Millions of households in the UK, particularly in London, face high energy bills due to uninsulated external walls. External wall insulation (EWI) is one of the most effective solutions to reduce heat loss, lower energy costs, improve comfort, and enhance your home’s appearance.
But one question many homeowners ask is: “Is external wall insulation safe?”
At Infinity, we specialise in professional EWI services across London. We understand that safety, compliance, and long-term performance are essential. Here’s what every homeowner should know before upgrading their home.
What Is External Wall Insulation?
External wall insulation involves applying a layer of insulation to the outside of your property, followed by a protective render or cladding. It’s particularly effective for older homes with solid walls that cannot benefit from cavity insulation.
At Infinity, we use EPS (Expanded Polystyrene) and XPS (Extruded Polystyrene) boards – lightweight, breathable, moisture-resistant, and highly energy-efficient.
A standard EWI system from Infinity includes:
- Insulation boards (EPS/XPS) – retain heat and improve thermal efficiency
- Reinforced base coat with mesh – strengthens the insulation and prevents cracks
- Weather-resistant render or decorative cladding – protects against the elements and enhances your home’s exterior
The result? A warmer, more energy-efficient home with a modern, stylish finish.
Why Installation Quality Determines Safety
The safety and performance of EWI rely on expert installation and certified materials. When installed correctly, EWI is completely safe, compliant with UK Building Regulations, and built to last.
Infinity follows a strict process to ensure your home is protected from damp, moisture, fire, and structural issues.
1. Moisture and Damp Protection
A common misconception is that insulation can trap moisture and cause dampness. The truth is that damp problems only arise when installation is done incorrectly.
At Infinity, we start every project with a comprehensive property survey, assessing wall type, ventilation, and moisture condition. Our EPS/XPS insulation boards and render systems are vapour-permeable yet water-resistant, allowing walls to breathe while keeping external rainwater out.
Every joint, window reveal, and edge is meticulously sealed. Properly installed EWI helps prevent damp and condensation, ensuring your walls remain dry and healthy.
2. Structural Strength and Weather Resistance
Infinity’s systems are engineered for long-term stability. Using mechanical fixings and reinforced base coats, our insulation remains secure even in harsh UK weather.
Our installations are designed to resist wind loads, rain, frost, and UV exposure. The topcoat render provides a durable shield, protecting your home while maintaining energy efficiency.
3. Breathability and Indoor Air Quality
Properly installed EWI maintains natural airflow and moisture balance, preventing condensation and mould growth. Your home stays comfortable, healthy, and energy-efficient throughout the year.
4. Compliance and Certification
Infinity installations comply with UK Building Regulations and are PAS 2035 compliant. All systems come from certified manufacturers, and our team consists of TrustMark-approved installers with decades of experience.
We also provide:
- 25-year insurance-backed guarantee
- 2-year workmanship warranty
- Full support and aftercare guidance
5. Environmental Benefits
EWI is also environmentally safe. By reducing heat loss, your home consumes less energy, lowering your carbon footprint and supporting the UK’s net-zero targets.
Our EPS/XPS boards are recyclable, and the materials we use are produced sustainably – making your insulation upgrade eco-friendly.
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6. Professional Installation Matters
EWI is a specialist process. Poor installation can lead to cracking, moisture retention, or reduced thermal performance.
Infinity follows a strict workflow for every project:
- Initial consultation – Understand your needs and answer questions
- Customised plan – Tailored to your property’s size and structure
- Expert installation – Certified team ensures high-quality workmanship
- Ongoing support – Guidance on maintaining insulation efficiency
7. Long-Term Durability and Maintenance
Infinity’s EWI systems last 25+ years with minimal maintenance. The topcoat render prevents cracking and fading, requiring only occasional cleaning.
We provide full aftercare advice to keep your insulation performing optimally.
External Wall Insulation Grants in London
Several government schemes can help reduce the upfront cost of EWI, including:
- Energy Company Obligation (ECO)
- ECO4 Grant
- Great British Insulation Scheme (GBIS)
- Warm Homes Grants
Infinity helps homeowners check eligibility and apply for grants, making energy-efficient upgrades affordable and hassle-free.
Eligibility is generally based on:
- Energy Performance Certificate (EPC) rating – D, E, F, or G
- Council Tax band – lower bands (A-D) often qualify
- Low-income benefits – JSA, ESA, Universal Credit, Pension Credit, Child Tax Credit, and more
The Final Verdict: Safe, Reliable, and Worth It
So, is external wall insulation safe?
Absolutely – when installed by Infinity in London.
Our systems are weather-resistant, certified, and installed by experienced, TrustMark-approved professionals. You gain long-term energy savings, improved comfort, and reduced carbon footprint with full peace of mind.
Upgrade Your Home with Confidence
Infinity provides:
- Free home survey & quote
- Certified EPS/XPS insulation systems
- Grant application support
- 25-year insurance-backed guarantee
Book your free home assessment today and see how safe, efficient, and sustainable external wall insulation can transform your London home.