Isotherm is an SEAI registered external wall insulation contractor based in Westlink Industrial Estate, Dublin 10. We supply and install certified EWI systems across Dublin, Kildare, Meath, Wicklow, and Louth. Homeowners can secure SEAI grant support of up to €8,000 for detached homes or €6,000 for semi-detached properties, with all grant administration managed directly on your behalf by our specialist team.
Most of Your Heat Is Leaving Through the Walls. See What It Costs to Stop It.
Isotherm installs certified external wall insulation in Dublin and surrounding counties. Get your figure in three steps, with the SEAI grant applied.
Serving Dublin, Kildare, Meath, Wicklow, & Louth
Rated 5.0 Stars based on 48 Google Reviews
*Grant amounts are subject to SEAI eligibility, property built and occupied before 2011, and prior approval.
Step 1 of 3
1. Property Profile
Select your building details to start your out-of-pocket calculation.
*Note: Properties must be built and occupied before 2011 to qualify for the SEAI grant.
Completed Project Showcase
Real external wall insulation projects completed directly by Isotherm crews across Ireland.
Sto Render Finish - County Dublin
External insulation cladding with direct Sto render coating and integrated in-house CILLS Limited aluminium sills.
Baumit EWI System - County Wicklow
Full external wrapping utilizing NSAI-certified Baumit system with extended reveals and sills.
Up to 45% Energy Savings
Lower heat loss through external walls by up to 45%, reducing your winter heating bills and draft problems.
Aesthetic Home Upgrade
Modernize your house exterior with high-durability Sto or Baumit silicone color renders that stay clean longer.
Eradicate Condensation & Mould
Raising wall surface temperatures stops water vapour from condensing, eliminating mould spores permanently.
What is Included in Our Pricing?
Isotherm provides a complete turn-key service with transparent pricing covering every stage of EWI installation.
- Scaffolding setup, safety compliance, and scaffold removal
- Substrate preparation, wall cleaning, and making good defects
- NSAI-certified high-density EPS thermal insulation boards
- Flexible base coat rendering with fibreglass mesh embedding
- Custom window reveal extensions and thermal insulation surrounds
- Sto or Baumit silicone decorative topcoat color render
- Custom-fabricated window sills and parapets by CILLS Limited
- Cleaning, site restoration, and disposal of project waste
NSAI-Certified Render Systems & Detailing
We use certified systems and materials from Sto and Baumit. All aluminium flashings are fabricated in-house to secure reveals against water ingress.
Sto Systems
Premium German render systems certified by the NSAI for lifetime structural durability.
Baumit Systems
Breathable, water-resistant renders engineered specifically for damp maritime climates.
CILLS Limited Detailing
In-house metal fabrication ensures seamless window reveals and eliminates reveal leakage risk.
How the SEAI Grant Works
The SEAI grant application is managed on your behalf by our compliance team. Below is the standard timeline.
Survey & Quote
We perform a detailed site survey and generate your out-of-pocket cost quote.
Prior Approval
Our team submits the grant application. Approved funding is locked before works begin.
Certified Install
Isotherm crews complete the insulation wrapping and render system.
Post-Works BER
We coordinate the post-project BER assessment and claim the grant.
Cost and Grant Breakdown
Compare indicative EWI system costs, available grants, and final out-of-pocket balance estimates.
| Property Type | Est. Total Cost | SEAI Grant | Out-of-Pocket Balance |
|---|---|---|---|
| Apartment | €9,000 - €12,000 | €3,000* | €6,000 - €9,000 |
| Mid-Terrace House | €11,000 - €15,000 | €3,000* | €8,000 - €12,000 |
| Semi-Detached / End-Terrace | €13,000 - €19,000 | €6,000* | €7,000 - €13,000 |
| Detached House | €18,000 - €25,000 | €8,000* | €10,000 - €17,000 |
*Grant amounts are subject to SEAI eligibility, property built and occupied before 2011, and prior approval. Total cost ranges are estimates subject to physical site survey.
Homeowner Reviews
Read verified feedback from homeowners who had EWI systems installed by Isotherm.
"The out-of-pocket quote was accurate. Isotherm completed the external wall insulation within three weeks. Sto rendering is flawless and the house is notably warmer."
"Highly recommend Isotherm. The EWI team coordinated the SEAI grant paperwork on my behalf. The custom window sills from Cills Limited fit perfectly."
"Professional service from start to finish. The insulation boards were fixed securely and render looks great. Reduced my gas bills significantly."
Frequently Asked Questions
Find clear answers to common questions about EWI costs, specifications, and SEAI grants.
Our Service Area
Isotherm provides direct EWI installation services in the following counties in Ireland:
Ready to Upgrade Your Home?
Calculate your estimated EWI costs and available SEAI grants using our interactive wizard today.