The BER after cavity wall insulation
Every cavity wall grant claim needs a post-works BER, done by an assessor on SEAI's register after the work. It typically costs €245 to €280, SEAI pays €50 towards it, and the assessor signs the Declaration of Works with you and the installer.
Why the grant needs one, what it costs, and what it does for the house.
Free, no obligation. One registered installer prices it, not five.
- €245–€280typical cost of the BER
- €50BER grant from SEAI
- Afterthe work, not before
- 3signatures on the Declaration
What the BER is for
A Building Energy Rating rates the home from A to G. For the grant, it shows SEAI the work was done, and it gives the home a new rating that reflects the filled walls. The assessor signs the Declaration of Works with you and the installer, which is how you claim.
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.
What it costs
| Home type | Typical BER | After the €50 grant |
|---|---|---|
| Detached | €280 | about €230 |
| Semi-D or end of terrace | €280 | about €230 |
| Mid-terrace | €275 | about €225 |
| Apartment | €245 | about €195 |
Book it right
- Use an assessor on SEAI's National Register of BER assessors.
- Book it after the installer has finished.
- Leave time inside the 8 months for the BER and the forms.
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
Do I need a BER for the cavity wall grant?
Yes. Every claim needs a post-works BER by a registered assessor.
How much is a BER?
Typically €245 to €280, and SEAI pays €50 towards it.
Can I use an old BER?
No. The grant needs a BER done after the work.
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.