Found a crack in a wall, floor or foundation and wonder if it’s a big deal? You’re not alone. Most homeowners see cracks and panic, but not every crack means a disaster. This guide breaks down the types of cracks you’ll meet, what they say about your home, and how to fix them without blowing your budget.
First, tell the difference between cosmetic and structural cracks. Hairline cracks – the thin lines you see in plaster or drywall – are usually harmless. They happen as the building settles or when temperature changes. Vertical cracks that run up and down a wall can be normal in new builds, but if they widen over weeks they might signal shifting loads.
Horizontal cracks in foundations are a red flag. They often appear as a straight line across a concrete block or brick wall. Because they fight against the pressure from the soil, they can indicate serious structural stress. If you spot one, call a professional right away.
Finally, step cracks in stairs or slab foundations look like a series of small offsets. They usually mean the ground underneath is moving, and you’ll need a structural engineer to assess the damage.
Not every crack needs a specialist, but here are the quick rules of thumb:
These steps help you avoid costly surprises later on.
If the crack is small and you’ve got the green light, here’s a simple repair plan:
Even with a DIY fix, keep an eye on the repair for the next few weeks. If the crack reopens, it’s time to call in the experts.
What will you actually pay? Here’s a quick look at typical UK prices:
Getting a few quotes before you commit saves money and helps you pick the right crew.
Crack repair doesn’t have to be scary. Spot the type, know when to DIY, and call a pro for the risky ones. With the right steps, you’ll protect your home, keep its value, and avoid surprise repairs down the line.
