What is it?
Cracks that run straight up and down a wall, often following the line of a single brick or a plaster joint.
What does it look like?
[Insert Photos] A straight vertical line. In brickwork, it may pass through the bricks themselves or the mortar joints.
Common causes
1. Thermal expansion and contraction
2. Drying shrinkage (in new builds)
3. Minor settlement
4. Wall tie failure
How serious is it?
Rating: Low Concern. Vertical cracks are often cosmetic or caused by natural expansion. However, if they are wider at the top, it may indicate movement.
How to tell which cause you have
Is the house new? If so, it’s likely drying shrinkage. Does it open in summer and close in winter? That’s thermal movement.
What should you do next?
Monitor for 6 months. If the width remains stable, fill and redecorate.
Typical repair options
Flexible filler for plaster; repointing or expansion joints for masonry.
Typical repair costs (UK)
£50 – £500.
Frequently Asked Questions
1. Are vertical cracks normal? Yes, in many cases.
2. Can they be caused by heat? Yes, thermal expansion is common.
3. Should I worry if it’s in a new build? Usually, it’s just ‘settling in’.
4. What if it’s wider than 3mm? Seek professional advice.
5. Do they affect house value? Rarely, if cosmetic.