Rendering cost calculator
Get a quick cost estimate for any rendering job. Enter your wall area, choose the render type, and select the number of coats to see materials cost, bags required, and an optional labour estimate.
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Choosing the right render for your job
The render type affects not just cost but long-term performance and whether the job will suit the building. For most modern brickwork and blockwork — extensions, new builds, modern houses — sand and cement or monocouche are the standard choices. Sand and cement is cheaper per bag and can be painted to any colour; monocouche is through-coloured and eliminates maintenance repainting.
Silicone renders are thin-coat systems applied over a prepared base coat. They are hydrophobic (water repellent), self-cleaning to a degree, and highly flexible — less prone to cracking on buildings that move with seasonal temperature changes. The materials cost is higher but the finish quality and durability justify it on higher-value properties.
Tyrolean is a textured finish sprayed or hand-applied over a prepared base. It is commonly used on properties built from the 1930s to 1970s as a repair or re-render solution where matching the existing texture matters. It is quicker to apply than a smooth finish and hides minor imperfections in the substrate.
Lime render is essential on pre-1919 buildings with solid brick or stone walls. Cement-based products trap moisture in traditional masonry, causing long-term damage. Lime is breathable, flexible, and compatible with the original building fabric. On listed buildings, local planning authorities often require lime render as a condition of consent.
When pricing a rendering job, remember to account for access — scaffold hire adds significantly to total project cost on anything above single-storey. Surface preparation (removing old failing render, treating cracks, applying bonding agents) often takes as long as the render application itself and needs to be priced accordingly. Use our scaffolding calculator to estimate that part of the job.
Frequently asked questions
How much does external rendering cost per m² in the UK?
For a fully installed price (materials and labour), expect to pay £30–£50/m² for sand and cement render, £45–£65/m² for monocouche, £50–£75/m² for silicone or acrylic render, and £55–£80/m² for lime render on older properties. These are 2025/26 guide prices. Final costs depend on the condition of the substrate, access requirements, and your region — London and the South East typically sit at the upper end.
How many bags of render do I need per m²?
A standard 25kg bag of sand and cement render covers approximately 1m² at 10mm thickness. Monocouche render covers slightly more, around 1.2–1.3m² per bag at the recommended application depth. For a two-coat system (scratch coat plus finish coat), multiply your bag count by two and add 10% for wastage. Silicone and thin-coat finishes use less material per coat but require a primed base coat.
What is the difference between monocouche and sand cement render?
Sand and cement is a traditional two-coat system — a scratch coat followed by a finish coat, often painted or colour-washed. Monocouche is a single-coat through-coloured system that eliminates the need for painting, though it costs more per bag. Monocouche is popular for new builds and modern extensions because the integral colour requires no maintenance repainting. Sand and cement is often the better choice for repairing or matching existing rendered elevations.
Do I need a primer before applying silicone render?
Yes. Silicone and acrylic thin-coat renders require a primer or base coat before application. Most manufacturers supply a matching primer or specify a reinforced base coat with mesh embedded. This is normally applied to a prepared substrate — freshly applied sand and cement, existing sound render, or a bonding coat on block work. Without the primer, adhesion is compromised and the thin coat can peel or crack.
When should I use lime render instead of sand and cement?
Lime render is the right choice for pre-1919 buildings with solid brick or stone walls. Cement-based renders trap moisture in older walls, which can cause spalling, rising damp, and structural damage over time. Lime is breathable (vapour permeable), flexible, and self-healing for minor cracks. If you are working on a listed building or any property with traditional solid-wall construction, lime is not just recommended — it is often a planning requirement.
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