Most buyers walk through a property focusing on finishes, like fresh paint, modern kitchens, and styling.
But experienced buyers know the real risks (and costs) are often hidden in plain sight.
If you’re purchasing property in NSW, understanding what to look for during an inspection can help you avoid unexpected expenses and put you in a stronger position to negotiate before exchange.
Below are some of the most common (and costly) issues we see buyers overlook.
- Hot Water System Age and Condition
Start with the hot water system. Check the compliance plate for the installation date.
Most systems last around 8–12 years. If it’s nearing the end of its lifespan, replacement may be required sooner rather than later.
Typical replacement cost: $1,500–$5,000+ (depending on system type and installation)
What to do:
If the system is older, factor this into your budget or raise it during negotiations.
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- Electrical Switchboard and Safety Switches
Take a look at the electrical switchboard. Older homes may still have ceramic fuses or lack safety switches (RCDs), which are now standard for safety compliance.
Typical upgrade cost: $900-$4,500
Complex upgrades: Up to $8,000+
Why it matters:
Outdated electrical systems can present safety risks and may need upgrading to meet current standards. Some insurers may also require this.
- Ceiling Stains and Signs of Water Damage
Look up. Discoloured patches or stains on ceilings can indicate past or ongoing water ingress.
This could be due to roof leaks, blocked gutters, or plumbing issues.
Potential repair costs: Repair costs vary significantly depending on the cause and extent of the damage, ranging from minor repairs to major structural work.
What to do:
Ask when the issue occurred and whether it has been properly repaired. Supporting documentation is important.
- Air Conditioning Systems
Check the age and condition of any air conditioning systems, whether split systems or ducted.
Most systems last around 10–15 years.
Replacement cost: Prices may significantly vary based on the system type and age.
What to do:
If the system is older, you may need to budget for replacement in the near future.
- Windows and Seals
Older properties often have single-glazed windows or worn seals.
Signs to look for include drafts, noise penetration, or condensation between panes.
Cost considerations: Costs will depend on the number of windows, materials, and glazing type, with full replacements often representing a significant investment.
Why it matters:
Poor windows affect energy efficiency and comfort. Upgrades can be expensive.
- Cracks in Walls or Brickwork
Not all cracks are equal.
- Hairline cracks are generally cosmetic
- Wider cracks, horizontal cracks, or stair-step patterns in brickwork may indicate structural movement
Potential repair costs: Structural repairs can vary widely depending on severity and should be assessed by a qualified professional.
What to do:
If you’re unsure, a building inspection is essential to assess the severity.
- Plumbing and Sewer Lines
Older homes may have clay or galvanised pipes, which deteriorate over time.
Issues with sewer lines are not always visible during a standard inspection.
Potential costs: Costs vary depending on the location and extent of the issue, particularly in older properties with ageing infrastructure.
What to do:
Consider a sewer inspection for older properties to identify hidden issues early.
- Water Pressure
As a simple test, turn on multiple taps or flush a toilet while running the shower.
Low water pressure can indicate underlying plumbing issues.
Replumbing cost: Rectification costs vary depending on the underlying cause, including potential pipe replacement in some cases.
- Drainage and Site Grading
Walk around the exterior of the property.
The ground should slope away from the home. If water drains towards the property, it can lead to rising damp or internal water damage.
Drainage fixes: Drainage works can range from minor adjustments to more extensive excavation and waterproofing solutions.
Why These Checks Matter Before You Exchange Contracts
In NSW, once contracts are binding (either the cooling off period has expired or exchanged unconditionally), you are committed to the purchase the property in its present condition and state of repair.
That means issues identified after exchange can quickly become your responsibility.
Carrying out proper due diligence beforehand, including building and pest inspections, can help you:
- Identify potential risks
- Budget accurately for repairs
- Negotiate the purchase price or request rectification
- Avoid costly surprises after settlement
Practical Next Steps for Buyers
If you are considering purchasing a property, it is worth taking a structured approach:
- Arrange a building and pest inspection before exchange
- Ask questions and request supporting documents for any visible issues
- Consider additional inspections (such as plumbing or sewer checks) where relevant
- Have a solicitor or conveyancer review the contract before signing
Final Thoughts
The cosmetic features of a property are easy to see.
The issues that cost the most are often less obvious, but far more important.
Taking the time to identify these risks early can make a significant difference, both financially and in your overall peace of mind.
Need Assistance Reviewing a Contract?
If you are purchasing property in NSW, obtaining legal advice before you sign a contract can help you make informed decisions and avoid unnecessary risk.
Joseph Grassi + Associates assists clients with property purchases, contract reviews, and conveyancing across NSW.
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DISCLAIMER: The cost estimates referred to in this article are indicative only and provided for general informational purposes. Actual costs may vary significantly depending on the property, location, materials, and extent of any issue identified. You should obtain independent quotes and professional advice specific to your circumstances before relying on any estimates.
