The SEAI One Stop Shop deep retrofit grant offers Irish homeowners up to €50,000 for a complete whole-house energy upgrade. One SEAI-registered provider manages everything — from your initial BER assessment to project completion and grant administration — and the grant is deducted upfront so you only pay the reduced balance.
It is the largest single SEAI grant available to homeowners and the most comprehensive route to transforming an energy-hungry older home into a warm, efficient, low-cost property.
Our free grant checker tells you whether the One Stop Shop or individual grants route is better for your home.
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What Is the Deep Retrofit Grant?
The deep retrofit grant — delivered through the SEAI One Stop Shop Service — funds a comprehensive whole-house upgrade that typically includes:
- Attic and wall insulation
- Heat pump installation
- Windows and doors replacement
- Heating controls and ventilation
- BER assessment (before and after)
The goal is to bring your home to at least a BER B2 rating — the government’s standard for an energy-efficient home. Many homes achieve A3 or better after a full deep retrofit.
How Much Is the Deep Retrofit Grant?
| Grant component | Maximum |
|---|---|
| Combined insulation, heat pump, windows, controls | Up to €50,000 |
| Heat pump bonus (when included in OSS project) | €2,000 additional |
| BER assessment (pre and post) | €350 |
The actual grant amount depends on the measures included in your project and your property type. SEAI sets fixed grant amounts per measure — your One Stop Shop provider will calculate the exact total during your free assessment.
Do I Qualify for the Deep Retrofit Grant?
To be eligible for the One Stop Shop deep retrofit grant your property must:
- Be in Ireland
- Have been built and occupied before 2011
- Currently have a BER rating of B3 or lower
- Achieve at least a B2 BER rating after the works are complete
The requirement for a minimum 100 kWh/m²/year energy uplift was removed from March 2026 for projects that include a heat pump — making it easier for more homes to qualify.
How the One Stop Shop Process Works
- Free home assessment — your One Stop Shop provider visits and assesses your home’s current energy rating and what upgrades are needed
- Bespoke upgrade plan — they design a project to bring your home to at least B2
- Grant application — they apply to SEAI on your behalf
- Works completed — all upgrades are carried out by SEAI-registered contractors, typically within a few weeks
- Post-works BER assessment — confirms your home has reached the target rating
- You pay the balance only — the grant is deducted upfront. If your total project costs €60,000 and the grant is €40,000, you only pay €20,000
One Stop Shop vs Individual Grants — Which Is Better?
| One Stop Shop | Individual grants | |
|---|---|---|
| Maximum grant | Up to €50,000 | Varies, typically €15,000–€20,000 combined |
| Grant deducted upfront | Yes | No — you claim back after |
| Project managed for you | Yes — fully managed | No — you manage contractors |
| Windows and doors included | Yes | Now available standalone (March 2026) |
| Best for | Whole-house upgrades, D/E/F/G rated homes | Single measures, C/B rated homes |
Home Energy Upgrade Loan
If your retrofit costs more than the grant covers, the Home Energy Upgrade Loan provides government-backed financing from 2.99% APR, available from AIB, Bank of Ireland, PTSB, Avant Money and participating credit unions. Loan amounts range from €5,000 to €75,000 and the upgrade must be supported by an SEAI grant and achieve at least a 20% energy improvement.
Our free grant checker gives you a personalised estimate and tells you which route — OSS or individual grants — is the better fit.
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Frequently Asked Questions
What is the maximum deep retrofit grant in Ireland in 2026?
The maximum SEAI deep retrofit grant in Ireland in 2026 is €50,000 through the One Stop Shop programme. This covers insulation, heat pump installation, windows, doors, heating controls and BER assessments as part of a single managed project.
What BER rating do I need to qualify for the One Stop Shop grant?
To qualify for the One Stop Shop grant, your home must currently have a BER rating of B3 or lower. After the works are complete, your home must achieve at least a B2 BER rating. Most older Irish homes with oil or gas heating and limited insulation will easily meet the entry requirement.
How long does a deep retrofit take to complete?
The process from initial assessment to completed works typically takes 3–6 months, though this varies by provider and the complexity of the project. Most of the physical installation work is completed within 2–4 weeks.
Do I have to pay anything upfront for the One Stop Shop retrofit?
No upfront payment is required for the grant portion. Your One Stop Shop provider deducts the SEAI grant from the total project cost before you pay — you only pay the balance. For example, if the project costs €55,000 and the grant is €45,000, you pay €10,000 (which can also be financed through the Home Energy Upgrade Loan).
Can I choose my own contractor for a deep retrofit?
For the One Stop Shop route, your provider manages contractor selection — all contractors used must be SEAI-registered and approved by the One Stop Shop. For individual grant routes, you can choose any SEAI-registered contractor for each measure.
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