Australia’s independent granny flat research hub

Your Independent Guide to Granny Flats & Tiny Homes

Honest cost breakdowns, pro and con supplier reviews and council approval advice. No sales pitch, just the research you need before you build.

100% independent Updated June 2026 No sales pressure

3Build Paths

6States Covered

$0Cost to You

2026Cost Data

We cover Prefab & modular DIY kits Custom builds Council approval Real costs

Start here

What’s Your Project Goal?

Pick the path that matches how you want to build. Each one links to a vetted directory and the research behind it.

Prefab & Modular Homes

Factory-built and craned to site for speed and cost certainty. Compare Australia’s leading providers.

Browse prefab providers

DIY Kits

The owner-builder route. Save the builder’s margin by assembling a supplied steel or timber kit yourself.

Compare kit suppliers

Custom Home Builders

A licensed local builder manages a fully bespoke design. Find vetted builders in your state.

Find custom builders

Guides & Costs

Still weighing it up? Start with our cost breakdowns, council approval guides and design ideas.

Read the guides

Why we exist

A Trusted, Independent Resource, Not a Sales Funnel

Most granny flat websites are run by builders trying to sell you their product. We are different. We don’t sell kits and we don’t employ salespeople. The Granny Flat Guide is a research hub built to save you money and protect you from budget blowouts.

We give you the raw data: the real cost gap between prefab and custom, the fees that hide inside council approval, and balanced pro and con reviews of Australian suppliers.

Real cost bands. Current 2026 pricing across kit, prefab and custom builds, including the site costs most quotes leave out.
Balanced reviews. Every supplier write-up covers the strengths and the weaknesses, so you see the full picture.
State-specific rules. Plain-English guides to council approval, setbacks and the 60 sqm threshold that trips up so many projects.

What You’ll Find Here

We turn a confusing market into a clear set of decisions. Wherever you are in the process, there’s a starting point built for it.

For people still deciding

Cost guides, the prefab versus kit versus custom comparison, and design ideas to help you shape a realistic brief.

Free cost calculator covering all four budget phases
Council approval explained state by state
Curated supplier directories, listed for free

Don’t build blind

Get the Budget Right Before You Commit

Material costs and council fees shifted again in 2026. Our free feasibility calculator helps you avoid the surprises that derail backyard builds.

Estimate Site Costs

Excavation, the slab, crane access and sewer connection are the variables that quietly blow budgets. Plan for them up front.

Compare Kit vs Custom

See where a DIY kit really saves money once you account for trades and your own time, versus a managed custom build.

See Where the Money Goes

Break your budget into preliminaries, site costs, the build and finishes so you know what builders leave out of the headline price.

Open the free cost calculator

Already have a ballpark? Compare free quotes from vetted suppliers.

Why trust us

An Independent Voice in a Crowded Market

We exist to help you decide, not to sell you a product. Here is how our research stays honest.

Data Driven, Not Sales Driven

We aggregate supplier data from across Australia, track current council regulations (SEPP, ResCode) and break down material costs (steel versus timber) against National Construction Code standards.

Pro and Con Reviews

Every review weighs the strengths and the weaknesses of a product or builder, so you get the full story before you commit a cent.

Expert-Led Guides

Content is written and checked by people with hands-on experience in Australian construction, not generic AI writers.

Good to know

Granny Flat Questions, Answered

The questions Australian homeowners ask us most, before they spend a dollar.

How much does a granny flat cost in Australia in 2026?

Most finished 60 sqm granny flats land between $120,000 and $250,000 turnkey, depending on your state, site and finish level. As a rough rule, budget about $1,800 to $3,500 per square metre. A supply-only DIY kit can start near $30,000, but the move-in cost usually finishes two to three times higher once you add the slab, trades, council fees and fit-out. Use our free cost calculator to estimate your own numbers.

Do I need council approval to build a granny flat?

In most cases yes, but the pathway varies by state. In New South Wales a secondary dwelling under 60 sqm on a lot of at least 450 sqm can often be approved as Complying Development (CDC) without a full DA. Victoria, Queensland and Western Australia each set their own rules on size, setbacks and whether the flat can be rented. Always confirm the current requirements with your council before you commit.

Is it cheaper to build with a DIY kit?

A kit removes the builder margin, which can save roughly 20 to 30% on paper. The catch is that you take on project management, council approval, the slab, plumbing, electrical and the internal fit-out. It works well for organised owner-builders with time and a good network of trades, and far less well if you are time-poor.

Prefab, kit or custom: which path should I choose?

Prefab and modular builds are the fastest and give you the most price certainty, but less design freedom. A DIY kit is the lowest sticker price but asks the most effort. A custom builder gives you a fully bespoke result and manages the risk, at a higher cost and a longer timeline. Our supplier hub compares all three side by side.

GFResearched by The Granny Flat Guide Team, independent Australian construction researchers. We are not a builder and we do not sell kits. Guides and supplier data last reviewed June 2026.

Ready to Build? Check Supplier Availability

Finding a quality builder with capacity in 2026 isn’t easy. Tell us your project details and we’ll check availability with our network of vetted kit, prefab and custom suppliers in your area.

Check supplier availability

Prefer to research first? Read our in-depth guides or compare the three build paths.