External wall insulation in Dublin — the house wrap, installed by us
Looking to wrap your house in Dublin? We are Isotherm — your direct Dublin external wall insulation (EWI) contractor based at Unit 20, Westlink Industrial Estate, Kylemore Road, Inchicore, Dublin 10. We install NSAI-certified Baumit external insulation systems across Dublin with our own dedicated crews, deduct up to €8,000 in SEAI grants directly from your invoice, and fit custom aluminium window sills from our sister workshop Cills.ie.
Hollow-block suburbs & coastal salt spray
Dublin has unique housing characteristics that require specialized external insulation detailing:
Tens of thousands of mid-20th century Dublin homes in Crumlin, Drimnagh, Cabra, Ballyfermot, Walkinstown, Finglas, Artane, and Tallaght were constructed with 9-inch hollow concrete blocks. These walls cannot be cavity-pumped. External wall insulation is the single most effective way to eliminate thermal bridges, eradicate black mould, and upgrade cold D/E ratings to warm A/B BER ratings.
Properties in Dún Laoghaire, Blackrock, Clontarf, Howth, Sutton, and Malahide face aggressive coastal moisture and salt air. We apply breathable Baumit SilikonTop silicone renders that resist salt crystallization, shed dirt during rainfall, and prevent algae build-up on north-facing facades.
Dublin areas where our direct crews install
Our Inchicore installation depot allows our supervisors and crews to manage jobs across all Dublin postal districts.
Blackrock
Details →Coastal silicone render & South Dublin residential wraps
Dún Laoghaire
Details →Coastal silicone render and heritage-sensitive wraps
Rathfarnham
Details →Semi-detached solid masonry thermal wraps
Dundrum
Details →South Dublin residential EWI & render upgrades
Lucan
Details →Suburban estates and one-off detached wraps
Clondalkin
Details →1970s–1980s concrete block house insulation
Tallaght
Details →Hollow block & concrete semi-detached retrofits
Swords
Details →North County Dublin residential retrofits
Grant values deducted from your Dublin invoice
Frequently asked questions in Dublin
How much does external wall insulation cost in Dublin in 2026?+
For a typical 3-bedroom semi-detached house in Dublin, external wall insulation (the wrap) costs between €13,000 and €19,000 gross. With our direct SEAI registered contractor deduction of €6,000, your net out-of-pocket cost is typically between €7,000 and €13,000. Mid-terrace Dublin homes range from €10,500 to €14,000 before the €3,500 grant deduction (net €7,000 to €10,500), while detached homes range from €18,000 to €26,000 before the €8,000 grant. Apartments receive a €3,000 grant.
Do I need planning permission for external insulation in Dublin?+
For the vast majority of suburban Dublin homes (Crumlin, Drimnagh, Ballyfermot, Cabra, Lucan, Tallaght, Dundrum, Swords), external insulation falls under exempted development. However, if your property is a Protected Structure or lies within an Architectural Conservation Area (ACA)—such as parts of Ranelagh, Rathmines, Portobello, Clontarf, or Dalkey—changing a brick facade to a rendered finish requires planning permission from Dublin City Council or Dún Laoghaire-Rathdown County Council.
Why is Baumit silicone render necessary for coastal Dublin areas?+
Coastal Dublin areas—such as Blackrock, Dún Laoghaire, Clontarf, Sutton, Howth, and Malahide—are exposed to driving maritime rain and salt spray. Standard acrylic renders can blister or attract algae under persistent coastal dampness. We apply breathable Baumit SilikonTop and NanoporTop self-cleaning silicone renders, which actively shed moisture, repel dirt, and prevent algae growth.
How long does a Dublin house wrap take on site?+
A standard Dublin semi-detached home takes 2 to 3 weeks from scaffolding erection to final render application. All work is conducted externally with zero disruption to your daily life inside.
Book your Dublin wall insulation survey
Direct crews dispatched from Unit 20 Inchicore. Fixed-price quotes with SEAI grant deducted directly from your invoice.