Structural cracks, subsidence and floor heave are serious defects that can affect the safety, value and long-term performance of Irish homes. These issues are commonly linked to ground movement, soil conditions, drainage problems and nearby trees, and are often identified during structural surveys.
▢ Why this matters to homeowners and buyers
- May indicate movement of foundations or ground beneath the property
- Can worsen over time if the underlying cause is not addressed
- Repairs can be complex and costly
- Often underestimated or missed during initial property viewings
▢ Common warning signs to look for
- Cracks in walls, ceilings or floors, particularly diagonal or stepped cracks
- Cracks wider than 3mm or cracks that continue to grow over time
- Doors or windows sticking, tilting or falling out of square
- Uneven, sloping or lifting floors and gaps at skirting boards
▢ Typical Causes of Structural Cracks and Floor Heave
- Poor ground conditions or shallow foundations in older properties
- Leaking or damaged drains, washing away supporting soil
- Clay soil shrinkage or swelling due to weather changes or tree removal
- Pyritic hardcore beneath ground floors, causing floor heave
