How Much Does Spray Foam Insulation Cost in Ireland? (2026 Price Guide)

Spray foam is the insulation people ask the most questions about — it seals gaps nothing else can reach, but it costs more than conventional insulation and isn’t right for every home. Here’s exactly what it costs in Ireland in 2026, where it earns the premium, and where a cheaper material does the same job.

Quick answer: spray foam insulation in Ireland costs €25 – €60 per square metre installed for general and wall applications, and €50 – €100 per m² for attic and roof-level work. A full attic job typically comes to €3,000 – €10,000+ depending on roof size and foam type.

Spray Foam Insulation Cost Per Square Metre

Open cell vs closed cell

The two foam families sit at opposite ends of those ranges. Open-cell foam is lighter and cheaper, with good thermal and acoustic performance — it’s what keeps most jobs near the lower end. Closed-cell foam is denser, insulates more per centimetre and adds a moisture barrier, which pushes the price toward the top of the range. The right choice depends on your roof build-up and ventilation — we recommend at the survey, not before.

Spray Foam Attic Costs by Size

For attic and roof-level work — the job spray foam is most often quoted for — here’s what the per-m² rates mean in practice, next to the cheaper conventional option:

Roughly double the price of mineral wool — the honest comparison. Spray foam earns the difference when you need the roof itself insulated (a warm attic for storage or conversion) or an airtight seal over awkward, gappy structures. If you just need a cold attic floor topped up, mineral wool wins — see the full comparison in our attic insulation cost guide.

What Changes the Price of a Spray Foam Job?

• Foam type and thickness — closed-cell at depth costs the most; open-cell at standard depth the least.
• Roof-level vs ceiling-level — spraying the rafters covers more area at a higher rate than a ceiling job.
• Access and roof complexity — dormers, valleys and tight eaves slow the crew down.
• Removing old insulation — damp or compressed material should come out before spraying.
• Ventilation detailing — spray foam changes how a roof breathes; card vents and airflow paths must be done right, or condensation follows. It’s why ventilation after insulating matters more with foam than with any other material.

Things to Know Before Choosing Spray Foam

Spray foam is permanent, needs professional installation, and — worth saying plainly — can complicate future roof inspections and repairs, since the foam bonds to the underside of the roof. Done right, with the correct foam and ventilation detailing, it delivers outstanding airtightness and thermal performance for decades. Done wrong, it’s expensive to undo. That’s the real reason to use an experienced installer rather than the cheapest quote — and why every one of our spray foam insulation jobs starts with a free survey rather than a price over the phone.

SEAI grant applications for attic insulation rose 81% year on year in early 2026; our SEAI grant statistics list every current value.

Grants for Spray Foam Insulation

There’s no spray-foam-specific SEAI grant, but attic insulation jobs — including spray foam where it’s the appropriate specification — can qualify under the SEAI attic insulation grant of €800 – €1,500 (by house type, homes built before 2011). Eligibility depends on the spec meeting SEAI requirements, so we confirm your exact grant position at the survey and handle the paperwork if you qualify.