Replastering walls might not be high on your home maintenance list, but ignoring the signs of wall damage can lead to bigger problems down the line. Whether you own an older property or you’re mid-renovation, understanding when your walls need attention is key to protecting the structure and value of your home.

Here are five clear signs that it might be time to consider replastering your walls.

When Does a Wall Need Replastering?

1. Cracks in the Plaster

Hairline cracks may appear over time due to natural settling, but deeper or spreading cracks are a sign of concern. These might result from structural movement, moisture ingress, or the original plaster drying too quickly.

Pay special attention to cracks that:

• Follow along the corners of the wall or ceiling
• Appear around windows or doors
• Run vertically or horizontally across large sections

If you notice multiple cracks or they seem to be getting worse, it could be time for a professional to assess whether a full replastering job is needed.

Why it matters: Cracks can let in damp and lead to loose plaster if left untreated.

2. Bulging or Loose Plaster

Does the surface of your wall feel soft, or can you hear a hollow sound when you knock on it? That’s a classic sign of plaster delaminating from the wall behind it. This often happens when the adhesive bond fails or when moisture seeps in over time.

In some cases, small areas of loose plaster can be repaired. But if large sections are coming away, it’s time to consider replastering the wall completely.

Look out for:

• Blistering paint or bubbling wallpaper
• Sagging or rippled sections of the wall
• Chunks of plaster falling away

Tip: Use a trowel to gently tap over the surface. A dull, solid thud is good. A hollow sound suggests the plaster has separated.

3. Damp or Water Stains

One of the most common causes of plaster damage is moisture. Rising damp, leaky roofs, or condensation can all cause damp patches to form on your internal walls. Left untreated, damp will soften and eventually break down plaster.

You might notice:

• Yellow or brown staining
• Salt deposits (white, powdery marks)
• Flaking paint and crumbling edges

Before replastering, always fix the source of the damp and allow the wall to completely dry out. A professional plasterer can advise if additional damp proofing or a breathable type of plaster is needed.

Pro tip: For persistent damp walls, consider using lime plaster or other breathable materials that allow moisture to evaporate safely.

4. Uneven or Rough Textures

If your walls look bumpy, overly textured, or show visible tool marks, they may have been poorly plastered in the past. This is common in older properties or in DIY attempts that haven’t stood the test of time.

Poor finishes can affect:

• The look and feel of your room
• How well paint or wallpaper adheres
• Long-term durability

A smooth surface isn’t just about appearance—it also protects the wall underneath. A professional skim coat or complete replaster can create a fresh, even finish that’s easier to maintain.

Bonus tip: Want to paint your walls in a deep colour? A flat finish makes all the difference for a flawless result.

5. Ageing or Flaking Plaster

Plaster doesn’t last forever. Over time, old plaster naturally begins to break down. You may spot areas where the surface is chalky, crumbling or where small amounts of plaster seem to come off when touched.

If you see signs of wear like:

• Dusty residue near skirting boards
• Loose plaster accumulating behind furniture
• Flaking or peeling off in small sections

… it may be time to renew the wall entirely.

Older homes often used lime-based or gypsum plasters that degrade over the decades. Replastering with modern materials can help restore and protect the integrity of the wall.

When to Call a Professional Plasterer

You might be tempted to patch things up yourself. But for any major wall damage—or if multiple signs are present—it’s best to bring in a professional. Replastering a wall involves assessing the substrate, mixing the plaster, applying the right number of coats, and finishing with precision.

Professionals will:

• Ensure the layer of plaster is consistent
• Use the right type of plaster for the wall material (e.g. brick, block, plasterboard)
• Identify hidden issues like rising damp or structural movement
• Deliver a clean, flat, completely dried finish

If you’re unsure where to start, contact LWM Plastering for honest advice and expert help. We handle everything from small touch-ups to full room replastering jobs across South London.

If you’ve spotted any of these signs—cracks, damp, loose areas or flaking—don’t wait. Replastering walls can breathe new life into your home and prevent bigger issues in the future. Call our expert team for your painting & decorating needs today.