Build vs Buy a House in Australia

The median house price in Sydney hit $1.6 million in early 2026. Melbourne sits around $1.05 million. Brisbane passed $900,000. At these numbers, the build-or-buy decision shapes your finances for the next 30 years. Each path carries different costs, timelines, and risks that most calculators ignore. This guide breaks down both options with real numbers.

The purchase price is the starting point, not the finish line. Stamp duty, legal fees, inspections, and loan costs add 5% to 7% on top for most buyers.

Stamp duty is the largest additional cost. In NSW, a $900,000 property attracts about $35,000 in stamp duty. Victoria charges approximately $49,000 on the same amount. Queensland charges about $31,000. First home buyers get concessions or exemptions in most states, but these thresholds vary. NSW exempts properties under $800,000 for first home buyers. Victoria exempts under $600,000.

On a $900,000 established house in Sydney with a 10% deposit, expect to pay around $55,000 to $70,000 in upfront costs (stamp duty, LMI, legal, inspections). This means you need $145,000 to $160,000 in cash before you move in.

Renovation costs catch new buyers off guard. Established homes come with wear. A kitchen renovation runs $15,000 to $45,000. A bathroom costs $10,000 to $30,000. If the property needs both within five years, add $25,000 to $75,000 to your total cost of ownership.

Building splits into two purchases: land and construction. You buy the land first (or find a house-and-land package), then engage a builder for the construction. Each stage has its own costs and timelines.

Land prices in growth corridors have surged. A 400-square-metre block in Sydney's outer west (Marsden Park, Oran Park) costs $550,000 to $700,000. In Melbourne's western suburbs (Rockbank, Melton South), expect $350,000 to $500,000. Brisbane's growth areas (Ripley Valley, Yarrabilba) sit around $300,000 to $450,000. Our guide to the best investment suburbs in Australia tracks which growth corridors show the strongest returns.

Construction costs in 2026 sit at $1,800 to $3,500 per square metre for a standard single-storey home. A 200-square-metre home (four bedrooms, two bathrooms) costs $360,000 to $700,000 to build, depending on finishes and location. Regional builds cost less per square metre. Custom architect-designed homes push past $4,000 per square metre.

A typical house-and-land package in Melbourne's west runs $650,000 to $850,000 total. In Sydney's outer suburbs, expect $900,000 to $1.2 million. These figures include land, base construction, and standard inclusions. Site costs, landscaping, and upgraded finishes add $30,000 to $100,000 on top.

Banks do not lend based on the price you agreed to pay. They lend based on their own valuation. A bank sends a licensed valuer (or uses an automated valuation model) to assess the property. If the bank values your property lower than the purchase price, your loan amount drops and you need more cash to cover the gap.

For established homes, the valuer compares recent sales of similar properties in the area. If you paid at the peak of an auction, the bank might value the property 5% to 10% below your purchase price. A $900,000 purchase valued at $850,000 means you need to find an extra $50,000, or accept a higher LVR with LMI.

For new builds, the bank values the completed property, not the sum of land and construction costs. In a rising market, the completed home is worth more than what you paid. In a flat or falling market, the bank may value it at less than your total spend. This risk is real. CoreLogic data shows that some growth corridor estates saw 5% to 8% value drops between 2022 and 2024 before recovering.

Construction loans add complexity. The bank releases funds in stages (called progress payments) as the builder completes each phase: slab, frame, lock-up, fixing, and completion. The bank revalues at each stage. If construction costs increase mid-build (common with material price changes), you may need to fund the difference from your own pocket.

Buying an established home: 6 to 12 weeks from offer to settlement. You attend the auction or make a private offer, exchange contracts, and settle six weeks later (standard in NSW and Victoria). You can move in on settlement day.

Building a new home: 10 to 18 months from contract signing to handover. Land settlement takes 6 to 12 weeks. Council approvals take 4 to 12 weeks. Construction takes 6 to 12 months for a standard project home. Weather delays, material shortages, and builder scheduling push many projects past 12 months.

During construction, you pay rent on your current home while also paying interest on the drawn-down portion of your construction loan. A 12-month build with $300,000 drawn on average at 6.5% interest costs about $19,500 in interest alone. Add $25,000 to $35,000 in rent, and the holding costs reach $45,000 to $55,000. Buyers of established homes avoid this double payment.

The First Home Owner Grant (FHOG) in most states applies to new builds, not established homes. NSW offers $10,000 for new homes under $750,000. Victoria offers $10,000 for new homes under $750,000 (or $20,000 in regional Victoria). Queensland offers $30,000 for new homes under $750,000. This is a significant financial incentive to build.

The First Home Guarantee (formerly First Home Loan Deposit Scheme) lets eligible buyers purchase with a 5% deposit and no LMI. The government guarantees the remaining 15%. This applies to both new and established homes, with price caps that vary by location. Sydney's cap is $900,000. Melbourne's is $800,000.

Stamp duty concessions favour new builds in some states. In Victoria, off-the-plan purchases attract a stamp duty reduction because you pay duty on the land value, not the completed value. In NSW, first home buyers pay zero stamp duty on new or established homes under $800,000.

Buying suits people who want to live in established suburbs with schools, shops, and transport within walking distance. Building suits people who want a brand-new home designed to their specifications and who can absorb the longer timeline and holding costs. If you plan to rent the property out, understand property management fees before you commit to an investment purchase.

Run the numbers for your situation. A $800,000 house-and-land package with the $30,000 Queensland FHOG and lower stamp duty might cost less overall than a $750,000 established home in the same area after stamp duty and renovation costs. But if you factor in 12 months of rent and construction loan interest, the gap narrows or disappears.

Talk to a mortgage broker who handles both construction loans and standard home loans. They can model both scenarios with your deposit, income, and target location. Some investors skip the purchase entirely and manage rental properties without an agent to cut ongoing costs.

Between 2022 and 2025, hundreds of Australian builders entered administration or liquidation. Porter Davis, Metricon (restructured), Privium, Oracle Homes, and dozens of smaller operators left homeowners with half-built houses and deposits lost. The ASIC insolvency statistics show construction as the single largest sector for company failures.

Every state requires residential builders to carry home building insurance (called Home Building Compensation in NSW, Domestic Building Insurance in Victoria). This covers you if the builder dies, disappears, or becomes insolvent during construction or within six years after completion. The maximum cover varies: $340,000 in NSW, $300,000 in Victoria, $200,000 in Queensland. Confirm your builder holds valid insurance before you sign any contract. Ask for the certificate number and verify it with the insurer. You can also explore what home insurance covers (including termite damage) to protect your new build after handover.

Fixed-price contracts protect you from cost blowouts during construction, but read the fine print. Most fixed-price contracts include a "rise and fall" clause that lets the builder pass on material cost increases above a certain threshold. Some builders cap this at 5%. Others leave it open-ended. Ask your solicitor to review the contract before you sign.