External wall insulation contractors across Ireland for SEAI grant-approved retrofits, solid wall insulation, cavity wall upgrades, and render systems — covering Dublin, Cork, Galway, Limerick, and all 26 counties

Exterior wall insulation (EWI) for a standard three-bedroom semi-detached house in Ireland typically costs between €8,000 and €15,000 before SEAI grants. The SEAI Better Energy Homes scheme offers grants of up to €8,000 for solid wall external insulation, bringing the net cost significantly lower. All Ranksy-listed EWI contractors are SEAI registered and will handle the grant application on your behalf.

The SEAI Better Energy Homes scheme currently offers up to €8,000 for external wall insulation on solid-wall homes and up to €1,700 for cavity wall insulation. Additional grants are available for attic insulation, heat pumps, and solar panels when done as part of a whole-home retrofit. To qualify, your home must have been built before 2011. Your Ranksy contractor can carry out a survey and confirm your eligibility.

Ranksy has one vetted EWI contractor per county across all 26 counties of Ireland. From Dublin, Cork, and Galway to Longford, Roscommon, and Donegal — every county is covered. Check the directory to see if your county still has an open spot. Given strong grant demand, spots in some counties are filling fast.

Yes. All EWI contractors on the Ranksy network are SEAI registered, which is a legal requirement for SEAI grant work in Ireland. Only SEAI-registered contractors can submit grant applications on your behalf. Ranksy contractors are also checked for NSAI certification, which guarantees the installation meets Irish building standards.

Exterior wall insulation on a standard three-bedroom semi-detached house typically takes 5 to 10 working days, depending on wall area, access, and weather. The process involves fixing insulation boards to the external walls, applying reinforcing mesh and basecoat, then finishing with render or cladding. You can continue living in the house throughout.

A well-installed EWI system typically reduces heating bills by 30% to 50% for solid-wall homes, which are among the least efficient property types in Ireland. The SEAI estimates an average energy saving of €700 to €1,200 per year depending on the home and heating system. The improvement also raises your BER rating, which increases property value.

EWI adds 80 to 150mm to the external wall thickness and can significantly improve the appearance of a tired or dated exterior. Render finishes come in a wide range of colours and textures. If you live in a protected structure or an area with planning restrictions, your contractor will advise on what is and is not permitted before any work begins.

Cavity wall insulation fills the gap (cavity) between the inner and outer leaves of a hollow block wall, and is suitable for most homes built from the 1930s onwards. External wall insulation (EWI) is applied to the outside surface of solid walls — typically older stone or brick homes — where there is no cavity. A survey will confirm which type your home needs.