Cracked, blown, or discoloured rendering doesn’t just ruin the kerb appeal of your home. If left untreated, it allows driving UK rain to penetrate your brickwork, leading to severe damp issues inside your property.
I have seen homeowners try to patch-repair crumbling walls themselves, only to spend thousands fixing the structural water damage later. Rendering is a heavy-duty job that requires skilled tradespeople and scaffolding. In this guide, I break down the true costs of rendering a house so you can budget accurately.
How much does rendering cost per square metre? In the UK, you can expect to pay between £40 and £80 per square metre for house rendering. Traditional sand and cement is the cheapest at £40 to £60 per m², while modern coloured monocouche (like K-Rend) or silicone renders cost between £60 and £80 per m². You must also budget an additional £800 to £1,200 for scaffolding.
Average UK rendering costs per square metre (£)
To give you a realistic idea of what you will spend, I have broken down the average costs for standard UK property sizes. These figures include the supply of materials and the professional labour required.
| Property Size | Estimated Wall Area (m²) | Sand & Cement Cost | Monocouche / Silicone Cost |
| Small Terraced House | 40 – 50 m² | £1,600 – £3,000 | £2,400 – £4,000 |
| 3-Bed Semi-Detached | 90 – 140 m² | £3,600 – £8,400 | £5,400 – £11,200 |
| 3-Bed Detached | 110 – 160 m² | £4,400 – £9,600 | £6,600 – £12,800 |
| 4-Bed Detached | 180+ m² | £7,200+ | £10,800+ |
Material costs: Sand and cement vs. Monocouche rendering
The biggest factor in your quote will be the type of render you choose.
Sand and Cement: This is the most traditional method. It is mixed on-site to a specific ratio and applied in two layers. The raw materials are incredibly cheap. However, it takes days to dry, requires a lot of labour to apply, and you will have to pay a decorator to paint it once it cures. If you are doing patch repairs, ensure your tradespeople are using the correct brick mortar mix ratio to prevent it cracking again.
Monocouche (Scratch Render): Often known by brand names like K-Rend or Weber, monocouche is a modern, pre-mixed render supplied in bags. It is significantly more expensive to buy than sand and cement. However, it is applied in a single coat and the colour is mixed directly into the bag. This completely removes the need for painting, making the final installed cost very comparable to traditional methods.
Silicone and Acrylic: These are thin-coat renders highly resistant to cracking. Silicone is particularly popular in the UK because it is water-repellent and “self-cleaning”, meaning dirt washes off in the rain rather than staining the walls.
The hidden costs: Scaffolding, waste, and insulation
The biggest shock for homeowners is the knock-on cost of hiring trades. You are not just paying for bags of sand and cement.
Because renderers need safe access to the entire exterior of your property, scaffolding is a non-negotiable legal requirement for anything above a single storey. Hiring scaffolding for a standard 3-bed semi-detached house will cost roughly £800 to £1,200. You can compare current scaffolding hire rates in your local area to get a firm idea.
You also need to budget for a skip (£250 to £350) to dispose of the old render if your walls need stripping back to the bare brick.
The Part L Building Regulations Trap
If you are removing old render and rendering more than 25% of an exterior wall, UK Building Regulations (Part L) dictate that you must upgrade the thermal insulation of that wall at the same time. This often means installing External Wall Insulation (EWI) boards before rendering, which can easily double your overall budget. Always check the official Planning Portal guidelines before starting work.
Patch repair vs. a full re-render
If you only have a few hairline cracks or a small patch of blown render, a local tradesperson can patch it for a few hundred pounds.
However, blown render is usually a symptom of a wider issue. Water gets behind the render, freezes during the winter, and pushes the cement off the brickwork. If large chunks sound hollow when you tap them, a patch repair is a waste of money. The surrounding render will simply fall off next year. If your brickwork underneath is in beautiful condition, you might find that checking the cost of repointing brickwork is a better option than covering it all back up.
For more advice on maintaining your property exterior, explore our other outside your home renovation guides.
FAQs
Does rendering a house add value?
Yes. A newly rendered house significantly improves kerb appeal and protects the underlying brickwork from dampness. While you may not make back £10,000 in equity on a £10,000 rendering job, it makes the property vastly more appealing to buyers and helps it sell much faster.
Can I claim rendering on my home insurance?
Generally, no. If your render has failed due to age, wear and tear, or poor maintenance, your home insurance will not cover the cost of replacing it. You can only claim if the damage was caused by a specific, sudden event like an impact, a storm, or severe flooding.
How long will new rendering last?
If applied correctly to clean brickwork and protected from extreme structural movement, modern silicone or monocouche rendering will easily last between 20 and 40 years without needing major repairs.
