Is This Wall Crack Serious?
A small, stable hairline crack can be cosmetic. Concern rises if the crack is widening, diagonal, repeated around openings, accompanied by sticking doors/windows, bulging, water ingress or other movement.
Often 2–5/10 for a small stable crack; higher if movement or instability is present
General guidance only — not a diagnosis or legal, financial or professional determination.
What makes it more serious?
- The crack is growing or widening
- There is bulging, sagging or obvious movement
- It appeared suddenly alongside water damage or structural change
What should you check next?
- Photograph and measure it so you can compare later
- Look for similar cracks nearby and signs of movement
- Arrange a qualified inspection if it is changing or substantial
Use the checker for your exact situation
Add the wording, deadline, warning symbol or other detail you can see. The checker will give you a 1–10 urgency score, explain why, and show what would make the situation more serious.
For immediate danger to life, fire, gas, serious electrical risk, severe injury or another active emergency, use the appropriate emergency service rather than relying on this checker.