The short answer
All three are through-coloured renders that avoid painting, but they differ: silicone is the most flexible, water-repellent and self-cleaning; acrylic is tough and colour-stable but less breathable; monocouche is a thicker single-coat render with a traditional scraped texture. Silicone and acrylic are thin-coat systems applied over a base coat and mesh; monocouche is applied in one thickness. On cost they are close — roughly £45–£70 per m² fitted — so the choice usually comes down to the wall, the look and breathability rather than price. These are general descriptions, not a recommendation for your property.
Through-coloured renders have largely replaced painted cement on modern homes because they look clean and need little maintenance. The three most common are silicone, acrylic and monocouche, and they are easy to confuse. This guide compares them on the things that matter — finish, flexibility, breathability, maintenance and cost — so you can discuss the right one with a specialist. All figures are typical illustrations rather than quotes, and rendering should be carried out by a trade-accredited rendering specialist.
Silicone, acrylic & monocouche at a glance
- Silicone Flexible, water-repellent, self-cleaning
- Acrylic Tough, colour-stable, less breathable
- Monocouche Thick single coat, scraped texture
- Application Silicone/acrylic: thin-coat + mesh
- Cost (fitted) £45–£70 per m²
- Painting None — all through-coloured
How they compare
The biggest practical differences are breathability and flexibility. Silicone lets some moisture vapour out while repelling rain, and it flexes with the building, so it resists cracking and stays cleaner for longer. Acrylic is very hard-wearing and holds colour well but is less breathable, so it is better suited to walls that are not prone to damp. Monocouche is a single thicker coat that gives a traditional textured finish and is quick to apply, but being cement-based it is more rigid than silicone.
| Feature | Silicone | Acrylic | Monocouche |
|---|---|---|---|
| Breathability | Good | Lower | Moderate |
| Flexibility / crack resistance | High | High | Moderate |
| Self-cleaning | Yes | Partly | Less so |
| Finish | Smooth, through-coloured | Smooth, through-coloured | Scraped texture, through-coloured |
| Fitted cost per m² | £50–£70 | £50–£70 | £45–£65 |
Which suits which home
For most modern cavity-wall homes, silicone is a popular all-rounder because of its flexibility and low maintenance. Acrylic can be a good choice where toughness and colour stability matter and damp is not a concern. Monocouche suits those who want a traditional textured look in a single application. None of the three is a like-for-like substitute for a breathable lime render on an older solid-wall property — there, breathability comes first. A specialist matches the system to the wall on a survey.
Cost and value
On price the three are close, so cost is rarely the deciding factor between them; the bigger cost differences come from prep, access and whether old render must be removed. Because all three avoid painting and resist weathering, they tend to cost less over their life than painted sand-and-cement. For how the choice feeds into resale and kerb appeal, see does rendering add value and is rendering worth it.
Compare rendering quotes
The right through-coloured render depends on your walls and the look you want. Use our service to compare quotes from trade-accredited rendering specialists in your area.
Frequently asked questions
Is silicone render better than acrylic?
Silicone is generally more breathable and more self-cleaning, which suits most homes; acrylic is very tough and colour-stable but less breathable, so it is better where damp is not a concern. Neither is universally “better” — the right one depends on the wall.
Is monocouche cheaper than silicone render?
Monocouche is often slightly cheaper per m² (around £45–£65 fitted versus £50–£70 for silicone), but the difference is small. Prep, access and removal of old render usually move the total far more than the choice between these systems.
Do any of these need painting?
No — silicone, acrylic and monocouche are all through-coloured, so the colour runs through the render and there is no separate painting cost. That is a key advantage over sand-and-cement, which is typically painted and repainted.
Which render is best for an older house?
For older, solid-wall homes, breathability usually comes first, so a lime or mineral render is often more appropriate than silicone, acrylic or monocouche. A specialist assesses the wall construction on a survey. See types of render explained.
Sources & further reading
- Render system manufacturers’ approved-installer schemes — system specification, finishes and warranties
- Federation of Master Builders (FMB) — finding vetted builders and consumer guidance
- GOV.UK / Building Regulations Approved Document L — thermal standards when external wall insulation is added
- RICS — guidance on home improvements and value
This is general information, not advice for your specific property. The right render depends on your walls; rendering should be carried out by a trade-accredited rendering specialist. We are an independent information and introduction service, not a renderer.