How to Fix Cracks in Walls
At Damax Design Solutions, we help homeowners and property developers across the UK
Cracks in Your Walls
If you’ve noticed a wall crack in your home, it’s natural to feel concerned. Cracks in your walls can be a sign of anything from cosmetic ageing to more serious structural problems. The good news? In many cases, you can repair cracks in walls easily with the right knowledge and approach. At Damax Design Solutions, we help homeowners and property developers across the UK assess, understand, and fix cracks in plaster walls and interior walls — ensuring your space is safe, sound, and visually appealing.
First things first — don’t worry. Many small cracks and hairline cracks are simply the result of normal building settlement or temperature fluctuations over time. Especially in new homes, it’s common to see minor movement as materials dry out and settle. These types of cracks rarely signal major issues and are usually straightforward to repair. However, it’s still important to know what you’re looking at.
What Causes Cracks in Your Walls?
Cracks in your walls can form for several reasons, and understanding the cause is the first step to choosing the right fix. Common causes include:
• Drying shrinkage: As plaster dries, small cracks can form on the surface.
• Settlement: As a building adjusts to its foundations, minor movement can create vertical or diagonal cracks.
• Moisture issues: Water ingress behind plaster or through bricks can weaken the surface.
• Structural movement: Larger cracks could be a result of ground movement or foundation shifts.
• Temperature changes: Expanding and contracting materials may cause cracking in both interior and exterior walls.
Identifying Types of Wall Cracks
Different types of cracks require different fixes. Here are some common types:
• Hairline cracks: These are very fine cracks, often less than 1mm wide, and usually not a cause for concern.
• Vertical cracks: Often caused by settlement and usually not serious unless widening.
• Diagonal cracks: May indicate foundation movement or structural shifting.
• Horizontal cracks: Can be more serious and may suggest structural issues or pressure from outside walls.
• Cracks around doors and windows: These can occur due to stress at structural weak points such as lintels or framing movement.
If you’re unsure whether the crack is structural or cosmetic, it’s best to speak to a qualified professional like our team at Damax Design Solutions.
How to Repair Cracks in Walls
Once you’ve identified the type of crack, you can decide whether it’s something you can fix yourself or if it requires a professional. Here’s a simple guide to dealing with small cracks and cracks in plaster walls.
Step 1: Clean the Area
Before starting the repair, gently clean the area with a damp cloth to remove dust and loose debris. If the wall crack is deep or wide, use a scraper to remove loose plaster from the edges of the crack.
Step 2: Open Up the Crack Slightly
For hairline cracks, gently widen the crack using a putty knife or a sharp tool. This might seem counterintuitive, but it helps filler adhere properly and create a lasting bond.
Step 3: Apply Filler
Use a high-quality wall filler suited for plaster or interior walls. Press the filler deep into the crack and smooth it off with a putty knife. Make sure the surface is level with the surrounding wall.
Step 4: Allow to Dry and Sand Smooth
Let the filler dry completely, then lightly sand the area to create a smooth finish. For larger cracks, more than one layer of filler might be needed.
Step 5: Prime and Paint
Once smooth and dust-free, apply a primer over the repaired area. This will stop paint from absorbing unevenly. Then, repaint to match the rest of your wall.
When to Call a Professional
While many wall cracks can be fixed easily, some signs should not be ignored. You should consult a structural expert if:
• The cracks are wider than 5mm.
• The cracks are growing longer or wider over time.
• You see cracks in multiple places.
• There are cracks near door frames or windows that make them difficult to open.
• There are signs of subsidence, such as sloping floors or sticking doors.
At Damax Design Solutions, we provide detailed assessments of wall cracks, including structural evaluations where needed. We can help determine whether the issue is cosmetic or something more serious, and offer repair solutions that meet building regulations.
Preventing Future Wall Cracks
Here are a few ways to reduce the risk of future cracks in your plaster walls:
• Control indoor humidity to avoid plaster expansion and contraction.
• Ensure your property has good drainage to prevent moisture from entering foundations.
• Check for signs of water ingress regularly, especially after heavy rain.
• Maintain your home’s exterior to avoid structural wear and tear.
• Use flexible fillers or paints in areas prone to movement to allow natural flex without cracking.
Fix Cracks in Your Walls with Damax Design Solutions
Whether you’re dealing with a small crack in your hallway or more extensive cracks in plaster walls, Damax Design Solutions is here to help. Our experienced team specialises in both structural evaluations and cosmetic repairs, offering peace of mind and professional finishes that last. From hairline cracks to deeper wall crack concerns, we take a thorough and supportive approach to ensure your home is safe, stable, and looking its best.
If you’re unsure about the cracks in your walls, don’t leave it to guesswork. Our friendly team can assess the issue and recommend the right way to repair cracks in walls — professionally and efficiently. We’re proud to support homeowners and property developers with high-quality service and trusted advice.
Contact Damax Design Solutions today to book a consultation or learn more about how we can help repair and prevent cracks in your walls.
Do Cracks Mean There Are Structural Issues?
Not always — many internal wall cracks are cosmetic. However, it’s the location, pattern, and size of the cracks that matter. If you’re dealing with recurring cracks, vertical cracks growing wider, or diagonal cracks crossing multiple walls, then a deeper investigation is needed. Spotting signs of structural problems early gives you the best chance to prevent serious damage.
Dealing With Signs of Subsidence
Subsidence occurs when the ground beneath your home shifts or sinks. This can create significant strain on the structure above, leading to cracks in interior walls, especially those running diagonally. Typical signs of subsidence include:
• Cracks wider than 3mm
• Step cracks in external brickwork
• Cracks appearing suddenly after dry weather
• Doors and windows sticking or misaligned
If you see any of these, Damax Design Solutions can carry out a structural engineer survey and recommend next steps.
Interior Design and Finishing After Repairs
Once cracks are repaired, interior wall finishes may need updating. Our team can advise on safe plastering, painting, and restoring the aesthetics of your home. A smooth finish not only improves appearance but helps seal and protect the repaired area. If cracks were caused by moisture, we’ll also look at improving airflow or insulation to prevent future issues.
How Damax Design Solutions Can Help
We provide clear advice and practical solutions for anyone experiencing cracks in their internal walls. Whether you need a structural engineer report or simply want reassurance, we’ll guide you through the process.
Our services include:
• Structural assessments and surveys
• Diagnosis of structural issues
• Expert advice on repair methods
• Coordination with builders and contractors
• Design and specification for remedial works
We work closely with homeowners, developers, and contractors across the UK to deliver safe, lasting solutions that meet building regulations.
Final Thoughts on Cracks in Internal Walls
Cracks are part of a building’s life, especially as it ages or adapts to seasonal conditions. But while some cracks are harmless, others can be early signs of deeper structural problems. Recognising which is which can save you stress, time, and money.
At Damax Design Solutions, we understand how worrying it can be to spot cracks in your home. That’s why we’re here to help — from initial surveys and assessments to planning repair work and managing your project. Whether you’re facing signs of subsidence, vertical cracks, or ongoing internal wall movement, trust us to provide clear, expert advice.
Need a professional opinion on internal wall cracks? Contact Damax Design Solutions today to book your survey and get peace of mind with our expert structural insight.