Internal Wall Insulation (Dry-Lining) Across the Midlands: Costs & €4,500 SEAI Grant
When a house has a natural stone facade, heritage brick front, or narrow side passage where 100mm external boarding cannot fit, Internal Wall Insulation (dry-lining) achieves the SEAI 0.27 W/m²K target from the inside at a lower capital cost.
Internal Dry-Lining Prices & SEAI Grants (2026)
To claim the SEAI Internal Wall Insulation grant, all external walls of the property must be insulated to ≤ 0.27 W/m²K (including window reveals, radiator pipe extensions, skirting refit, and full gypsum skim coat).
| Property Type | Gross Supply, Fit & Skim Cost | 2026 SEAI Grant | Net Cost After Grant | Board Spec |
|---|---|---|---|---|
| Apartment | €4,800 – €6,800 | −€1,500 | €3,300 – €5,300 | 70mm–82.5mm PIR + Vapour Layer |
| Mid-Terrace House | €6,500 – €9,200 | −€2,000 | €4,500 – €7,200 | 70mm–82.5mm PIR + Skim |
| Semi-Detached or End-Terrace | €9,500 – €13,500 | −€3,500 | €6,000 – €10,000 | 82.5mm PIR / Phenolic + Skim |
| Detached House or Bungalow | €12,500 – €17,500 | −€4,500 | €8,000 – €13,000 | 82.5mm–92.5mm PIR + Skim |
Can You Combine Cavity Pumping or External Wrap with Internal Dry-Lining?
Yes — many older Midlands homes have an original stone or solid-block cottage at the front and a 1980s cavity-block extension at the back. Under SEAI S.R. 54 design rules, each wall type is treated with its appropriate system while ensuring continuous thermal overlap at junctions.
Frequently Asked Questions: Internal Dry-Lining
Can I dry-line just one cold bedroom and claim the SEAI grant?
No — SEAI requires all external walls of the habitable dwelling to reach a U-value of 0.27 W/m²K or better to release the grant.
Do radiators and electrical sockets on external walls have to be moved?
Yes — radiators, curtain poles, window boards, skirting boards, and socket back-boxes on external walls are brought forward by the thickness of the insulated board (~85mm) and re-commissioned before skimming.
Related Services & Guides
- Pumped Bonded-Bead Cavity Wall Insulation — €400–€1,200 net after grant
- 300mm Attic Insulation, Raised Walkways & SEAI Grants — €600–€1,500 net after grant
- External Wall Insulation (The Wrap) & €8,000 SEAI Grant — Up to €8,000 SEAI Grant
- Spray Foam Insulation Removal & Compliant 300mm Re-Insulation — Mortgage & BER Compliant
- Complete 2026 SEAI Home Insulation Grant Matrix & Rules — Up to €11,050 Combined
Areas Covered
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