What is Render?
External wall rendering is the process of applying a protective and decorative coating to a building’s exterior walls. Render can cover suitable brickwork, blockwork or render carrier boards, creating a finish that changes the appearance of the building and helps protect it from the weather.
Render products vary in composition. Options include traditional sand and cement, lime-based renders, through-coloured monocouche renders and thin-coat finishes such as silicone and acrylic. The right choice depends on the wall’s construction, its condition and the requirements of the complete render system.
External wall rendering can produce smooth, scraped or textured finishes in a range of colours. Some renders are coloured throughout, while others require a suitable paint finish. Render can also form the outer finish of an external wall insulation system, but a standard decorative render should not be confused with insulation.
Common Render Questions:
How do I choose a render for external walls?
Start with the wall itself. The substrate—such as brickwork, blockwork or render board—and any existing coatings will influence which render systems are suitable. The condition of the wall, its exposure to weather and the finish you want also matter.
Compare complete systems, including any required basecoat, reinforcing mesh, primer and finishing coat. Follow the manufacturer’s specification for the chosen substrate, as these requirements vary between systems.
Our guide to the different types of render explains the main options. If you need an installer to assess your property and provide a quotation, use our Find Approved Applicator service.
What is the difference between Rendering and Plastering?
Rendering and plastering are often performed using similar products and techniques, however the term rendering applies to the use of these materials on exterior walls, whereas plastering refers to the use of these materials on interior walls.
What colour does render come in?
Render is available in a range of colours, with the choice depending on the manufacturer and product. Through-coloured renders contain pigment within the material, while some other render finishes are designed to be painted.
Use the colour chart for your chosen product and, where available, request a physical sample. Colours viewed on a screen may look different from the finished wall, and the texture can also affect their appearance.
How long will render last?
The lifespan of external wall rendering depends on the render system, the condition of the substrate, application quality, weather exposure and maintenance. There is no single lifespan that applies to every product or property.
Check the manufacturer’s maintenance guidance and any warranty conditions for your chosen system. Inspect the finish periodically, investigate cracks or loose areas, and address leaking gutters or other sources of water that could damage the wall.
Can I render an external wall myself?
External wall rendering requires careful preparation, suitable materials and control over application thickness, timing and weather conditions. Mistakes can affect the finish and how well the render adheres to the wall.
For a whole house, work at height or a wall with existing defects, use an experienced rendering contractor. They can assess the substrate and recommend a suitable system. Our Find Approved Applicator service can help you find an installer.
How much does external wall rendering cost?
The cost depends on the area being rendered, the chosen system, the condition of the walls and the access required. Removing existing render, repairing the substrate and providing scaffolding can all affect the total.
Product prices cover only part of the project. When comparing installers’ quotations, check whether preparation, materials, labour, scaffolding, waste removal and VAT are included. Ask each installer to quote for the same scope of work so you can compare costs fairly.