The cavity wall grant for a semi-D or end of terrace
A semi-detached or end-of-terrace house gets €1,300 from SEAI for cavity wall insulation, or €1,700 on the higher rate. The job typically costs €1,585, so about €285 is left to pay, or nothing on the higher rate. Every outside wall has to be insulated, and the home must have been built and first lived in before 2011.
The grant, the higher rate that covers the job, and the attic on top.
Free, no obligation. One registered installer prices it, not five.
- €1,300SEAI cavity wall grant
- €1,700the higher rate
- €1,585typical cost of the job
- about €285left to pay at the standard rate
The grant for this home
| Standard rate | Higher rate* | |
|---|---|---|
| Cavity wall grant | €1,300 | €1,700 |
| Typical cost | €1,585 | €1,585 |
| Left to pay | about €285 | €0 |
| Post-works BER, after its €50 grant | about €230 | about €230 |
* For homeowners on Fuel Allowance, Working Family Payment, One-Parent Family Payment, Domiciliary Care Allowance or Carer's Allowance (living with the person you care for), or Jobseeker's Allowance or Disability Allowance for over 6 months with a child under 7, and for landlords with a HAP or RAS tenant.
Semi-detached and end of terrace
SEAI treats both the same: three outside walls and one shared. The shared wall isn't insulated, the other three must all be. 25% of households in Ireland live in a semi-detached house (Census 2022), the estate house found in every town in the country.
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.
The higher rate covers it
On the higher rate the grant is €1,700, more than the typical €1,585 the job costs. So for a homeowner on one of the qualifying payments the insulation itself typically costs nothing. The BER after it is about €230 after its €50 grant.
Add the attic
The attic grant for a semi-D or end of terrace is €1,500, or €1,900 on the higher rate, against a typical €2,101. Both together.
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 grant for a semi-detached house?
€1,300, or €1,700 on the higher rate.
Is an end of terrace the same as a semi-D?
Yes. SEAI gives the same grant to a semi-detached and an end-of-terrace house.
What's left to pay on a semi-D?
About €285 at the standard rate, against a typical cost of €1,585. On the higher rate, nothing for the insulation itself.
Does the shared wall get insulated?
No. The grant is for the outside walls. The wall you share with next door isn't one.
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.