We turn cold, drafty houses into warm, cozy homes
Direct External Wall Insulation & ICF installation services across Ireland. Access SEAI grants up to €8,000 and build or retrofit your high-performance home.
Join 1,700+ homeowners across Ireland who found trusted insulation installers with ISOTHERM
Free service • No obligation • Verified installers
✔ Verified NSAI Contractor • Free Survey Scheduled
What is Isotherm?
We are Ireland's authority on home insulation and ICF construction, operating as a direct contractor to deliver warm, cozy, and energy-efficient homes.
Certified ICF & EWI Installation
Isotherm directly delivers certified, high-performance external wall insulation and insulated concrete formwork builds with our own dedicated crews.
Fully Insured & Registered
We are a fully registered SEAI contractor and NSAI-certified partner, ensuring your energy upgrades qualify for government grants of up to €8,000.
Complete Project Management
We manage your build from design to finish, including engineering layouts, app-based cill measurements with Cills.ie, and final rendering.
Tailored retrofitting solutions built for Ireland
Whether you are a homeowner seeking to lower heating bills or a certified contractor looking to list your business, we connect you with vetted reliability.
For Homeowners
Maximize SEAI Grants (Up to €8,000)
Improve your BER rating, lower energy bills, and cut heat loss. Learn about government grants for attic, cavity wall, floor, and external wall insulation.
Check Grant EligibilityOur Certified Installation Teams
Ensure your home is built or retrofitted to the highest standards. Our direct regional crews deliver airtightness, structural strength, and peak thermal efficiency.
View Installation DivisionsInsulation & Retrofit Tech Guides
Building new or doing a deep energy retrofit? Discover modern Insulation standards, Cavity upgrades, Attic solutions, and ICF building systems.
Compare Insulation TypesFor Retrofit Installers
Join Our Subcontractor Network
Certified, fully-insured ICF or EWI crews can partner with Isotherm for regional projects. We manage client acquisition, billing, and scheduling.
Register Your Crew InterestHighlight Your Quality Vetting
We hold our installation partners to the highest standards of safety, quality, and certification, guaranteeing NSAI and SEAI compliance on every site.
Contact Contractor DeskMobile Crew Application
Are you an installer on site? Access assigned jobs, log cill dimensions, and check technical specifications (Amvic 280mm details) in real-time.
Open Crew PortalHow Isotherm Works
Finding the right installer is as easy as 1, 2, 3.
Search
Use our directory to find installers by location and speciality.
Compare
Review profiles, project galleries, and homeowner reviews.
Connect
Contact installers directly for a no-obligation quote.
Compare Insulation Types
Expertly structured comparison guides to find the best thermal efficiency upgrades for your building.
External Insulation
Learn More
Attic Insulation
Learn More
Internal Insulation
Learn More
Floor Insulation
Learn MoreCheck Your SEAI Grant Eligibility
The Irish government offers generous grants of up to €8,000 to make your home warmer and more energy-efficient. Let us guide you through the process.
Check Grant EligibilityDon't Ruin Your Renovation: NSAI Quality Standards
Substandard retrofitting damages properties and poses serious safety risks. Learn how to protect your home and ensure your insulation project meets official standards.
Ventilation & Airflow Safety
Substandard insulation work can block attic soffits and fascia vents. Restricting airflow causes condensation, mold, and risks hazardous carbon monoxide buildup.
Utility & Gas Box Relocation
Gas meter boxes must be moved to the exterior of the finished external insulation surface. Trapping utility boxes behind insulation risks gas leaks building up behind EWI boards.
NSAI Certified Products
There is no legal requirement in Ireland for insulation installers to be NSAI certified. Homeowners must independently verify contractor certification.
NSAI Recommended 6-Step Homeowner Checklist
Check that the contractor is an NSAI registered installer.
Verify all products (Cavity Wall / External systems) are NSAI certified.
Confirm the contractor has active, comprehensive liability insurance.
Verify active SEAI registration to guarantee grant eligibility.
Ask for client references and visit completed insulation projects.
Read the warranty small print — installation must match manufacturer guidelines.
Why Homeowners Trust Isotherm
Verified Installers
Every installer is vetted for insurance, certification, and quality of work.
Grant Support
We guide you through the SEAI grant application process to maximize your savings.
Compare Options Easily
Browse installer profiles, project galleries, and insulation systems all in one place.
100% Free Service
Our platform is completely free for homeowners. No fees, no commission.
Only Trusted and Verified Installers
Every professional in our network is fully accredited, insured, and verified to execute high-quality retrofits.
What Irish Homeowners Say
Hear from home energy upgrade participants who successfully retrofitted their properties.
"Isotherm helped me find the right installer and saved me thousands. My home has never been warmer!"
"The whole process was so simple. I compared three quotes and picked an amazing local company. Highly recommended."
"We were clueless about SEAI grants. Isotherm made it easy to understand and now our heating bills are a fraction of what they were."
Find Trusted Insulation Installers Near You
Free service. No obligation.