How to apply for the cavity wall grant
Apply online with your MPRN, the installer's name and SEAI ID, the house type and the year it was built and first lived in. Online applications are usually approved within minutes. Accept the offer within 30 days, have the work done and the post-works BER within 8 months, sign the Declaration of Works with the assessor and the installer, and send it with the Request for Payment form. SEAI usually pays in 4 to 6 weeks.
The steps in order, what to have ready, and how long each stage takes.
Free, no obligation. One registered installer prices it, not five.
- Minutesonline approval, usually
- 30 daysto accept the offer
- 8 monthsto finish and claim
- 4–6 weeksfor SEAI to pay
Step by step
- Get a quote from an SEAI-registered installer. You need their name and SEAI ID for the application. SEAI's advice: shop around for quotes, and get a written contract with the works, prices, timing, payment terms and warranties.
- Apply. Online with your MPRN, the installer's details, the house type, the grants you're applying for and the year built and first lived in. By post, the offer comes within 5 working days.
- Accept the offer within 30 days, or apply again. With it come the Declaration of Works and the Request for Payment form.
- Book the work. Only now. Every outside wall is filled.
- Post-works BER. A registered BER assessor rates the home after the work. SEAI pays €50 towards it.
- Sign and send. You, the assessor and the installer sign the Declaration of Works. Send it with the Request for Payment form, and a Tax Clearance Certificate if you got more than €10,000 in grants in the calendar year.
- Get paid. Usually 4 to 6 weeks after SEAI has the forms. SEAI may inspect, and if anything needs redoing, the installer comes back and payment waits.
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.
Have these ready
- Your MPRN: the 11-digit number on your electricity bill
- The installer's name and SEAI ID
- The house type and the year built and first lived in
- For the higher rate, proof of the payment, or of the HAP or RAS tenancy
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 do I apply for the cavity wall grant?
Apply online with your MPRN, the installer's name and SEAI ID, the house type and the year it was built and first lived in. Online applications are usually approved within minutes. Accept the offer within 30 days, have the work done and the post-works BER within 8 months, sign the Declaration of Works with the assessor and the installer, and send it with the Request for Payment form. SEAI usually pays in 4 to 6 weeks.
How long does approval take?
Online applications are usually approved within minutes. Postal applications get an offer within 5 working days.
How long do I have to do the work?
8 months from the date of the grant offer to finish the work, get the BER and draw down the grant.
When is the grant paid?
Usually 4 to 6 weeks after SEAI receives the signed Declaration of Works and the Request for Payment form.
Can the installer apply for me?
On the usual route you apply yourself, with the installer's details. A One Stop Shop applies on your behalf.
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.