Melbourne has no shortage of people advertising granny flat builds. A quick search surfaces dozens of options at a wide range of price points, all positioning themselves as the obvious choice for your block.
The problem is that granny flat builders Melbourne homeowners encounter vary enormously in quality, compliance knowledge and honesty about what their price actually includes. Choosing the wrong builder can leave you with an unpermitted structure, a cost blowout or defects with no warranty behind them.
This guide covers the seven things every Melbourne homeowner should check before signing with any granny flat builder.
1. VBA Registration
Any builder carrying out domestic building work in Victoria must be registered with the Victorian Building Authority. An unregistered builder cannot legally carry out the work, cannot provide statutory warranties under the Domestic Building Contracts Act 1995 (Vic) and leaves you with no recourse if something goes wrong.
Verify any builder’s VBA registration at vba.vic.gov.au before any other conversation. It takes two minutes and is the most important check you will make.
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2. A Fixed-Price Contract
Some granny flat builders Melbourne homeowners encounter quote a low headline number and then apply variations and provisional sums throughout the build. Before signing, ask directly: is this a fixed-price contract? What is excluded? What triggers a variation?
Every Innovista G-Flat™ is delivered on a fixed-price turnkey contract. The price includes the building permit, plans and design, connection of services up to 10 metres and the complete build to handover. Our granny flat cost Melbourne 2026 guide covers exactly what is and is not included.
All prices are indicative only and may vary based on site conditions, design selections and council requirements. Always request a current written quote.
3. A Genuine Structural Warranty
Ask any builder: what is your structural warranty period, what does it cover and what is the claims process?
Innovista backs every G-Flat™ with a 10-year structural warranty covering foundations, frame, roof structure and load-bearing elements, plus a 6-month maintenance guarantee. Both are provided in writing as part of the building contract.
4. Full Permit Management
A secondary dwelling in Victoria requires a building permit at minimum. Some properties also require a planning permit depending on the zone and overlays. Ask any builder whether they manage the full permit process or hand planning complications back to you.
Innovista manages the building permit process as part of every G-Flat™ contract. For properties with heritage overlays or flood zones, our team guides you through the additional steps rather than leaving you to manage them alone.
5. A Proper Site Assessment Before Any Quote
A reputable builder will not give you a firm price without visiting your property. Soil conditions, slope, access, service distances and overlays all affect cost and feasibility. A quote produced without a site assessment is not a reliable price.
Innovista’s free site assessment visits your property in person, checks your block against planning parameters and recommends the right G-Flat™ floor plan for your situation.
6. A Range of Floor Plans
A builder with a single standard floor plan will try to make it work regardless of whether it suits your block. Innovista builds five G-Flat™ floor plans for different Melbourne block types. The Stella for corner blocks. The Aurora for narrow and side-access blocks. The Lana for standard suburban backyards. The Lana 2 for households needing two bathrooms. The Sirius for wider open blocks.
All five are available across four finish levels — Affordable, Homestead, Signature and Luxe. Full images, dimensions and inclusions are on our G-Flat™ page.
7. What Real Customers Say
Credentials tell you what a builder says about themselves. Reviews tell you what the experience is actually like. Read verified reviews on Google and ProductReview and look for consistent patterns around communication, timeline reliability and post-handover support.
You can read what real Innovista customers say on our reviews page before making any decision.
Frequently Asked Questions
Should I get multiple quotes from granny flat builders in Melbourne?
Yes. When comparing, make sure you are comparing the same scope. A quote excluding the building permit, engineering or service connections will look cheaper but will not be once those costs are added.
What does a granny flat builder cost in Melbourne in 2026?
A fully compliant turnkey two bedroom secondary dwelling from a reputable VBA-registered builder typically starts at approximately $198,000 at entry level. Lower quotes that appear significantly cheaper typically exclude the permit, foundation or fit-out.
How do I know if a granny flat builder is trustworthy?
VBA registration, a written fixed-price contract, a structural warranty in writing, full permit management included and independently verified customer reviews are the most reliable indicators.
Can I see a finished G-Flat™ before choosing Innovista?
Yes. Innovista has display homes in Melbourne where you can inspect finished G-Flat™ builds before committing. Visit our display homes page to arrange a visit.
How many granny flat builders are there in Melbourne?
Dozens, ranging from specialist secondary dwelling companies to general builders who take on these projects occasionally. VBA registration, fixed-price contracts and independent reviews are the most reliable filters.
The Next Step
Finding the right granny flat builder in Melbourne starts with a site assessment. Innovista offers a free site visit where our team assesses your block and provides a fixed-price quote with no obligation to proceed.
Book your free site assessment here or contact us to start the conversation.