External wall insulation cost per m² in Ireland (2026), including installation scope, VAT treatment, scaffolding impact and key structural cost drivers.
1. Overview
External wall insulation (EWI) in Ireland typically ranges between:
€120 – €230 per m² (installed, incl. 13.5% VAT)
Variation arises from:
Insulation type
Board thickness
Render system
Access requirements
Scaffolding scope
Detailing complexity
Wall condition
Cost per m² is the primary pricing method used by contractors, but the final total depends on total wall surface area and site factors.
2. Typical Installed Cost Ranges (2026)
| System Type | Typical Installed Cost per m² (Incl. 13.5% VAT) |
|---|---|
| Budget EPS (80–100mm) | €120 – €145 |
| Mid-Range EPS (100–120mm) | €145 – €180 |
| Mineral Wool System | €160 – €200 |
| High-Spec Phenolic / Premium Finish | €180 – €230 |
Most semi-detached houses fall within:
€150 – €175 per m²
3. What the Per m² Price Commonly Includes
External insulation installation typically includes:
Insulation boards
Adhesive and mechanical fixings
Reinforcement mesh
Base coat
Primer
Silicone or acrylic render finish
Standard labour
Basic detailing around windows and doors
It typically excludes:
Scaffolding
Structural crack repair
Window sill replacement
Roof overhang extensions
Rainwater goods replacement
Scope alignment is essential when comparing per m² rates.
4. Material Cost Breakdown per m² (Ex VAT)
| Component | Typical Range (Ex VAT) |
|---|---|
| EPS Board (100mm) | €40 – €50 |
| Mineral Wool Board | €55 – €70 |
| Fixings & Adhesive | €10 – €15 |
| Base Coat & Mesh | €15 – €20 |
| Finish Render | €18 – €25 |
Material cost alone typically ranges:
€83 – €130 per m² (ex VAT)
Labour and contractor overhead account for the remainder.
5. Labour Component per m²
| Labour Element | Typical Range (Ex VAT) |
|---|---|
| Board installation | €20 – €30 |
| Base & mesh application | €10 – €15 |
| Finish coat application | €8 – €12 |
| Detailing & sealing | €7 – €12 |
Total labour (ex VAT):
€45 – €69 per m²
Labour increases where:
Wall surfaces are uneven
Multiple window openings exist
Architectural detailing is complex
Height exceeds standard two-storey access
6. Scaffolding Impact on Per m² Cost
Scaffolding is often priced separately.
Typical scaffold cost (full perimeter, two-storey semi):
€2,000 – €3,500
When distributed across wall area:
| Wall Area | Scaffold Cost | Effective Addition per m² |
|---|---|---|
| 100m² | €2,500 | €25 |
| 140m² | €2,500 | €18 |
| 180m² | €3,500 | €19 |
Smaller homes carry a higher per m² scaffold burden.
7. Wall Area and Total Project Examples
3-Bed Semi (110m² external wall area)
Assumed rate: €160 per m²
110 × €160 = €17,600
Contingency (7%): €1,232
Total allowance: €18,832
Detached House (180m² wall area)
Assumed rate: €175 per m²
180 × €175 = €31,500
Contingency (7%): €2,205
Total allowance: €33,705
Small Bungalow (85m² wall area)
Assumed rate: €140 per m²
85 × €140 = €11,900
Contingency (7%): €833
Total allowance: €12,733
8. Insulation Thickness and Cost Impact
| Thickness | Typical U-Value Improvement | Cost Impact |
|---|---|---|
| 80mm EPS | Moderate | Baseline |
| 100mm EPS | Improved | +€5 – €10/m² |
| 120mm EPS | Strong | +€10 – €20/m² |
| 140–150mm Mineral / Phenolic | High | +€20 – €40/m² |
Higher thickness increases:
Material cost
Reveal detailing labour
Extended fixings
9. VAT Treatment
For qualifying residential renovation:
Installation labour: 13.5% VAT
Materials supplied & installed: 13.5% VAT
Retail material-only purchase: 23% VAT
Professional services (e.g., BER assessment): 23% VAT
On a €20,000 insulation project:
13.5% VAT portion = €2,700
VAT structure should be confirmed when comparing quotes.
10. Regional Variation (Ireland)
External wall insulation costs may vary:
5% – 15% regionally
Higher pricing commonly occurs in:
Dublin
Commuter belt counties
However, specification level remains the dominant driver.
11. Common Cost Drivers
Primary variables affecting per m² rate:
Insulation material type
Board thickness
Render system selection
Scaffolding duration
Window reveal depth
Surface preparation required
Weather delays
Programme complexity
Complex façades increase labour intensity significantly.
12. Typical 2026 Cost Summary
External wall insulation cost per m² in Ireland typically ranges:
€120 – €230 per m² (incl. VAT)
Most standard semi-detached properties fall between:
€150 – €175 per m²
Total project budgets commonly range:
€12,000 – €35,000
depending on wall area and specification.
Per m² pricing provides a useful benchmark, but final cost depends on scope alignment, access, and detailing complexity.
13. Other Resources
Internal vs External Cost Comparison