10 Common Home Buying Mistakes — And What to Do Instead
Property buying mistakes are rarely made from ignorance — they are made from excitement, time pressure, and underestimation. Each of the mistakes below has a specific, practical alternative. Not just warnings — concrete next steps with tools to act on them.
Mistakes that hit during the search phase
What goes wrong: Buyers focus on saving the deposit and are caught short at settlement when stamp duty, legal fees, inspections, and moving costs are due — cash they don't have.
Run the Total Upfront Cost Calculator and confirm you have enough cash for deposit + stamp duty + legal + inspection + moving. Don't rely on "deposit + 5%" as a rule of thumb.
What goes wrong: Maximum borrowing capacity assumes today's income and today's rates. A rate increase of 1–2% can push repayments from manageable to genuinely strained. Council rates, insurance, and maintenance pile on top.
Run the Ongoing Ownership Cost Calculator. Verify that mortgage + rates + insurance + maintenance as a percentage of take-home pay is under 35% — not just the mortgage alone.
What goes wrong: Buyers skip inspections to save $500 or to make an offer more competitive — and discover structural movement, active termites, or waterproofing failure after exchange. These become the buyer's financial problem.
Commission your own building and pest inspection from a licensed inspector ($400–$700) before making your offer or as a condition of your offer. Do not rely on the vendor's report. See the Building and Pest Inspection Guide.
What goes wrong: Buyers fall in love with a property and revise their walk-away price upward on the day of the auction or negotiation — spending $30,000–$80,000 more than planned, often in the heat of competition.
Complete the Offer Planning Worksheet before attending any negotiation or auction. Write your walk-away price down. Tell your support person. Do not revise it upward on the day.
What goes wrong: Buyers calculate affordability at the current interest rate and do not model what happens if rates rise by 1–2%. Since 2022, this scenario became reality for hundreds of thousands of borrowers.
Run the Mortgage Repayment Calculator at your current rate + 2%. If that number breaks your budget, the purchase price is too high.
Mistakes that hit at offer and exchange
What goes wrong: Buyers treat stamp duty as an afterthought and discover at settlement that they need $20,000–$50,000 in cash they haven't fully set aside. Stamp duty cannot be added to the home loan in most cases.
Use the Stamp Duty Calculator early in the planning process. The cash must be available at settlement — include it in your upfront savings target from day one.
What goes wrong: A property 30km further from work looks like a $300,000 saving. But $6,000–$9,000 per year in additional commute costs over 10 years is $60,000–$90,000 — significantly eroding the price advantage.
Calculate the full annual commute cost using the Commute Cost Calculator before comparing properties in different locations. Include it in your total cost of ownership model.
What goes wrong: Buyers purchase an apartment without reviewing strata financials and discover a building with a depleted sinking fund, a $50,000 special levy pending, or ongoing disputes between owners.
Request the strata financial statements and last 2 years of meeting minutes before any apartment purchase. Check the sinking fund balance against the 10-year capital works plan.
What goes wrong: Buyers attend auctions or make private treaty offers based on an online borrowing estimate — not a formal pre-approval. If finance is not confirmed, they may win the auction and then fail to obtain a loan.
Get formal pre-approval — not just an online estimate — before attending auctions or making private treaty offers. Pre-approval takes 1–2 weeks and gives you a verified borrowing limit.
What goes wrong: Buyers take the vendor's agent's advice on offer strategy, price guidance, and competing interest as impartial — when the agent's legal duty is to the vendor and their fee depends on the sale price.
The vendor's agent is paid by the vendor and acts in the vendor's interest. Use them as an information source, not as an advisor. Your conveyancer — and potentially a buyer's agent — work for you.
The common thread
The most common thread across all these mistakes is insufficient preparation time. Buyers who spend 2–3 months doing financial and legal preparation before actively searching make far fewer of these mistakes than buyers who find a property they love and then rush to buy it.
Preparation time is not wasted time — it is the period when you build the financial literacy and the tools to buy well, not just to buy quickly.