Common Building Defects Found During Inspections

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Building inspections commonly identify a range of defects and maintenance issues within residential properties. Some defects are minor and age-related, while others may involve significant repair costs or ongoing moisture and structural concerns.

Understanding common building defects can help property buyers make more informed decisions before purchasing a home.

Moisture ingress is one of the most common and potentially expensive issues identified during building inspections.

Moisture problems may occur due to:

• Roofing defects 
• Cladding failures 
• Inadequate flashings 
• Poor drainage 
• Plumbing leaks 
• Failed sealants 
• Insufficient ventilation 

Signs may include:

• Damp odours 
• Staining 
• Swelling materials 
• Mould growth 
• Elevated moisture readings 
• Timber decay 

Unchecked moisture ingress can lead to serious long-term damage.

Roofing issues are frequently identified, particularly in older properties.

Common roofing concerns include:

• Rusted roofing 
• Loose ridge caps 
• Failed flashings 
• Blocked gutters 
• Ponding water 
• Damaged tiles 
• Poor previous repairs 

Roof leaks may sometimes remain hidden until significant damage has already occurred.

Timber decay commonly occurs where timber is exposed to prolonged moisture.

Common areas include:

• Decks 
• Exterior stairs 
• Window joinery 
• Cladding 
• Subfloor framing 
• Roofing timbers 

Timber decay can range from minor cosmetic deterioration through to structural weakening.

Cracking is common in many buildings and is not always structurally significant.

However, some cracking patterns may indicate:

• Foundation movement 
• Settlement 
• Structural stress 
• Moisture-related movement 
• Inadequate support 

An experienced inspector can often identify whether cracking appears typical for the building age and construction type or whether specialist engineering assessment may be advisable.

Inadequate site drainage can contribute to:

• Moisture ingress 
• Foundation movement 
• Subfloor dampness 
• Mould growth 
• Accelerated building deterioration 

Poor drainage is often identified around:

• Downpipes 
• Retaining walls 
• Driveways 
• Subfloor areas 
• Low-lying sections 

Building inspections frequently identify:

• Poor-quality renovations 
• Non-compliant alterations 
• Incomplete repairs 
• Unsafe workmanship 

DIY work can sometimes create hidden long-term problems, particularly involving waterproofing, structure, plumbing, or electrical systems.

Poor ventilation may contribute to:

• Condensation 
• Dampness 
• Mould growth 
• Indoor air quality concerns 

Common problem areas include:

• Bathrooms 
• Laundries 
• Kitchens 
• Roof spaces 
• Subfloor areas 

Many properties show signs of maintenance being postponed over time.

Examples include:

• Peeling paint 
• Blocked gutters 
• Weathered sealants 
• Timber deterioration 
• Corroded fixings 
• General ageing and wear 

While some maintenance issues are minor individually, cumulative deferred maintenance can become expensive over time.

Many defects are not obvious during casual property viewings.

A professional building inspection can help identify:

• Significant visible defects 
• Potential future costs 
• Moisture concerns 
• Safety issues 
• Areas requiring specialist advice 

This helps buyers better understand the condition of the property before committing to purchase.

The Master Inspector Association connects experienced inspectors across Australia and New Zealand.

To locate a participating inspector within your area, visit:

Australia:
https://masterinspector.org.au/find-an-inspector

New Zealand:
https://mianz.org.nz/find-building-inspector