Cracked or Blown Render: Renderer, Builder or Decorator?

A renderer is usually the best first trade for cracked, loose or blown render, while a builder may be needed when the wall beneath is damaged and a painter and decorator is more suitable when sound render mainly needs preparation and repainting.

The visible crack is only part of the job description. The tradesperson needs to know whether the finish is still firmly attached, whether sections are breaking away and whether there are signs that the underlying wall also needs attention.

Start with a renderer for render failure

Use a renderer when the work appears to involve the render itself.

Examples include:

• cracked render that needs proper repair;
• hollow or loose areas;
• sections that have broken away;
• patch repairs that have failed;
• large areas needing removal and replacement;
• an exterior wall needing a new render finish;
• damaged corners, reveals or edges formed in render;
• repeated deterioration of previous render repairs.

A renderer can assess the condition of the existing finish and what preparation is needed before repair or replacement.

When a builder may be needed

A builder may be more appropriate, or may need to work alongside the renderer, if the underlying wall or building fabric appears damaged.

For example:

• masonry is visibly loose or broken beneath missing render;
• a wall opening, lintel area or other building element also needs repair;
• substantial cracks continue through more than just the surface finish;
• previous building work appears to have failed;
• the render damage is part of a larger external renovation;
• the wall needs repair before a new finish can be applied.

Do not diagnose structural movement from appearance alone. If there are significant or concerning cracks in the building fabric, the appropriate professional may need to assess the cause before cosmetic repair is planned.

When a painter and decorator is the better fit

A painter and decorator is more suitable when the render is fundamentally sound and the main task is exterior preparation and coating.

Examples can include:

• faded exterior masonry paint;
• normal flaking or peeling coatings on otherwise sound render;
• small surface imperfections within ordinary decorating preparation;
• repainting after render repairs have properly cured and are ready for decoration;
• colour changes to an intact rendered elevation.

Painting loose or failing render does not repair the underlying defect. If sections are hollow, cracked deeply or breaking away, start with the render condition rather than the colour coat.

What does “blown render” mean in a job enquiry?

Homeowners often use “blown” to describe render that sounds hollow, has detached from the background or is bulging or breaking away.

You do not need to prove exactly how much is detached. Tell the renderer what you can observe:

• visible bulges;
• cracks around a patch;
• loose edges;
• pieces falling away;
• hollow-sounding areas if this was already noticed without unsafe testing;
• damp or staining nearby;
• previous patch repairs.

Do not start hammering, cutting or pulling at exterior render simply to establish the extent of failure.

What if pieces are falling?

If loose material could fall onto a path, entrance, pavement or neighbouring area, say so when you contact the trade.

Keep people away from the immediate fall zone where practical and avoid standing beneath obviously loose material to inspect it.

The tradesperson can decide what access and temporary precautions are appropriate.

What if there is damp inside the wall?

Mention it, but do not assume the cracked render is automatically the cause.

Tell the tradesperson:

• where the internal damp appears relative to the exterior damage;
• whether it worsens after rain;
• whether gutters, roof details, windows or pipework are nearby;
• whether the wall has previous damp or render repairs;
• whether the problem is recent or longstanding.

A damp specialist, roofer, plumber or builder may be relevant depending on the actual source. The visible render should not be treated as proof of the moisture path.

Access can change the job

Exterior render repairs may be at ground floor, above extensions or across a full elevation.

Include:

• how many storeys are affected;
• approximate height and area;
• whether the damaged wall is above a conservatory or extension;
• side-access width;
• parking or loading restrictions;
• whether neighbouring land is close to the wall;
• whether scaffolding is already present.

Do not assume scaffolding is always or never required. Let the trade assess the work and access.

Sussex weather exposure is useful context, not a diagnosis

Properties near the Sussex coast can experience exposed weather, but do not attribute every crack to salt, wind or rain without evidence. Inland properties can have render problems too.

The useful local detail is the property’s actual exposure and history: for example, a west-facing elevation in Worthing that takes heavy weather, or an older rendered wall in Brighton & Hove with several previous patch repairs.

The same trade-selection logic applies in Horsham, Crawley, Chichester, Eastbourne, Hastings and across Sussex.

What should you send with a render enquiry?

Include:

• your Sussex town;
• wide photos of the elevation;
• close photos from a safe position;
• approximate area affected;
• whether pieces are loose or falling;
• whether cracks are isolated or widespread;
• whether the render was repaired or painted before;
• whether there is visible damp inside;
• access constraints;
• whether you want a local repair, assessment or a larger re-rendering quote.

Match the trade to the layer that needs repair

Choose a renderer for damaged render.

Choose a builder when the wall or building fabric beneath also needs repair.

Choose a painter and decorator when the render is sound and the work is mainly exterior preparation and coating.

Browse Sussex renderers, browse builders, browse painters and decorators or post the job.