Cavity Wall Insulation Hampshire
Cavity Wall Insulation Services in Hampshire
At Loft Insulation Specialists, we help Hampshire homeowners cut heating bills, stay warmer all year, and improve their property’s energy performance. Did you know up to 35% of your home’s heat escapes through uninsulated walls each winter? Our cavity wall insulation keeps that warmth inside – saving you on average £150–£295 annually, and typically paying for itself within three to five years.
Our team covers everything you need to know: suitability, costs, grants, and the installation process. We can also check whether your walls are already insulated and help you raise your EPC rating.
Is Your Home Suitable for Cavity Wall Insulation?
At Loft Insulation Specialists, we exclusively install Superbead EPS cavity wall insulation — the most advanced and proven system for energy efficiency, durability, and moisture control. Before installation, we carry out a detailed property assessment to confirm that your home’s wall structure, age, and exposure make it suitable for Superbead.
Our goal is simple: to help Hampshire homeowners achieve maximum warmth and long-term savings without risk of damp or performance failure.
Explore the five key factors we assess before recommending installation:
Property Age and Construction Type
Most Hampshire homes built between 1920 and the late 1980s use cavity brick construction, which makes them ideal for Superbead insulation. These walls consist of two layers of brick separated by a narrow air gap, typically 50mm or more.
If your property falls into this range, there’s a strong chance it’s suitable for cavity insulation. Homes built after the 1990s may already have insulation, but we can easily confirm this during our free survey.
Wall Cavity Inspection
To determine suitability, we use a borescope camera — a small device that lets us inspect inside your wall’s cavity without disruption. This inspection helps us identify:
1. The cavity width and whether it’s clear of debris
2. Any existing insulation materials
3. Wall tie condition and cavity cleanlinessOnce we’ve confirmed your cavity is open and dry, we’ll measure exactly how much Superbead EPS insulation your property needs for full coverage and maximum efficiency.
Exposure to Wind and Rain
Exposure to wind-driven rain is one of the most important factors we assess. While most properties across Hampshire perform brilliantly with Superbead, we pay special attention to coastal areas like Portsmouth, Gosport, and the Solent region.
Superbead’s unique bonded bead system is moisture-resistant and breathable, making it ideal even for homes facing unpredictable coastal weather. Unlike older foam or fibrous materials, EPS beads won’t soak up water or settle over time.
Compatibility with Superbead EPS Technology
Superbead insulation uses millions of tiny expanded polystyrene beads injected under pressure to completely fill your wall cavity.
Once installed, the beads lock together with a water-repellent additive, creating a seamless and stable thermal barrier.It’s perfect for:
1. Brick or block-built cavity walls
2. Cavity widths over 50mm
3. Homes free from large cracks, open wall vents, or significant damp issuesIf we discover any small defects (like cracked mortar or ventilation gaps), we’ll recommend simple repairs before installation — ensuring long-term efficiency and protection.
Local Property Suitability Across Hampshire
We’ve installed Superbead insulation in thousands of Hampshire homes — from 1930s semis in Southampton to 1980s detached houses in the New Forest. The region’s typical cavity wall construction pairs perfectly with our system.
Each project begins with a free, no-obligation survey where we confirm all eligibility factors. If your walls meet the Superbead criteria, we’ll provide an exact quotation and projected energy savings specific to your property.
Does cavity wall insulation cause damp?
When properly installed and surveyed, cavity wall insulation does not cause damp. In fact, 96% of installations across the UK report zero moisture problems. Issues only arise when assessments are skipped or pre-existing issues—like cracked render or failed wall ties—aren’t addressed.
Before every job, we carry out a full survey. That includes checking for existing damp, testing for moisture, assessing wall tie condition, and understanding local exposure risks. A property in Southsea facing sea winds needs a different approach than a sheltered home in the New Forest—and we tailor our service accordingly. If we ever believe your property isn’t suitable, we’ll tell you upfront.
How much does cavity wall insulation cost, and are grants available?
Our cavity wall insulation typically costs between £1250-£3500, depending on property size and access. Because we’re a local company, our prices often beat national chains while maintaining top-level quality.
Since 2013, millions of UK homes have received free insulation through government schemes. You might qualify for full funding through ECO4 or the Great British Insulation Scheme if you receive benefits such as Universal Credit or Pension Credit, or if your home falls within council tax bands A–D.
What Happens During Installation?
