External Wall Insulation in County Wicklow
Protect your County Wicklow home from dampness, wind-chill, and high heating costs. Our experienced installation crews wrap your home with NSAI-certified Baumit external wall insulation and bespoke aluminium sills from Cills.ie, locking in warmth year-round — with up to €8,000 in SEAI grants deducted straight from your invoice.
County Wicklow External Wall Insulation & SEAI Grants
Projects typically start from €180 to €220. Isotherm deducts the SEAI grant directly from your invoice at source.
For homes close to the sea, we apply specialized silicone-based acrylic renders (such as Baumit SilikonTop) to withstand coastal moisture, heavy driving salt rain, and prevent algae staining.
For window cills where water runoff is high, we fit bespoke aluminium over-sills manufactured with a special protective powder coating from Cills.ie to guarantee 100% watertight drainage and long-term durability.
*Starting figures vary depending on project extras, architectural detailing, finish selection, silicone-based acrylic render requirements for sea-facing locations, and special powder coating for window cills. Fixed quotation provided after a free on-site survey.
Real project photos across County Wicklow
Every home is surveyed, scaffolded, wrapped with certified Baumit graphite EPS, and completed with custom aluminium window sills by our own direct crews.
Southern Cross & Boghall Road, Bray, Co. Wicklow
1980s 4-Bed Semi-Detached House
System: Baumit ProSystem 120mm Graphite EPS
Finish: Baumit SilikonTop 1.5mm (Chalk White 0019)
Sill Detail: Bespoke RAL 7016 Anthracite Sills by Cills.ie
BER Upgrade: E1 (332 kWh/m²/yr) → B1 (84 kWh/m²/yr)
Solid block gable and front elevation wrapped. Coastal moisture penetration eliminated; heating oil usage cut by 48%.
Charlesland & The Burnaby, Greystones, Co. Wicklow
1990s 4-Bed Detached Residence
System: Baumit OpenSystem Breathable Mineral Composite Wrap
Finish: Baumit NanoporTop Self-Cleaning Silicone (Pebble Grey 0876)
Sill Detail: Aluminium sills fabricated by Cills.ie in RAL 9005 Jet Black
BER Upgrade: D1 (250 kWh/m²/yr) → B1 (76 kWh/m²/yr)
Four exterior elevations fully wrapped. Hydrophobic silicone finish prevents salt spray staining and algae bloom.
Marlton Road & Rathnew Corridor, Wicklow Town
1970s 3-Bed End-of-Terrace Home
System: Baumit ProSystem 100mm Graphite EPS (λ 0.031)
Finish: Baumit SilikonTop 1.5mm (Oatmeal Cream 0244)
Sill Detail: Custom aluminium window over-sills with welded end caps by Cills.ie
BER Upgrade: E2 (355 kWh/m²/yr) → A3 (68 kWh/m²/yr with Attic Upgrade)
Uninsulated hollow block exterior wrapped. Severe cold draughts through bedroom walls eliminated permanently.
Baumit, Sto & Weber external insulation systems
We install full NSAI-certified external wall insulation systems engineered for coastal wind-driven rain and Irish weather extremes.
Our primary system for Wicklow homes. High-density graphite EPS (λ = 0.031) or breathable openTherm mineral boards, finished with self-cleaning Baumit SilikonTop silicone render that resists salt spray, coastal algae, and dirt.
Cement-free, highly flexible external wall insulation system with outstanding impact resistance (up to 15 Joules) and self-cleaning Lotus-Effect silicone facade finishes for high-exposure mountain and coastal properties.
NSAI-approved mineral wool and EPS insulation systems suitable for solid concrete block, stone cottages, and modern blockwork with breathable, weather-tight silicone and acrylic topcoats.
Wicklow towns & corridors served by our direct crews
Select your local town for specific housing stock details, grant tables, and survey scheduling.
Bray
View Town →Coastal North Wicklow residential retrofits & Victorian/1970s blockwork
Greystones
View Town →Coastal family estates, Charlesland, Delgany & detached wraps
Wicklow Town
View Town →Coastal town housing retrofits & hollow block wraps
Arklow
View Town →South Wicklow residential developments & solid masonry homes
Enniskerry
View Town →Foot of the mountains detached homes & period retrofits
Blessington
View Town →West Wicklow commuter corridor & lakeside residential retrofits
Building a new home or extension in Wicklow? Explore our ICF Wicklow construction services.
Common questions from County Wicklow homeowners
How much does external wall insulation cost in County Wicklow in 2026?+
A job typically starts from €180 to €220. Final figures depend on extras, architectural details, and chosen finishes — such as whether silicone-based acrylic render is required for homes close to the sea to withstand coastal salt air, and whether window cills subject to high water runoff require special powder coating. As an SEAI Registered Contractor (#10423), Isotherm deducts your SEAI grant (up to €8,000 for detached, €6,000 for semi-detached/end-terrace, €3,500 for mid-terrace, and €3,000 for apartments) directly from your invoice at source.
How do your systems handle Wicklow coastal driving rain and mountain dampness?+
County Wicklow experiences intense coastal winds, salt spray along the Irish Sea corridor (Bray to Arklow), and high moisture levels in mountain foothill areas. We specify NSAI-certified Baumit external wall insulation systems with Baumit SilikonTop silicone render. This breathable, hydrophobic topcoat forms an impenetrable barrier against wind-driven rain while preventing algae growth and peeling.
How fast can Isotherm crews reach Wicklow from your depot?+
Our operations base and metal fabrication workshop are located at Unit 20, Westlink Industrial Estate, Kylemore Road, Inchicore, Dublin 10 (D10 TD35). Taking the M50 south onto the N11 corridor, our installation crews reach North Wicklow (Bray, Enniskerry, Greystones) in 25 to 30 minutes, and Wicklow Town or Arklow in 40 to 50 minutes, ensuring daily on-site supervision and prompt project delivery.
Do I need planning permission for external wall insulation in Wicklow?+
For the vast majority of residential homes across County Wicklow, external insulation is classified as Exempted Development under Section 4(1)(h) of the Planning and Development Act 2000, provided the render finish matches the local aesthetic. For period Victorian properties in Bray or Protected Structures within Delgany and Enniskerry heritage zones, consultation with Wicklow County Council is required. We evaluate planning exemption during your free survey.
How are window sills handled on Wicklow external insulation projects?+
Adding 100mm to 150mm of external insulation extends past original concrete window sills. We install custom powder-coated aluminium window sills fabricated by our sister workshop, Cills.ie, located in our Inchicore depot. Each sill features welded watertight upstands, thermal separation tape, and extended drip projections to protect your facade against coastal weathering.
Can I qualify for an SEAI grant if my Wicklow home previously had cavity bead insulation?+
Yes. Under the SEAI 2026 'second wall measure' regulations, homeowners in County Wicklow who previously claimed a cavity bead injection grant can now claim the full €6,000 (semi-d) or €8,000 (detached) external wall insulation grant to reach an A-rated building envelope.
Book your free on-site survey in County Wicklow
Our direct installation crews cover Bray, Greystones, Wicklow Town, Arklow, Delgany, Enniskerry, and all County Wicklow. Up to €8,000 in SEAI grants deducted straight from your invoice.
