Rendering and Finish Options Cost Comparison
Rendering and finish options cost comparison for external wall insulation in Ireland (2026), including material pricing, durability differences and per m² cost impact.
Typical finish impact: €15–€50 per m², with brick slips adding €60–€100 per m²
How Finish Choice Affects EWI Cost
The external finish applied over insulation boards has a direct effect on total project cost as well as the final appearance and maintenance profile.
Finish choice influences weather resistance, longevity, crack resistance, maintenance requirements and visual appearance.
In 2026, standard render upgrades can alter installed cost by around €15–€50 per m², depending on system type.
Brick slip systems sit well above standard render pricing and are normally chosen for appearance or planning reasons rather than cost efficiency.
Common Finish Types
Acrylic: baseline cost
Silicone: +€10–€20/m²
Mineral: +€5–€15/m²
Dash / pebble: +€15–€30/m²
Brick slips: +€60–€100/m²
Silicone render is commonly selected for its balance of flexibility, moisture resistance and durability.
Acrylic vs Silicone Render
Acrylic Render
Material cost: €12–€18/m² ex VAT
Offers moderate breathability, algae resistance and flexibility.
Typical durability expectation is around 15–20 years.
Silicone Render
Material cost: €20–€30/m² ex VAT
Provides higher breathability, algae resistance and flexibility than acrylic.
Typical durability expectation is around 20–30 years.
Finish Cost & Durability Comparison
| Finish Type | Typical Installed Cost Impact | Durability Expectation |
|---|---|---|
| Acrylic render | Baseline | 15–20 years |
| Silicone render | +€10–€20/m² | 20–30 years |
| Mineral render | +€5–€15/m² | 20–25 years |
| Dash / pebble finish | +€15–€30/m² | 25–30 years |
| Brick slip system | +€60–€100/m² | 30+ years |
Dash Finish Cost Structure
| Component | Typical Range (Ex VAT) |
|---|---|
| Aggregate material | €8–€15/m² |
| Additional labour | €10–€15/m² |
| Total installed impact | +€15–€30/m² |
Brick Slip Systems
Brick slip systems typically cost €180–€280 per m² for the total system, compared with around €120–€180 per m² for standard rendered systems.
They increase material cost, installation labour and substrate preparation, and are commonly used where a brick appearance must be retained.
Colour, Texture & Maintenance
Standard colours are normally included, while premium or dark colours may add €3–€8 per m².
Textured finishes can add around 1%–3% to labour time.
Long-term repainting allowance is typically around €20–€30 per m², making lifecycle cost an important part of the choice.
Worked Cost Example — 110m² Semi-Detached
| Finish Option | Calculation | Revised Total |
|---|---|---|
| Baseline rendered system | 110 × €160/m² | €17,600 |
| Silicone upgrade | 110 × €15/m² = €1,650 extra | €19,250 |
| Brick slip upgrade | 110 × €80/m² = €8,800 extra | €26,400 |
On this example, finish selection changes the overall project cost by roughly €1,500–€9,000+.
Maintenance Intervals
| Finish Type | Typical Repaint / Maintenance Interval |
|---|---|
| Acrylic | 12–18 years |
| Silicone | 20–25 years |
| Dash | 25+ years |
| Brick slip | 30+ years |
VAT Treatment
The source page states that render and finish materials supplied and installed as part of insulation works are subject to 13.5% VAT.
Standalone retail material supply is shown at 23% VAT.
Planning Considerations
Planning may become relevant where façade appearance changes significantly, brick slips replace traditional render or a protected structure is involved.
Colour restrictions can also apply in designated areas.
Regional Variation
Finish pricing may vary by around 5%–10% regionally.
Dublin and commuter-belt labour costs can increase installation rates, while material pricing is generally more consistent nationally.
Summary
Render upgrades typically add around €10–€50 per m², while brick slip systems can add €60–€100 per m².
On a 150m² façade, that equates to roughly €1,500–€7,500 for upgraded render or €9,000–€15,000 for brick slips.
Silicone render remains the most common balance between cost, durability and maintenance.
Other resources:
Insulation Cost per Square Meter
Internal vs External Cost Comparison