Home Insulation & SEAI Grants in Longford: Cavity Wall, Attic & External Wrap
Compare gross prices, fixed 2026 SEAI grant deductions, and net homeowner costs for pumped cavity wall insulation, 300mm attic insulation, and external wall wrap across Longford (Longford Town, Ballymahon, Edgeworthstown, Granard, Lanesborough, Drumlish).
2026 Home Insulation Prices & SEAI Grants in Longford
Every job is carried out by an SEAI-registered contractor using NSAI Agrément certified materials under S.R. 54, including full roof-ventilation compliance and a post-works BER assessment (with an extra €50 SEAI BER grant).
| Insulation Measure & House Type | Gross Price (incl. 13.5% VAT) | 2026 SEAI Grant | Net Homeowner Cost | Target U-Value |
|---|---|---|---|---|
| Cavity Wall Pump — 3-Bed Semi-D / End-Terrace | €1,600 – €2,100 | −€1,200 | €400 – €900 | 0.55 W/m²K |
| Cavity Wall Pump — 4-Bed Detached / Bungalow | €2,200 – €2,900 | −€1,700 | €500 – €1,200 | 0.55 W/m²K |
| 300mm Attic Insulation — Semi-D (Rafters + Tank + Hatch) | €1,900 – €2,450 | −€1,300 | €600 – €1,150 | 0.16 W/m²K |
| 300mm Attic Insulation — Detached Bungalow / 2-Storey | €2,300 – €3,100 | −€1,500 | €800 – €1,600 | 0.16 W/m²K |
| Cavity + Attic Combined Bundle (Semi-D) | €3,500 – €4,400 | −€2,500 | €1,000 – €1,900 | Wall 0.55 / Roof 0.16 |
| Cavity + Attic Combined Bundle (Detached) | €4,500 – €5,800 | −€3,200 | €1,300 – €2,600 | Wall 0.55 / Roof 0.16 |
| External Wall Wrap (100mm EPS + Silicone Render, Semi-D) | €16,500 – €21,500 | −€6,000 | €10,500 – €15,500 | 0.27 W/m²K |
| External Wall Wrap (100mm EPS + Silicone Render, Detached) | €22,000 – €29,500 | −€8,000 | €14,000 – €21,500 | 0.27 W/m²K |
Housing Stock & Insulation Upgrades in Longford
Across Longford (Longford Town, Ballymahon, Edgeworthstown, Granard, Lanesborough, Drumlish), housing stock consists heavily of high share of pre-2006 detached bungalows eligible for the €1,700 cavity + €1,500 attic seai grant bundle. Under 2026 SEAI Better Energy Homes rules, any dwelling built and occupied before 2011 (based on ESB MPRN connection date) qualifies for fixed cash grants covering cavity wall pumping, 300mm attic insulation, internal dry-lining, and external wall insulation ("The Wrap").
Why Combining Cavity Wall + Attic Insulation Is the Fastest Payback in Longford
An uninsulated 100mm masonry cavity loses roughly 30%–35% of your home's heat, while an attic with only 75mm–100mm of old flattened glass wool loses another 25%–30%. When you book both measures together in Longford:
- A 3-bed semi-detached homeowner claims €1,200 (cavity) + €1,300 (attic) + €50 (BER grant) = €2,550 in SEAI grants, leaving a typical net balance of just €1,000 to €1,850.
- A detached house or bungalow homeowner claims €1,700 (cavity) + €1,500 (attic) + €50 (BER grant) = €3,250 in SEAI grants, leaving a net balance of €1,300 to €2,550 and typically saving €750 to €1,150 every winter on kerosene oil or gas.
Longford Frequently Asked Questions
How much does cavity wall and attic insulation cost after grants in Longford?
In Longford, a combined cavity wall pump and 300mm attic insulation upgrade typically costs €1,000 to €1,900 net for a 3-bed semi-detached house (after €2,500 in SEAI grants) or €1,300 to €2,600 net for a 4-bed detached house or bungalow (after €3,200 in SEAI grants).
How long does cavity wall and attic insulation take in Longford?
Both pumped bonded-bead cavity wall insulation and a 300mm mineral wool attic upgrade are normally completed in a single day with zero internal plaster disruption.
What if my house in Longford is built from hollow blocks or solid concrete?
Hollow-block or solid concrete walls cannot be pumped with bead; instead, they qualify for the SEAI External Wall Insulation Grant (€3,500 mid-terrace, €6,000 semi-D, €8,000 detached) or Internal Dry-Lining Grant (€2,000 to €4,500).
Specialist Guides & Nearby Areas
- 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
- Internal Wall Insulation (Dry-Lining) & €4,500 SEAI Grant — €1,500–€4,500 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
Nearby Areas Covered
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