When is External Wall Insulation Suitable?

What Is External Wall Insulation?

External Wall Insulation (EWI) involves fixing insulation boards to the outside of your home and applying a protective render finish.

It improves thermal performance, reduces heat loss through walls, and can modernise the appearance of older properties.

In many Irish homes — especially those built before modern insulation standards — walls are a major source of heat loss.

Homes That Are Often Suitable

External Wall Insulation is commonly suitable for:

Solid Wall Homes

Many homes built before the 1980s have solid block or concrete walls with little or no insulation. These properties often benefit most from EWI.

Homes With Poor BER Ratings

If your home has a lower BER and high heating costs, external insulation may form part of a structured upgrade plan.

Properties Without Cavity Walls

If there’s no cavity to pump insulation into, external insulation can be the appropriate solution.

Homes Undergoing Renovation

If you’re already improving windows, heating, or roofing, it can be practical to address wall insulation at the same time.