Can I Build a Granny Flat Without Subdividing My Land in NSW?

The Short Answer

Yes — you can build a granny flat on your backyard land without subdividing it, and in New South Wales, the planning pathway to do so is more accessible than most homeowners realise.

The confusion arises because many people assume that getting paid for a portion of their land requires first splitting that land off and selling it — which often isn't possible due to lot size minimums, frontage requirements, or the sheer cost of the subdivision process. But subdivision is not the only path.

What NSW Planning Law Says About Granny Flats

Under the NSW State Environmental Planning Policy (SEPP) Housing 2021, secondary dwellings — commonly called granny flats — are permitted as complying development on standard residential lots in most zones across New South Wales. This means that if your property meets certain criteria, you can build a secondary dwelling without going through a full Development Application (DA) process.

The general criteria for complying development in NSW include:

• Lot size: The principal property must be at least 450sqm
• Size of the dwelling: The secondary dwelling must not exceed 60sqm of floor area under the complying development pathway (or larger in some cases under a DA)
• Setbacks: The dwelling must meet prescribed setbacks from side and rear boundaries
• Height: Maximum height of 8.5 metres, or lower depending on zone

These are general rules. Your specific lot, zone, and council area will determine exactly what applies to your property. That's why a proper property assessment — which Buy My Backyard provides free of charge — is always the right first step.

The Difference Between Subdividing and a Land Lease

When you subdivide land, you are splitting your property title and either selling the new lot or transferring ownership of it. Subdivision requires council approval, extensive surveys, infrastructure contributions, and in many cases creates costs of $60,000–$100,000 before any dwelling is built.

A 99-year land lease is a fundamentally different structure. The land is not split. Your title does not change. Instead, a registered lease gives Buy My Backyard the right to use a defined portion of your backyard for 99 years, in exchange for a one-off lump sum paid to you up front. Buy My Backyard then funds, builds, owns and manages the granny flat on that portion for the lease term. You remain the landowner throughout.

This structure means that:

• No council approval is required to "subdivide" your property
• Your title does not change, though we recommend disclosing the lease to your lender — their consent may be required
• You keep title to your whole property, including the leased portion
• You're paid a lump sum without selling any land, and you pay nothing toward design, approvals or build

What Would I Be Paid?

There's no single figure. What Buy My Backyard can offer for a lease depends on your property — its location, lot size and shape, zone, council controls, and how much of the backyard is suitable for a secondary dwelling.

The free assessment tells you whether your property qualifies and, if it does, what we would pay for the lease. There's no obligation to accept.

A few things are fixed regardless of the amount:

• The lump sum is paid once, and it's yours outright
• You pay nothing for the assessment, design, approvals or build
• Buy My Backyard finds and manages tenants and keeps the rent — you are not a landlord and carry no vacancy or maintenance risk

The Process in NSW

For most standard residential lots in NSW, the Buy My Backyard process follows this pathway:

1. Free property assessment — your lot is assessed against current NSW SEPP Housing 2021 criteria and your council's local planning controls
2. Your offer — if you qualify, we tell you what we'll pay for the lease, with no obligation
3. Lease signed and you're paid — a 99-year lease over the agreed portion is prepared and executed (independent legal advice is encouraged), and the lump sum is paid to you
4. Design and CDC — a complying design is prepared and a Complying Development Certificate is lodged with a private certifier (typically approved in 2–6 weeks), all at our cost
5. Build managed — construction is managed end-to-end by us, including all council inspections
6. We manage it for 99 years — we look after the dwelling and tenants; you keep your home, your title and the money

Is My Backyard Big Enough?

The most common concern we hear from NSW homeowners is that their backyard is too small. In our experience, many properties that homeowners assume won't qualify actually do — particularly on standard 500–700sqm lots in established suburbs where the backyard has never been built on.

The only way to know for certain is a property-specific assessment. Submit your property details through our free assessment form and we'll review your specific lot — at no cost and with no obligation to proceed.

This article provides general information about secondary dwelling planning in NSW. Planning rules change and vary by council area. Always confirm current requirements with a licensed certifier or planner for your specific property.