Off-the-plan property: the risks every Australian buyer underestimates

Buyers who signed off-the-plan contracts in 2021 and 2022 spent the next two years watching the market move against them. By the time their towers topped out in 2024 and 2025, bank valuations were landing 5% to 15% below contract price in parts of inner Melbourne and south-east Queensland. The deposit was already locked. The shortfall came out of cash. That is the part of off-the-plan that the glossy display suite never mentions.

Off-the-plan can still be a sensible purchase. It just carries a different risk shape to buying an established home, and the risks compound the longer the build takes.

The settlement valuation gap

When you sign an off-the-plan contract, the bank does not lend against today's market. It lends against whatever the valuer says the property is worth on the day of settlement, which might be 18 to 36 months away. If the valuation comes in below the contract price, the lender funds against the lower number, and you cover the difference in cash on top of the agreed deposit.

Take a $750,000 apartment bought off-the-plan with a 10% deposit, so $75,000 paid at exchange. The buyer planned an 80% loan ($600,000) and $75,000 of additional cash at settlement. Two and a half years later, the building completes and the bank valuer assesses the unit at $690,000. The lender will fund 80% of $690,000, which is $552,000. The buyer still owes the developer $675,000 (the contract price less the deposit already paid). The cash gap at settlement jumps from $75,000 to $123,000. That extra $48,000 is the valuation gap, and it is the single most common reason off-the-plan settlements blow up.

Sunset clauses and who actually controls them

Every off-the-plan contract carries a sunset date: the deadline by which the development must reach a defined milestone, usually registration of the strata plan. If the project misses that date, the contract can be terminated and the deposit returned. On paper that protects the buyer. In a rising market it has repeatedly worked the other way.

Developers who saw prices climb during construction sometimes engineered delays so they could trigger their own sunset clauses, hand back the original deposit, and resell the same apartment at a higher price. NSW closed that loophole in 2018: a developer can no longer rescind under a sunset clause without either the buyer's written consent or a Supreme Court order. Victoria followed with similar reforms. Queensland, Western Australia, and the smaller jurisdictions have a patchier record. Read the sunset clause, check whether your state requires consent for a developer-led rescission, and ask your conveyancer to flag any clause that lets the developer extend the date unilaterally.

Your finance approval expires before you settle

Pre-approval at the time you sign the contract is usually valid for three to six months. Settlement on an off-the-plan purchase commonly lands 18 to 36 months later. Everything that drives serviceability can move in between: cash rate, your income, the APRA assessment buffer, lender policy on apartments under a certain size, even the bank's appetite for the postcode if a glut of new stock comes online.

A buyer who comfortably qualified for a $600,000 loan in 2022 at a 4.5% assessment rate can find themselves $90,000 short in 2024 once the assessed rate sits above 9%. The remedy is to re-run your borrowing capacity well before settlement, not the week the certificate of occupancy lands. Use the borrowing power calculator on a quarterly basis through the build, with a buffer for rate rises, and treat any narrowing of the gap as a prompt to talk to your broker rather than wait.

Build quality, design changes, and what you can refuse

Most off-the-plan contracts give the developer a right to make "minor" amendments to finishes, layout, and inclusions. The definition of minor is the developer's, within limits set by state legislation. Buyers who expected engineered timber floors have settled into vinyl plank. Buyers who paid for ducted air conditioning have inherited split systems on the balcony. None of those substitutions usually rises to the threshold of material variation that lets you walk.

The bigger structural risk is defect. The combustible cladding scandal that surfaced after Lacrosse and Grenfell, and the Opal Tower and Mascot Towers evacuations in NSW, all hit owners who had completed off-the-plan settlements years earlier. Building bonds, decennial insurance schemes, and the NSW Building Commissioner's expanded powers post-2020 have shifted the picture. They have not eliminated it. Independent pre-settlement inspections are cheap insurance, and refusing to settle on a unit with documented defects is easier than chasing rectification afterwards.

Stamp duty timing depends on your state

Stamp duty on off-the-plan contracts is one of the few areas where the rules differ sharply between states, and the cash-flow consequences are real. In NSW, an eligible owner-occupier buying off-the-plan can defer payment of transfer duty for up to 12 months from the contract date or until completion, whichever is earlier. That defers tens of thousands of dollars to a point where you also need a deposit top-up, which is worth modelling rather than welcoming.

Victoria and Queensland generally assess duty against a value closer to land plus construction-to-date at contract, which can substantially reduce the duty bill on a true off-the-plan purchase but creates its own audit trail at settlement. The rules are state-specific, change often, and interact with first-home concessions differently in each jurisdiction. The NSW vs VIC stamp duty comparison walks through how the two regimes price the same purchase differently, and the same comparison applies in spirit when you layer in off-the-plan timing.

The upside, honestly stated

Off-the-plan does carry genuine advantages. A long settlement gives you more time to save, and any capital growth during the build accrues to you rather than the vendor. New buildings attract higher tax depreciation deductions than established stock, and Division 40 plant-and-equipment claims on a brand-new kitchen and HVAC fit-out can add several thousand dollars a year of deductions for an investor. First-home buyer concessions are often more generous on new builds, particularly in jurisdictions trying to stimulate housing supply.

Those upsides are real. They are also conditional on the building actually completing, on the valuation holding up, and on your finance still working. Treat off-the-plan as an option on a future property, not a guaranteed entry at today's price. Run the same diligence you would on an established purchase, then add a 10% buffer for the valuation gap, a re-check of borrowing capacity every quarter, and a careful read of the sunset clause before you sign. The first-home buyer guide covers the broader cost-of-purchase stack that off-the-plan sits on top of.

Burbfindercan't tell you whether a specific tower will deliver on time, on spec, and on price. Nobody can. What you can do is sign a contract whose worst-case outcome you have already costed.