External Wall Insulation
in London & Surrey
At HICL, we specialise in external wall insulation (EWI) that not only improves your home’s energy efficiency but also transforms its appearance. Whether you're looking to reduce heat loss, prevent damp issues, or give your home a smart, weather-resistant finish, our tailored EWI solutions combine thermal performance with elegant design. Serving homeowners across South-West London, Surrey and surrounding areas, we deliver fully managed, high-spec retrofit services.
External Wall Insulation in Surrey & Greater London
External wall insulation provides an excellent opportunity for homeowners to improve energy efficiency, reduce heat loss, and upgrade the visual appearance of their property. It offers all these benefits without causing disruption inside the home. Whether you want to lower your energy bills, eliminate cold spots, or modernise a dated exterior, external wall insulation delivers both comfort and enhanced kerb appeal.
In today’s energy-conscious climate, more homeowners are turning to retrofit solutions such as external wall insulation to meet evolving efficiency standards, manage rising utility costs, and create healthier indoor environments. This form of insulation helps maintain a stable indoor temperature throughout the year. It prevents heat from escaping during the colder months and limits overheating during warmer periods. Additionally, it can significantly reduce the risk of damp, condensation, and external noise, particularly in older properties with solid walls.
At Home Improvements & Construction Ltd, we provide tailored external wall insulation services for properties throughout Surbiton and Greater London. From the initial site assessment and product recommendations through to professional installation, rendering, and finishing, we manage every step with care and expertise. Whether you are improving your family home or preparing a rental property to meet higher EPC requirements, our team will deliver a solution that enhances both the performance and appearance of your home.
Why Choose External Wall Insulation?
External wall insulation offers one of the most effective ways to boost your home's thermal performance.
By applying insulation boards and render systems to the outside of your property, you create a protective shell that:
- Retains warmth during winter
- Keeps interiors cooler in summer
- Reduces energy bills
- Improves EPC ratings
- Prevents condensation and damp
- Enhances your home's kerb appeal
Whether you're retrofitting an older property or future-proofing a recent purchase, EWI is a smart, sustainable investment.
Our EWI Process
With over 15 years of building and retrofit experience, HICL manages every stage of the process, from technical planning to final finishes. Here's how we work:
- Initial Site Survey
We assess your property's suitability and identify the right insulation system. - Specification & Design
We help you choose the perfect render style and finish to complement your home. - Installation
Our expert team installs high-performance insulation boards and weatherproof render with precision and care. - Aftercare & Certification
We offer warranties, guidance on maintenance, and assist with any grant paperwork or compliance.
Is Your Property Suitable?
Most solid wall homes and older brick properties (built before 1920) are ideal candidates for external wall insulation. It’s also highly effective for detached, semi-detached, or end-of-terrace houses with exposed brick or rendered finishes.
We’ll advise you on planning permissions (where applicable), insulation depth, and finish options. Our team ensures every project complies with
PAS 2035 retrofit standards and aligns with London borough guidelines.
Finish Options & Style
EWI doesn’t mean compromising on aesthetics. Choose from a wide range of finishes, including:
- Silicone or acrylic render (available in dozens of colours)
- Brick slips for a traditional brick look
- Timber-effect panels for contemporary homes
- Smooth or textured finishes for modern facades
Whether you're blending in with period architecture or going for a crisp, minimalist finish,
we’ll help you design the ideal look.
Grants & Funding
HICL can help you explore available external wall insulation grants in London, including schemes under the Great British Insulation Scheme (GBIS) and other local funding initiatives.
We stay up to date on the latest government support and can guide you through the application process, ensuring you're making the most of any available financial help.
External Wall Insulation FAQs
Do I need planning permission for external wall insulation?
- In most cases, no – but if your home is listed, in a conservation area, or the installation changes the external appearance significantly, permission may be required. We’ll guide you through this.
Will EWI reduce my heating bills?
- Yes. Homeowners can expect savings of up to 35% on heating costs, depending on property type and existing insulation.
How long does the process take?
- Most installations take
2–3 weeks, depending on the size and complexity of your home.
Can I install EWI on a terrace or flat?
- Yes, though we’ll carry out a detailed feasibility check. Party walls and access may affect design and installation.
Recent EWI Projects in London
Twickenham, SW London – Detached 1930s Home
- Full wraparound EWI with silicone render in ivory finish. EPC rating improved from D to B.
Chessington – Semi-Detached Property
- External insulation and brick-slip finish for seamless blend with neighbouring houses.
Richmond – Victorian Terrace
- Rear wall insulated and rendered as part of a loft conversion and full home refurb.
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Why Choose HICL?
- We manage your external wall insulation project from start to finish, with no need to involve separate contractors or outsourced trades.
- Whether you already have specifications in mind or require expert guidance, our team can design and deliver a tailored insulation system to suit your property.
- We handle all relevant submissions to building control and provide full documentation, ensuring a smooth and compliant installation process.
- Benefit from our trusted supplier network and trade pricing, giving you access to premium materials at competitive rates.
- From the first consultation to the final render finish, you will receive clear communication and dedicated service throughout the project.
- We provide a personalised schedule of works so you can easily track progress and understand what to expect at each stage.
- Your satisfaction is our highest priority, and we take care to ensure the finished result meets both your energy performance goals and your aesthetic expectations.
