EWI Costs, Savings & Payback in Ireland (2025): What to Expect
External Wall Insulation (EWI)
Did you know that approximately 35–40% of your home’s heat and energy bills can be lost through your walls? By externally insulating your property, you can cut heat loss dramatically and make EWI the cornerstone of a B2-targeted retrofit. Here’s how to think about costs, savings, and payback in 2025.
What drives cost?
- Wall area & house type: More area = more material and labour.
- Complexity: Eaves, pipework, meter boxes, and detailing time.
- Finish choice: Acrylic, Silicone, Dry Dash, Wet Dash, and Brick Slip.
How savings stack up
EWI significantly reduces conductive losses through walls. Combine with attic insulation, airtightness, and heating controls to amplify both savings and comfort. Expect the biggest bill reductions in wind-exposed locations and homes with poorly insulated solid walls.
Indicative payback
Post-grant payback is typically mid-term; exact figures depend on fuel type, occupancy, and energy prices. Always request a survey-based model with before/after U-values to see expected performance improvements.
ROI tips
- Choose NSAI-certified systems and SEAI-experienced installers.
- Address window reveals and thresholds to avoid cold bridges.
- Include a ventilation strategy to protect indoor air quality.