How much does spray foam cost in Ireland? (2026 Price Guide)
Introduction to Spray Foam Insulation in Ireland
Spray foam insulation has become one of the most popular methods for upgrading attic and roof insulation in Irish homes. Unlike fiberglass rolls, spray foam expands to fill every crack, providing a seamless, airtight thermal barrier that dramatically reduces heat loss.
However, prices depend on whether you choose open-cell or closed-cell foam, and the thickness required to meet target U-values.
Average Spray Foam Costs (2026 Pricing)
Below is a breakdown of average supply and installation rates in Ireland for 2026 (VAT at 13.5% for insulation work is generally extra):
- Open-Cell Spray Foam (Rafters/Loft): €28 – €40 per square metre. This foam is breathable and flexible, making it the standard choice for residential timber roofs.
- Closed-Cell Spray Foam (Concrete/Metal structures): €48 – €65 per square metre. Highly rigid and water-impermeable, ideal for agricultural buildings, shipping containers, and crawlspaces.
Estimated Total Project Costs
For standard residential home types in Ireland, expected project ranges are:
- 3-Bed Semi-Detached Attic Floor (Flat surface insulation): €1,600 – €2,400.
- 3-Bed Semi-Detached Rafter Spray (Following roof pitch): €2,800 – €4,200.
- 4-Bed Detached Rafter Spray (Large roof line): €4,000 – €6,000+.
Key Variables Impacting the Quote
The main cost driver is **ventilation card installation**. To comply with Irish Building Regulations and prevent roof rot, a 50mm ventilation channel must be maintained behind the foam. Installing rigid vent cards adds €400 to €800 to the labor quote but is absolutely critical to protect your roof and secure mortgage approval.