Buying a property is an exciting milestone — but before you sign the dotted line, a pre-purchase building and pest inspection can save you from unexpected (and expensive) surprises. These inspections reveal issues that might not be obvious during a casual walk-through.
Here are 10 common red flags uncovered during property inspections — and why you shouldn’t ignore them.
1. 🐜 Termite Damage
Termites are often called “silent destroyers” because they can chew through timber unnoticed. A home may look fine on the surface, but an inspection might reveal soft or hollow-sounding wood, mud tubes, or even active termite nests.
Why it matters: Termite damage can compromise the structure and cost thousands to repair.
2. 💧 Rising Damp
Rising damp occurs when moisture from the ground seeps up through the walls. It’s often caused by poor drainage or a failed damp-proof course.
Look out for: Peeling paint, bubbling plaster, salt stains, or a persistent musty smell.
3. 🏚 Roof Problems
Your roof is your home’s first line of defense against the elements. Inspections often reveal cracked tiles, rusted flashings, blocked gutters, holes to the roof, overtightened screws, poor sealant around penetrations, or sagging sections.
Why it matters: Small roof issues can lead to water damage, mould, and expensive repairs.
4. 🌧 Poor Drainage & Site Grading
Water should always flow away from your home—not toward it. If the property has poor drainage or flat/sloping grading toward the foundation, it can lead to long-term water damage or structural issues.
Risk: Foundation movement, damp basements, and erosion.
5. 🧱 Foundation Cracks & Movement
Not all cracks are equal. Hairline cracks may be harmless, but wide, uneven, stepped or growing cracks could signal structural movement.
What to check: Diagonal cracks around doors/windows, uneven floors, or sticking doors and step cracking to walls.
6. 🚿 Plumbing Defects
Old or poorly maintained plumbing systems are a common issue. Inspectors often flag rusted or damaged pipes, leaks under sinks or to toilets and showers, high moisture readings throughout properties, water pressure issues, and evidence of water leaks or flooding.
Watch for: Water stains, dripping taps, or strange noises from the pipes.
7. 🧱 Structural Alterations or Additions
Previous owners may have removed or modified walls, beams, or other load-bearing elements without proper approval. These unverified changes can compromise the home’s structural integrity.
Red flags: Unsupported openings, visible sagging, cracking or evidence of cutting or altering frames and beams in the roof space.
Why it matters: Fixing unsafe structural changes can be expensive and legally complex.
8. 🌫 Poor Ventilation
Poor ventilation can lead to high moisture readings and mould and mildew. This can be a health hazard and a sign of bigger issues like leaks or condensation problems. Poor ventilation can be found in areas such as subfloors and wet areas within a property.
Tip: Use your nose—musty smells can often lead you to the problem.
9. 🚧 Illegal or Unapproved Renovations or DIY Work
That new deck or converted garage might look great—but was it approved by the local council? Unpermitted work can lead to compliance issues, fines, or even forced removal. Be aware of DIY renovation work as well as this is often not completed in a tradesman like manner.
Red flags: Missing permits, unregistered structural changes, or mismatched plans.
Why it matters: You may be legally responsible for fixing or undoing non-compliant work after purchase.
10. 🚪 Door & Window Defects
Misaligned doors or sticky windows might seem minor, but they can signal shifting foundations, moisture ingress, or poor-quality installation.
Bonus: Faulty seals and frames reduce energy efficiency and increase heating/cooling bills as well as leading to potential moisture problems.
🔍 Final Thoughts
A pre-purchase building and pest inspection is your best defense against unexpected costs and future headaches. Whether it’s termite damage, rising damp, or roof issues, knowing what you’re walking into allows you to negotiate repairs or walk away if needed.
Pro tip: Always hire a qualified inspector and don’t be afraid to ask detailed questions after receiving the inspection report.
Call Informed Building Inspections on 1300 246 367 or explore our website to find out more or receive your FREE Quote.
