Due diligence is the unglamorous part of buying property, but it’s also where costly mistakes get caught before they become your problem. Whether you’re buying at auction or via private treaty, running through a proper checklist before you commit protects you from surprises that surface after settlement, when it’s too late to renegotiate.
Building and Pest Inspection
A licensed building inspector should assess structural issues, moisture problems, roofing, and general condition, while a separate (or combined) pest inspection checks for termite activity and damage — a genuine risk in many Sydney suburbs given the climate. Read the full report, not just the summary; a “minor” issue noted on page 12 can sometimes be an expensive one once you get quotes to fix it.
Strata Report (for Units and Townhouses)
If you’re buying into a strata scheme, order a strata report covering at least the last 12–24 months of minutes. Look specifically for: upcoming or ongoing special levies, the balance of the capital works and admin funds, any building defect claims or disputes, and the overall tone of owners’ corporation meetings. A healthy sinking fund and clean minutes are a good sign; frequent special levies or unresolved defect disputes are a red flag worth pricing into your offer or walking away from entirely.
Contract Review
Have a solicitor or licensed conveyancer review the contract of sale before you exchange — not after. They’ll check the title for easements, covenants, or caveats, confirm zoning matches your intended use, review any special conditions the vendor has added, and flag anything unusual in the planning certificate attached to the contract.
Finance Pre-Approval
Get finance pre-approval (ideally close to formal/unconditional approval, not just an indicative pre-qualification) before you start making offers or bidding. This tells you your genuine borrowing capacity and speeds up the path to unconditional approval once you’ve found a property — particularly important if you’re buying at auction, where there’s no finance clause to fall back on.
Local Council and Zoning Checks
Check the property’s zoning and any development applications lodged nearby — a planned high-density development next door, a road-widening proposal, or a rezoning change can materially affect both liveability and future value. Most NSW council planning portals allow you to search development applications by address.
Flood, Bushfire, and Other Overlay Checks
Sydney has genuine flood-prone and bushfire-prone pockets, and these overlays affect both insurance costs and, in some cases, what you’re permitted to build. Planning certificates typically flag these, but it’s worth checking directly with the relevant council as well.
Putting It All Together
Running through each of these checks takes time and, in some cases, out-of-pocket cost before you even know if your offer will be accepted — which is exactly why some buyers skip steps under time pressure. Building a simple checklist and working through it methodically for every serious property, rather than only the one you’re about to make an offer on, keeps the process consistent and reduces the chance of missing something under pressure. If you’d rather have a professional manage this process end-to-end alongside the negotiation itself, buyers agents such as Alcove combine property due diligence coordination with the broader buying engagement.
For more on what happens once you’ve cleared due diligence and are ready to negotiate, see our guide on negotiating off-market property deals.
Frequently Asked Questions
How much should I budget for due diligence costs before making an offer?
Building and pest inspections, strata report fees, and initial legal review typically run to several hundred dollars combined — a genuine cost, but small relative to the risk of skipping these checks on a purchase this size.
Can I use the same building inspector for multiple properties I’m considering?
Yes, and it’s often a good approach — a consistent inspector gets a feel for your risk tolerance and can help you compare issues across properties more consistently.
What if the strata report reveals a special levy is likely but not yet confirmed?
Factor it into your offer or negotiation, and ask your solicitor whether a special condition can be added to the contract addressing responsibility for any levy raised after exchange but before settlement.
Key Takeaway
None of these checks are optional extras — each one exists because buyers before you have been caught out skipping it. Building the habit of running the full checklist on every serious property, not just your eventual favourite, is what keeps due diligence consistent under the time pressure of a live campaign.