Exterior wall insulation cost Netherlands 2026

Quick answer

Exterior wall insulation in the Netherlands costs € 80–€ 200 per m² including materials and installation in 2026. For an average terraced house (70 m² of façade): € 6,000–€ 14,000. Cavity wall injection (spouwmuurisolatie) is much cheaper at € 15–35/m².

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Cost per insulation method

| Method | Cost per m² | Rc value | Best for | |---|---|---|---| | Cavity wall injection (blown) | € 15–€ 35/m² | +1.5–3.0 m²K/W | Existing cavity ≥ 6 cm | | External insulation board (EPS/mineral wool) | € 90–€ 160/m² | Rc ≥ 3.5 m²K/W | No existing cavity | | Cladding system with insulation | € 120–€ 200/m² | Rc ≥ 3.5 m²K/W | Renovation + aesthetics | | Internal insulation (damp cavity) | € 30–€ 60/m² | +1.0–2.0 m²K/W | Emergency fix only |

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Whole-house costs

| Property type | Façade area | Cavity wall | External insulation | |---|---|---|---| | Terraced house | 50–70 m² | € 800–€ 2,500 | € 5,000–€ 11,000 | | Corner / semi-detached | 80–110 m² | € 1,200–€ 3,800 | € 8,000–€ 18,000 | | Detached house | 120–180 m² | € 1,800–€ 6,300 | € 11,000–€ 29,000 |

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Permit requirements (Bbl)

Permit-free:

• Cavity wall injection (no visible change)
• Thin render coat (≤ 5 cm) that stays within the plot boundary

Omgevingsvergunning required:

• External cladding or thick external insulation (> 5 cm) that extends beyond the plot boundary
• Change of façade colour or material in a protected townscape
• Always for listed buildings (rijksmonument / gemeentelijk monument)

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ISDE subsidy 2026

| Measure | Subsidy | Required Rc | |---|---|---| | Wall insulation (external or cavity) | € 27/m² | Rc ≥ 3.5 m²K/W | | Max. per home | € 1,500 | — |

Apply via RVO.nl before works start. A recognised contractor (KOMO certified) is required.

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Payback period

| Scenario | Annual saving | Payback | |---|---|---| | Cavity wall injection (terraced house) | € 400–€ 700/year | 3–5 years | | External insulation board (terraced house) | € 500–€ 900/year | 8–16 years |

Cavity wall injection has the shortest payback of all insulation measures — often under 5 years.

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Conclusion

Exterior wall insulation costs € 80–€ 200/m² in the Netherlands in 2026 (or just € 15–35/m² for blown cavity wall injection). ISDE covers up to € 1,500 per home. A permit is needed when the façade appearance changes or the insulation extends over the plot boundary.

archi.sulerr.com handles the permit application and architectural drawings for façade insulation projects that require an omgevingsvergunning, including welstand material descriptions.