⚡ Takes 30 seconds — no phone calls required
A significant amount of heat — often around a quarter — can escape through the roof if your insulation isn’t up to modern standards. But heat loss doesn’t stop there — it can escape through walls, floors, and other areas of your home.
"Saved £250/year on my energy bills. The comparison tool made it so easy — I knew exactly what to get before the installer even turned up."
"No pushy sales calls — just one installer who came out and did a proper job. The scoring system told me to avoid spray foam and I'm glad it did."
"Used the postcode tool, answered 4 questions, got a recommendation in under a minute. Foil insulation was spot on — house is noticeably warmer."
Heat naturally rises, so without effective insulation in place, it escapes through your roof — increasing energy bills and reducing comfort in your home. That’s why choosing the right insulation solution is so important.
A significant amount of heat — often around a quarter — can escape through the roof if your insulation isn’t up to modern standards. Your heating system then has to work harder to maintain temperature, which means higher energy bills and a colder home.
Your heating system works harder to maintain temperature, costing you more every month.
Rooms feel colder than they should, no matter how much you turn up the heating.
The good news: the right insulation can significantly reduce heat loss and lower your bills.
That’s why choosing the right insulation solution for your roof is so important. Modern solutions such as reflective foil insulation are designed to help reduce heat loss and improve overall energy efficiency.
Let’s check your home ↓If your home is losing heat, your heating system needs to run longer and work harder to maintain temperature.
Your boiler runs longer trying to replace heat that's constantly escaping through the roof and walls.
Some rooms stay cold no matter how high the heating is turned up — a classic sign of poor insulation.
Energy used to heat a poorly insulated home is largely wasted — money spent heating the outside.
If insulation is missing, outdated, or not performing properly, heat will continue to escape. That’s why choosing the right solution for your home is essential.
Modern insulation solutions are designed to improve energy efficiency and help reduce heat loss across multiple areas of the property — not just the roof.
The right approach considers your property type, existing insulation, and the areas where heat is most likely escaping.
Compare your options →Reflective foil insulation is designed to help reduce radiant heat loss and support existing insulation. It can improve overall efficiency by helping your home retain heat more effectively.
When used correctly, it can form part of a broader approach to improving energy performance — particularly in loft and roof spaces where heat loss is most significant.
No jargon, no pushy sales. Just clear, honest information and connections to local experts who can help.
We identify your region instantly and match you to local installers who cover your exact area — no searching required.
Our scoring system rates each type on cost, energy efficiency, lifespan, risk, and installation complexity — honestly.
We route your details to a verified local specialist. Receive relevant quotes from trusted installers — no cold calls.
We score every option across five weighted factors. No manufacturer pays to appear higher — scores are calculated independently so you can trust them completely.
We built InsulationComparisons.co.uk because the insulation market was confusing and full of pushy salespeople. We wanted to change that — and we have.
Our scores are calculated independently. No manufacturer or installer pays to rank higher.
We're not owned by or affiliated with any insulation company or national installer network.
Our vetted installer network covers every major region across England, Wales, and Scotland.
Your details are only ever passed to one relevant local installer — never sold to call centres.
Our network covers every major UK region. Enter your postcode and we'll connect you with an installer who knows your area.
Scores are calculated using real data. No manufacturer or installer pays to rank higher on our platform.
The most cost-effective route to reducing heat loss. Suitable for most UK homes with accessible loft space.
Injected between inner and outer walls. Effective but requires a professional survey before installation.
Applied to the outside of solid walls. Higher upfront cost but excellent long-term thermal performance.
Reflective barrier technology. Outstanding performance in lofts and underfloor applications.
High performance but carries significant mortgage and resale risks. Read our full warning before proceeding.
Installed beneath floorboards. Reduces draughts and cold floors significantly with minimal disruption.
Insulation boards on the inside of solid walls. No planning permission required — ideal for flats and terraces.
Specialist insulation for flat and low-pitch roofs. Often combined alongside waterproofing works.