At Loft Insulation Specialists, we make the entire cavity wall insulation process smooth, clean, and quick — typically finished within 2–4 hours for most Hampshire properties. All work takes place outside your home, and our experienced team ensures minimal disruption from start to finish.
Here’s what to expect on installation day:
- 1
Property Preparation and Survey Checks
Wall preparation: We mark precise drilling points along mortar joints to ensure even bead distribution.
Access and safety: We position our equipment to keep pathways and driveways clear, protecting your property and surroundings.
Final cavity checks: Using cameras and airflow testing, we re-confirm that the cavities are dry, debris-free, and ready for insulation.
- 2
Superbead Injection and Filling Process
Precision injection: Our technicians fill each section systematically, ensuring every cavity is completely packed with bonded beads.
Thermal efficiency: As the beads settle, they form a solid yet breathable barrier that prevents heat from escaping.
On-the-go monitoring: We constantly monitor injection pressure and fill levels to avoid voids, cold spots, or overfilling — achieving optimal results in one visit.
- 3
Sealing and Finishing Touches
Seamless repairs: Each drill hole is sealed with colour-matched mortar to blend with your existing brickwork.
Clean site policy: We tidy up all equipment and debris, leaving your property spotless and ready for immediate use.
Final inspection: Before we leave, we perform a quality check, walk you through the completed work, and explain your 10-year IAA-backed guarantee for complete peace of mind.
How much could you save?
According to the Energy Saving Trust, our cavity wall insulation can reduce your heating bills by £150–£295 each year – and even more for larger detached homes. With energy prices as they are, that means the work pays for itself in just a few years.
Many customers tell us they’ve been able to turn their thermostat down a couple of degrees while keeping the same comfortable warmth. Over 25 years, savings can easily reach £4,000–£7,000.
Why Choose Loft Insulation Specialists for Cavity Wall Insulation in Hampshire?
Award-Winning Insulation Services
We have been recognised as the 'Best Insulation Installation Firm Hampshire - 2023' by the Southern Enterprise Awards, an independent awarding body.
Guaranteed energy savings
We guarantee up to 35% lower energy bills by slashing heat loss, backed by our free survey, transparent results and full satisfaction pledge - if your home isn't noticeably warmer, we fix it free.
Proven Accredited Reliability
Checkatrade and Google reviews from Hampshire locals verify our punctuality, spotless sites and top-quality services - independent proof we deliver every time.
True Local Hampshire Experts
Fast same-week surveys and quotes, as well as tailored solutions for local projects mean quicker installs and better results than out-of-area firms.
40+ years of experience
With over 40 years of experience in insulation and home improvements, our team quickly diagnoses issues, gives better advice, and delivers installations done right the first time.
No-obligation surveys
Our surveys are always free with zero obligation. No high-pressure sales or jargon: just straightforward facts and options, respecting your decision every time.
Frequently asked questions
Take a look at the Frequently Asked Questions regarding our Cavity Wall Insulation service.
What if something goes wrong later?
All our cavity wall insulation work includes a 10-year IAA (Insulation Assurance Authority) backed guarantee covering materials and workmanship. That means you’re protected even if we’re no longer trading in the future (though we’re here for the long run).
On rare occasions—less than 4% across the industry—insulation may need attention. If that ever happens, we’ll handle any necessary inspections or replacements promptly and transparently.
Unsure if your home is already insulated?
We can confirm within minutes using a borescope inspection. You might also spot filled drill holes along your external walls, a common sign of previous insulation. We can check records with IAA (Insulation Assurance Authority) and your local council to find out whether your property was insulated under past government schemes.
Can cavity wall insulation raise your EPC rating and home value?
Yes – it can often improve your EPC rating by 1–2 bands, helping your property move from a D or E rating up to a B or C. An improved EPC not only lowers your running costs but can increase your home’s value by an average of 1–2%.
For landlords, this also helps meet Minimum Energy Efficiency Standards (MEES) for rental properties.
Is any maintenance required?
None at all. Once installed, your insulation will perform for the lifetime of your building. Simply keep your external walls in good condition and maintain ventilation indoors. We’re always here for periodic checks or advice about ongoing home efficiency improvements.
What about older or listed homes?
If your home was built before 1920 or is listed, we’ll start with a careful assessment. Some early cavity wall properties can take insulation safely, while Victorian or Edwardian homes with solid walls may need a different approach.