Cavity wall grant guides and rules
SEAI pays a fixed cavity wall insulation grant: €1,800 for a detached house, €1,300 for a semi-detached or end-of-terrace house, €850 for a mid-terrace house, €700 for an apartment. Homeowners on certain welfare payments, and landlords with a HAP or RAS tenant, get the higher rate: €2,300, €1,700, €1,100 and €900.
Every guide on this site: grant amounts by house type, eligibility rules, costs after the grant, BER assessments and how to apply.
Free, no obligation. One registered installer prices it, not five.
- 16grant & cost guides
- 26counties compared
- 15technical glossary terms
- €1,800top detached grant
Guides to rules, costs and applying
Step-by-step guides to qualifying, applying, stacking with the attic grant, and avoiding refused claims.
Check your cavity wall grant
Four quick taps. You see your grant as you go, then what the job typically costs after it, the BER and your next step. Your number is only asked for at the end, if you want a price.
A semi-detached built before 2011, no earlier wall grant: a €1,300 grant, and the job typically costs €1,585, so about €285 is left to pay.
How this is worked out
SEAI pays a fixed cavity wall grant for each house type, and a higher fixed amount to homeowners on certain welfare payments and to landlords with a HAP or RAS tenant. The typical cost is the median price of cavity wall insulation for your house type across thousands of grant-funded jobs, and the post-works BER is its median price less its own grant. Your installer prices your walls after a look: it's a guide to plan with, never a quote. SEAI decides every grant.
Your grant, by home and by route
The house type sets the grant. The route sets who applies and when you're paid.
Detached house€1,800, or €2,300 on the higher rate. The biggest grant, for the most wall.
Semi-D or end of terrace€1,300, or €1,700 on the higher rate, which covers the typical cost.
Mid-terrace house€850, or €1,100 on the higher rate. Two outside walls to fill.
Apartment€700, or €900 on the higher rate, and who applies in a block.
Landlords: HAP and RASThe higher rate for a let home with a HAP or RAS tenant, and the landlord deduction.
The higher rateMore for homeowners on certain welfare payments, without losing a place for free upgrades.
Free upgradesFully funded work for homes built before 2006 whose owners get certain payments.
One Stop Shop routeOne company applies, manages the work and takes the grant off your bill.What to check before applying
Every guide on this site follows SEAI scheme rules for Irish homes built and occupied before 2011. Before your installer drills a test hole or orders bead, check three essentials:
- MPRN approval first: Your SEAI Letter of Offer must be in place before any work starts on site.
- All outside walls filled: Partial jobs on one wall or an extension alone do not qualify under SEAI rules.
- Post-works BER booked: A registered BER assessor must lodge the new certificate after the walls are pumped.
Related 2026 Ireland Specialist Cost & Technical Guides
Cross-referenced Irish pricing benchmarks, SEAI/Revenue grant rules, and county specifications from partner reference hubs:
- Wall Insulation Grants (wallinsulationgrants.ie) — 2026 Ireland Cost & Spec Guides: The three SEAI wall insulation grants side by side for Irish homes: cavity (EUR 700-1,800, higher rate up to EUR 2,300 for certain welfare recipients
- External Insulation Grant (externalinsulationgrant.ie) — 2026 Ireland Cost & Spec Guides: The SEAI external wall insulation grant (EUR 8,000 detached, 6,000 semi-D or end of terrace, 3,500 mid-terrace, 3,000 apartment) against the visitor's
- Midland Insulation (midlandinsulation.ie) — 2026 Ireland Cost & Spec Guides: Home insulation and SEAI insulation grants across the Irish Midlands (Laois, Offaly, Westmeath, Longford, Roscommon, Kildare, Tipperary and Meath) and
- Window Grants (windowgrants.ie) — 2026 Ireland Cost & Spec Guides: Guide to the SEAI windows and doors grant in Ireland (opened 2 March 2026): amounts by house type, eligibility including the BER Heat Loss Indicator,
- Windows Grant (windowsgrant.ie) — 2026 Ireland Cost & Spec Guides: Getting an Irish home ready for the SEAI windows and doors grant (windows EUR 4,000 detached, 3,000 semi-D or end of terrace, 1,800 mid-terrace, 1,500
Cavity Wall Insulation Grants guides & price breakdowns
Straight answers to what people ask most: itemised costs, specifications, planning or grants, and what to check before you book.
More guides & resources: The BER after cavity wall insulation · Had a wall grant before? The second wall measure · All guides & calculator hub · Technical & trade glossary · Frequently asked questions · All areas covered
Questions people ask
How much is the cavity wall insulation grant?
SEAI pays a fixed cavity wall insulation grant: €1,800 for a detached house, €1,300 for a semi-detached or end-of-terrace house, €850 for a mid-terrace house, €700 for an apartment. Homeowners on certain welfare payments, and landlords with a HAP or RAS tenant, get the higher rate: €2,300, €1,700, €1,100 and €900.
Who qualifies?
The home must have an MPRN and have been built and first lived in before 2011, with no earlier SEAI wall grant on that MPRN. You must own it (owner-occupiers, landlords, holiday home owners and management companies can apply), every outside wall must be insulated, the installer must be SEAI-registered for cavity wall insulation, and you must have grant approval before any work starts.
Cavity Wall Insulation Grants across all 26 counties
Requests from all 26 counties go to one vetted local specialist who covers your county — from Dublin, Cork, Galway and Limerick to Kildare, Meath, Wicklow, Waterford and Donegal. Pick your county below for local prices, specifications and advice. Compare all areas covered →
Check your cavity wall grant
Four taps to your grant and what's left to pay, then one SEAI-registered installer who covers your county rings with a price.