Your complete, independent guide to home insulation types, costs, and energy savings in the UK.
Choosing the right home insulation in the UK can be overwhelming. With dozens of insulation types, varying costs, and no clear independent guide, most homeowners end up either overpaying or choosing the wrong product entirely. Insulation comparison allows you to assess each option — loft insulation, cavity wall insulation, external wall insulation, spray foam, foil insulation, and underfloor insulation — side by side, scored against what matters most: cost, energy efficiency, lifespan, installation risk, and complexity.
The best insulation for your UK home depends on your property type, wall construction, and budget. For most homes with an accessible loft, loft insulation (fibreglass or mineral wool) offers the highest return on investment — typically paying for itself within 2–3 years. For solid-walled older properties, foil insulation and external wall insulation are strong performers. Our scoring engine rates foil insulation at 8.5/10 for its low risk, high efficiency, and versatility across different property types.
Two of the most common insulation types in the UK are loft insulation and cavity wall insulation. Loft insulation is typically the first upgrade recommended for UK homeowners — it costs between £200–£400 for a standard semi-detached home and can save up to £150 per year on energy bills. Cavity wall insulation is injected into the gap between the inner and outer wall of cavity-built homes (most UK homes built after 1920). It can save up to £250 per year but requires a professional survey to check cavity suitability before installation. For homes with solid walls, cavity wall insulation is not possible — external wall insulation or internal wall insulation are the recommended alternatives.
Insulation costs vary significantly by type and property size. As a general guide for UK homeowners in 2024–2025: loft insulation (fibreglass, 270mm depth) typically costs £300–£500 for a semi-detached; cavity wall insulation ranges from £400–£800 depending on property size; external wall insulation is significantly more expensive at £6,000–£15,000 for a full property but offers excellent long-term savings; spray foam insulation costs £1,000–£2,500 but carries significant risks including potential mortgage refusal — we always recommend seeking independent advice before proceeding. Foil insulation for lofts costs £200–£600 and is one of the most cost-effective options per performance point on our scoring system.
The UK has some of the oldest housing stock in Europe, making proper insulation one of the most effective ways to reduce energy bills. According to the Energy Saving Trust, a poorly insulated home can lose up to 33% of heat through the roof, 35% through walls, and 15% through floors. The most impactful upgrades to reduce energy bills are: (1) loft insulation — lowest cost, fastest payback; (2) cavity wall insulation — significant annual savings if property is suitable; (3) external or internal wall insulation for solid-wall homes. Combining loft and wall insulation can reduce a typical UK household's heating bills by £400–£650 per year.
Spray foam insulation is one of the most misunderstood products in the UK market. While it offers strong thermal performance, spray foam applied to roof timbers has been flagged by major UK mortgage lenders as a significant risk — causing homes to fail mortgage valuations and making properties harder to sell. The Royal Institution of Chartered Surveyors (RICS) has issued guidance advising homeowners to seek independent advice before installation. Our platform scores spray foam at just 4.0/10 because of these risks, and we always include a clear warning on every spray foam comparison. If you've already had spray foam installed, specialist removal services are available — contact us for independent advice.
Both foil and fibreglass insulation are popular for UK lofts, but they perform differently. Fibreglass (mineral wool) insulation is the most widely installed loft insulation in the UK. It's affordable, effective, and has a long lifespan (25+ years). However, it works by trapping air within its fibres and requires good ventilation to perform correctly. Foil insulation uses a reflective barrier system to reflect radiant heat back into the property. It installs faster, is less intrusive, and performs excellently in cold, draughty loft spaces. Our scoring system rates foil insulation at 8.5/10 compared to fibreglass at 7.5/10, primarily due to foil's lower installation risk, faster ROI, and versatility across property types. However, the best option for your specific home depends on your loft type, existing insulation, and budget — which is why we recommend using our free comparison tool to get a personalised recommendation.
Use our free comparison tool to get a personalised recommendation in 30 seconds — no phone calls, no obligation.