The SEAI deep retrofit grant is one of the largest home improvement grants in Europe — offering Irish homeowners up to €50,000 to completely upgrade their home's energy performance. Here's everything you need to know about it in 2026.
A deep retrofit is a comprehensive energy upgrade that brings a home from a low BER rating (typically D, E, F or G) to a BER of B2 or better. It typically involves multiple measures carried out together — insulation, heat pump, solar panels, ventilation and heating controls — rather than individual upgrades.
💡 A deep retrofit can cut heating bills by 60–80% and dramatically improve home comfort. Many older Irish homes currently spend €3,000–€5,000 per year on heating. After a deep retrofit, this can drop to under €1,000.
The deep retrofit grant covers up to 50% of the total cost of eligible works, to a maximum of €50,000. The exact amount depends on the starting BER rating and the measures installed:
SEAI's One Stop Shop scheme is the primary route for deep retrofits in Ireland. A registered One Stop Shop provider manages the entire project — from initial assessment through to grant application, contractor coordination and final sign-off. You deal with one company rather than managing multiple contractors yourself.
The One Stop Shop fee is included in the overall grant calculation — you don't pay it separately.
A full deep retrofit typically takes 8–16 weeks on site, depending on the measures involved. The application and approval process adds 4–8 weeks before work can start. Total timeline from first enquiry to completion is typically 4–6 months.
For homes with a BER of D or below, a deep retrofit almost always makes financial sense. The combination of reduced energy bills, increased property value and the SEAI grant makes the net cost very manageable — often €15,000–€25,000 after grants for a full whole-house upgrade.
SEAI Leads helps SEAI registered deep retrofit contractors and One Stop Shop providers get more enquiries online.
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