Cracking in Brickwork: When to Worry and What Your Building Inspector Looks For

If you are buying a property on the Gold Coast, one of the most common findings you will see in a building inspection report is cracking in brickwork. But not all cracks are equal. Some are purely cosmetic, while others can signal serious structural movement that could cost thousands to repair.

Understanding the difference is essential for making an informed purchasing decision, and it is one of the key areas a qualified building inspector assesses under AS 4349.1-2007, the Australian Standard for pre-purchase inspections of residential buildings.

What Causes Cracking in Brickwork?

Cracking in external brickwork can result from a range of factors. On the Gold Coast, the most common causes include differential foundation movement due to reactive clay soils, thermal expansion and contraction of building materials, poor initial construction or inadequate footings, tree root activity affecting foundations, and moisture changes in the ground following prolonged dry or wet periods.

The direction, width, location, and pattern of the cracking all provide clues about the underlying cause. A diagonal crack near a window, for example, may suggest foundation settlement, whereas uniform horizontal cracking along a mortar course could indicate thermal movement.

How Cracks Are Classified Under AS 4349.1

Under AS 4349.1-2007, building defects are classified by type and severity. Cracking in brickwork falls under Type A (Damage), and can be classified as either a Major Defect or Minor Defect depending on its characteristics.

A Major Defect is defined as a defect of sufficient magnitude where rectification has to be carried out in order to avoid unsafe conditions, loss of utility, or further deterioration of the property. Cracking wider than approximately 2mm, diagonal cracking near openings, or cracking associated with visible wall displacement will typically be classified as major.

A Minor Defect is one that does not meet the major threshold. Hairline cracks under 1mm in mortar joints, for example, are generally considered minor and are common in most brick buildings. However, even minor cracks are noted in the report as they may collectively indicate a broader pattern.

When a Structural Engineer Referral Is Recommended

Under our professional indemnity insurance and in accordance with Australian Standards, building inspectors are required to recommend further assessment by a qualified structural engineer when significant cracking is identified. This includes cracking that may be indicative of differential foundation movement, cracking that is progressive or has been previously repaired and re-opened, cracking associated with distortion of door or window frames, and any pattern of cracking that suggests subsidence or structural compromise.

A structural engineer can undertake a more detailed investigation including level surveys, soil testing, and monitoring to determine the cause and recommend appropriate remedial action.

What to Look For at an Open Home

While a professional inspection is always recommended before purchasing, here are some signs to watch for when visiting a property. Look for diagonal cracks near windows and door openings, gaps where walls meet ceilings or floors, doors or windows that stick or do not close properly, visible patching or repainting over cracks which may indicate previous repair attempts, and cracking in both internal and external walls at similar locations.

If you notice any of these signs, it does not necessarily mean the property should be avoided, but it does mean you should ensure a thorough pre-purchase building inspection is carried out before committing to the purchase.

The Bottom Line

Cracking in brickwork is one of the most important findings in any building inspection. It can range from a minor cosmetic issue to a sign of significant structural movement. The key is having a qualified inspector who understands how to assess and classify these findings in accordance with AS 4349.1-2007, and who knows when to recommend specialist investigation.

At Cyte Building Inspections, every crack is documented, measured, photographed, and classified. We ensure our reports give you the information you need to make confident property decisions on the Gold Coast.

If you are buying a property and want peace of mind, contact us today on 0431 114 815 or visit www.cyte.au to book your inspection.