How official grant values are handled
For each measure, HomeGrants.ie uses the live SEAI grant page as the primary source for the official grant value and the broad rules that govern that measure.
Methodology
How HomeGrants.ie calculates its figures
HomeGrants.ie separates official grant values from guidance figures. Official grant values are taken from live SEAI grant pages. Typical homeowner-cost figures are benchmark estimates designed to help homeowners understand the likely order of magnitude before they seek a quote.
Official grant values: sourced from live SEAI grant pages for the relevant measure or grant route.
Typical cost to you: a guide estimate that aims to show the likely homeowner contribution after the grant, not a formal quote.
Review rule: figures are reviewed against official sources first, then against any benchmark data used for homeowner-cost guidance.
How typical homeowner-cost figures are handled
Where SEAI publishes a current individual-measure median cost, HomeGrants.ie uses that median. As of March 2026, that covers attic insulation, wall insulation, heat pumps and solar PV. The latest published SEAI median-cost PDF is based on works completed from January to June 2025. SEAI has not yet published a matching windows-and-doors median-cost table, so windows and doors are shown as a clearly labelled guide range rather than as an official SEAI median. Those guide ranges are informed by current Irish price guides and installer package pages listed on the sources page.
Why house type is used
Detached, semi-detached, mid-terrace and apartment homes can have very different cost profiles. House-type guidance helps make the figures more realistic without pretending to be a quote.
Why some figures are ranges
Some upgrade packages vary too much to present as one universal number. In those cases, a range is more honest than a precise figure that could mislead the homeowner.
How bundled grants are handled
Some official grants are bundles rather than one flat amount. For example, the 2026 heat pump grant has a maximum value, but the full bundle depends on the contractor design and the existing heating system. In those cases, HomeGrants.ie shows the official maximum grant and uses a homeowner-cost range where that is the more honest presentation.
What the figures are meant to do
- Show whether an upgrade usually feels like hundreds, thousands, or a larger capital decision.
- Help the homeowner compare options before taking calls from installers.
- Improve lead intent by reducing surprise at the final step.
What the figures are not meant to do
- Replace installer quotes.
- Promise grant approval.
- Pretend every home of the same type has the same cost profile.
To see the official source set used across the site, visit the sources page. To understand how pages are reviewed and updated, visit the editorial policy.