomised on each visit and not ranked or endorsed. Listing does not imply endorsement. GrannyFlatGuide may receive a referral fee when you request quotes.
Cost guides
What it actually costs
Sourced cost ranges with methodology notes — not builder estimates.
Cost guide
Studio Granny Flat Cost Guide
Build cost ranges for compact self-contained studios under 40m².
Published builder pricing, Q1 2026
Cost guide
1-Bedroom Granny Flat Cost Guide
Cost ranges for one-bedroom granny flats with separate living areas.
Published builder pricing, Q1 2026
Cost guide
2-Bedroom Granny Flat Cost Guide
Cost ranges for two-bedroom granny flats — families, carers, or rental.
Published builder pricing (GFS, Backyard Grannys, Master GF), Q1 2026
Get inspired
Find your style
Explore granny flat options by size or architectural style.
Guides
Answers to the questions buyers ask most
Practical guides sourced from government planning documents, not builder marketing.
Guide
Granny Flat Council Approval
When development approval is required, when complying development works, and how to find out.
Guide
How to Plan a Granny Flat
From site assessment to builder selection — the steps involved in a granny flat project.
Guide
Kit vs Custom Granny Flat
Cost, timeline, and quality differences between kit builds and custom designs.
See what’s possible on your block
Enter your address, get your zoning and cost estimate, and connect with builders — free, no obligation.
Join 1,000+ Australians who've used GrannyFlatGuide to research their granny flat project
Check your property