Crack Repair Guide – What You Need to Know and How to Fix It

If you’ve spotted a crack in a wall, floor or foundation, you probably wonder if it’s a big deal. The short answer: not every crack needs a contractor, but some do. In this guide we’ll break down the most common cracks, what they mean, and how you can tackle the easy ones yourself. You’ll also get a quick look at typical repair costs so you’re not surprised by a bill.

Common Types of Cracks and What They Tell You

First, identify the crack. Horizontal cracks in a foundation often signal pressure from soil and can be serious. Vertical cracks, especially those less than a millimetre wide, are usually just normal settling. Stair‑step cracks in brick walls often point to movement in the supporting structure. Knowing the pattern helps you decide if you need a professional or a simple DIY fix.

How to Fix a Crack – Step‑by‑Step DIY

For small vertical or hairline cracks, start by cleaning out any loose material with a wire brush. Next, apply a masonry filler or epoxy crack sealant, pushing it deep into the gap. Smooth the surface with a putty knife and let it cure as the product recommends – usually a few hours. After it hardens, sand lightly and paint to match the surrounding area. If the crack is wider than 5 mm or you see water seepage, call a specialist.

When a crack is in a concrete slab, you might need a concrete repair kit. These kits include a bonding agent, filler, and a trowel. Mix the filler, spread it evenly, and finish with a floating tool. For foundation cracks, the best long‑term solution often involves installing steel reinforcement bars (wall ties) and a waterproof membrane – jobs that need a qualified contractor.

Cost wise, DIY repairs can run under £50 for filler and tools. Professional seam‑sealing starts around £150, while thorough foundation repair can climb to £2,000‑£5,000 depending on depth and access. Always ask for a written quote and check if your home insurance might cover structural damage.

Bottom line: a quick visual check can tell you if you’re dealing with a harmless settlement crack or a sign of deeper trouble. Small cracks are easy to fix with the right filler and a bit of patience. Bigger issues deserve a pro’s eye to keep your home safe and avoid costly repairs later. Keep this guide handy the next time a crack pops up – you’ll know exactly what steps to take.