Wall insulation contractors in Dublin

Wall insulation in Dublin

Homes across Dublin are eligible for SEAI Better Energy Homes grants for cavity wall, external wall and dry-lining insulation. Most properties built before 2011 qualify, and there is no income test. The grant is available to all eligible homeowners regardless of income.

The contractors listed above are SEAI-registered and can advise on which type of insulation suits your property in Dublin. They handle the full SEAI grant application on your behalf, so the grant amount is deducted directly from your bill at the end of the project.

Which type of insulation suits your home?

Cavity wall insulation suits homes built after 1930 with a clear, dry cavity. It is the most affordable option and is typically completed in a single day. External wall insulation is suitable for any wall type and delivers a larger thermal improvement, but costs more and takes longer to install.

Before you call a contractor, read our cavity wall insulation guide or external wall insulation guide to confirm which type suits your home. Our SEAI grant guide explains the full process, and the 2026 cost guide covers typical prices before and after grant.

Areas covered across Dublin

The contractors listed cover all Dublin postcodes and surrounding areas. Dublin City, Swords, Blanchardstown and Lucan are among the most active areas for cavity wall insulation works, where large estates of 1970s and 1980s homes are eligible for the €1,800 cavity grant. South Dublin areas including Tallaght, Clondalkin and Dundrum have a mix of cavity and solid-wall homes, with many qualifying for the higher €8,000 external wall insulation grant. Coastal areas such as Dun Laoghaire and Blackrock tend toward older solid-wall construction, well-suited to dry-lining or external render systems.