SEAI grants for dormer bungalows in 2026
In 2026, pre-2011 detached dormer bungalows qualify for the maximum €4,000 SEAI Windows Grant (€3,000 for semi-detached dormer homes), plus up to €1,600 for two new external doors (€800 each) and up to €1,500 for roof/attic insulation.
How to combine the SEAI Windows Grant with dormer roof and cavity wall insulation grants to transform a cold 1980s–2005 dormer bungalow.
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Calculate your dormer window & insulation cost
Select whether you are replacing existing dormer windows, upgrading a whole dormer bungalow, insulating cold dormer cheeks, or building a new attic dormer.
Estimated supply & fit guide
€5,200 to €10,500
After €4,000 SEAI detached grant (if pre-2011): €1,200 to €6,500
Full dormer bungalow package (8 to 12 windows including 2 to 4 upper dormer windows) in A-rated white triple/double uPVC, supplied and fitted. Pre-2011 detached dormer bungalows meeting the SEAI Heat Loss Indicator requirement can claim the €4,000 SEAI Windows Grant (€3,000 for semi-D).
Ask a local specialist for a quote2026 SEAI grants for pre-2011 dormer bungalows
| SEAI upgrade measure | Detached dormer bungalow grant | Semi-D dormer grant | Typical gross cost (detached dormer) |
|---|---|---|---|
| New A-rated windows (all windows Uw ≤ 1.4 W/m²K) | €4,000 | €3,000 | €5,200 to €10,500 (uPVC) |
| New external doors (up to 2 doors @ €800 each) | €1,600 (€800 × 2) | €1,600 (€800 × 2) | €3,200 to €5,800 (2 doors) |
| Attic & rafter/skeiling roof insulation | €1,500 | €1,300 | €2,200 to €4,500 |
| Pumped cavity wall insulation | €1,700 | €1,200 | €2,000 to €3,500 |
| Combined windows, doors, roof & cavity grants | Up to €8,800 in grants | Up to €7,100 in grants | Brings most 1990s dormers to B2 BER |
For full window grant rules across both standalone SEAI applications and One Stop Shop packages, see our sister guides windowgrants.ie and windowsgrant.ie.
Why dormer bungalows pass the BER Heat Loss Indicator fast
On an SEAI BER assessment, a 1.5-storey dormer bungalow has a huge roof-to-wall surface ratio (flat ceiling, sloped skeiling rafters, vertical dwarf walls and dormer projections). Combining 300mm attic/skeiling insulation, insulated dormer cheeks, pumped cavity walls and 0.8–1.2 W/m²K dormer windows typically drops the house's Heat Loss Indicator (HLI) below 2.0 W/K·m² in a single week of work—unlocking both the €4,000 windows grant and heat-pump readiness.
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Questions dormer homeowners ask
Do I have to replace both the upstairs dormer windows and downstairs windows to get the €4,000 SEAI grant?
Yes. SEAI's window grant requires that all single-glazed and older double-glazed windows in the house are upgraded so the entire building envelope meets theUw ≤ 1.4 W/m²K standard (any existing modern post-2011 extension windows that already achieve ≤ 1.4 W/m²K can stay).
What year must my dormer bungalow have been built to qualify?
For the SEAI Windows and Doors Grant (via a One Stop Shop or whole-house energy upgrade), the home must have been built and occupied before 2011. For standalone individual attic and cavity wall insulation grants, the home must have been built before 2011.
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Replacing cold, draughty or rotten dormer windows?
One vetted window company covering your county inspects the dormer frames, lead apron and side cheeks, and gives you a written price.