Rendering the exterior of a house is one of the most transformative renovations available for the money. A well-specified modern silicone or monocouche render can dramatically improve kerb appeal, protect the wall structure from moisture, and — when combined with external wall insulation — meaningfully reduce heat loss. It is also one of the most variable-cost jobs in construction, ranging from under £30/m² for basic sand-and-cement to £120/m²+ for EWI with premium render finish.
Typical Whole-House Rendering Costs (2026)
These figures assume a standard two-storey semi-detached or terraced house (approximately 120–160 m² of external wall area), in good structural condition, in the Midlands or North of England. Add 20–35% for London and the South East.
| House Size | Sand-and-Cement | Monocouche | Silicone Render | EWI + Silicone |
|---|---|---|---|---|
| 1-bed flat / terrace | £2,500–£4,500 | £3,500–£6,000 | £4,500–£8,000 | £8,000–£14,000 |
| 2–3 bed semi / terrace | £4,500–£8,500 | £6,000–£12,000 | £8,000–£15,000 | £14,000–£25,000 |
| 3–4 bed detached | £7,000–£14,000 | £10,000–£18,000 | £13,000–£22,000 | £22,000–£40,000 |
Scaffold hire for a standard semi typically runs £1,200–£2,500 and is usually included in full rendering quotes but worth confirming.
Render Types Explained
Sand-and-Cement Render
The traditional two- or three-coat system: scratch coat, float coat, and finish coat mixed on site from sand, cement, and often a plasticiser. Costs £25–£50/m² installed. Hard and stiff — prone to cracking as the building moves, and requires repainting every 5–10 years. Still widely used because it is understood by most plasterers and relatively low-cost.
Monocouche Render (Through-Coloured)
A factory-blended single-coat render applied at 15–20 mm. The colour is integral (pigment throughout the material), so surface chips are less visible. The most popular examples in the UK are Weber Pral M, Parex, and K-Rend K1. Cost: £40–£65/m² installed. Life expectancy 20–30 years without repainting; some products are self-cleaning when formulated with hydrophobic additives.
Silicone Render
A thin-coat (2–4 mm) decorative finish applied over a base coat (usually polymer-modified cement or insulation board). The silicone binder makes the surface highly flexible, hydrophobic, and vapour-open. Very popular since the mid-2010s. Cost: £55–£90/m² installed. Brands include Weber.pral SI, Sto Silco, and Parex Parlumière. Colours are stable and the surface is naturally dirt-resistant. Life expectancy 25–40 years.
Polymer / Acrylic Render
Similar to silicone in application (thin-coat over base coat) but uses acrylic rather than silicone binder. Slightly less vapour-open; more prone to algae in shaded areas. Cost: £40–£70/m² installed. More common in budget EWI systems.
Pebbledash
A finish coat of mortar into which small aggregate stones are thrown (“dashed”) before the coat dries. Highly textured and durable; common on 1920s–1960s housing. Replacing existing pebbledash costs £30–£55/m². Note: removing existing pebbledash is labour-intensive (£8–£20/m² additional) and often damages the substrate.
External Wall Insulation (EWI) with Render
The most thermally effective option: rigid insulation boards (EPS, PUR, or mineral wool) are mechanically fixed and adhesive-bonded to the wall, then a basecoat, mesh, and silicone finish are applied. Wall U-values can be reduced from 1.5–2.0 W/m²K (uninsulated solid brick) to 0.25–0.30 W/m²K with 100 mm EPS, meeting current Part L targets. Cost: £80–£130/m² installed. EWI is eligible for grants under the Great British Insulation Scheme (GBIS) and ECO4 for qualifying households.
Cost Breakdown: What You’re Paying For
| Cost Element | % of Total Job | Notes |
|---|---|---|
| Scaffold | 12–20% | Reduced if self-erecting or using tower sections |
| Preparation (crack repair, key coat, removal of old render) | 10–20% | Major variable — old render can add significantly |
| Materials (render systems, mesh, beads) | 25–35% | Higher for EWI (insulation board cost) |
| Labour (plasterers, day rate £220–£320/day, 2026) | 35–45% | Major UK regional variable |
| Drip beads, expansion beads, reveals | 3–7% | Often underquoted; required at all openings |
Day Rates and Labour Costs
Experienced external renderers charge £220–£320 per day in most of England (2026), with specialist silicone or EWI operatives in London reaching £320–£400/day. A two-coat sand-and-cement render on a semi takes approximately 5–8 operative-days; monocouche or silicone (which require less material prep but more precise application) take 6–10 days including base coat curing time.
Planning and Building Regulations
Planning Permission
In most cases, re-rendering an existing house like-for-like does not require planning permission — it is considered maintenance. However:
- In a conservation area, changes to external materials and colour may require planning consent even for like-for-like work
- Article 4 Directions in some areas remove PD rights for external alterations
- Listed buildings require Listed Building Consent for any changes to external appearance, including render type or colour
If you are changing from brick (no render) to rendered, or from one render colour to another in a conservation area, consult the LPA before work begins.
Building Regulations
EWI systems require building control notification under Regulation 12 (Material Alteration) where the work affects the thermal performance of the building fabric. Local authority building control or an approved inspector should be notified, particularly if the work is grant-funded (ECO4 / GBIS schemes require compliance certification). Like-for-like render replacement without insulation does not typically require Building Regs notification.
Common Problems and How to Avoid Them
Cracking — caused by applying cement render too rigidly, inadequate key coat adhesion, or insufficient expansion joints. Silicone and monocouche renders are significantly more crack-resistant than sand-and-cement; expansion joints should be specified every 6–8 m on large walls.
Algae and staining — north- and east-facing elevations are most prone; specify hydrophobic and biocide-treated renders. Silicone render performs best here.
Delamination — render pulling away from the wall, usually because the substrate was not properly prepared (loose plaster, contamination, dusty surface) or because damp was present during application.
Efflorescence — white salts leaching through the surface; common on sand-and-cement over previously wet walls. Ensure the building is dry before application.
Getting Accurate Quotes
When obtaining quotes, ask contractors to specify:
- Render system by name and manufacturer (not just “monocouche” or “silicone”)
- Number of coats and minimum thicknesses
- Whether scaffold is included
- Preparation scope (what cracking and previous render removal is included)
- Warranty: most quality render systems carry a 10–25 year manufacturer warranty when applied by a registered installer
Three competitive quotes for a whole-house render job are standard; prices can vary by 30–50% for the same specification between contractors, so comparing like-for-like on the system specification is essential.
