Everything UK homeowners need to make genuinely informed decisions about insulation, solar panels, heat pumps, grants and energy efficiency in 2026.
The problem with most insulation information — and how we’re different
Choosing the right insulation in the UK is one of the most important decisions homeowners can make. Yet most of the information available online is produced by manufacturers, sponsored by installers, or written by companies with a direct financial interest in the outcome. The result is a market full of biased advice that steers homeowners towards the wrong products.
The most damaging example is spray foam insulation. Despite being widely promoted by commission-driven sales teams — sometimes cold-calling homeowners and door-knocking — spray foam is one of the worst insulation choices for most UK properties. It scores 4.0/10 on our independent system due to serious mortgage risks, expensive removal costs (£2,500–£10,000), and structural issues it can cause to roof timbers. Yet thousands of UK homeowners have had it installed because they trusted the advice they were given.
Independent scoring system. Every insulation type is rated across 5 factors — cost, energy efficiency, lifespan, risk level, and installation complexity. No manufacturer pays to influence our scores. Suitability depends on your property’s construction and application
The knowledge that protects your money and your property
For any home with accessible loft space, the loft is always the first and most cost-effective upgrade. Payback periods of 1–4 years make it one of the UK’s best-value home improvements. Start here — always. See our complete loft insulation guide.
Suitability depends on your property’s construction and application draughty lofts and installs faster. The right choice depends on your specific loft conditions. See our foil vs fibreglass comparison.
Not all cavities are suitable for insulation. A survey must confirm the cavity is dry, properly built, and free of contamination. Skipping this step can lead to moisture problems. See our full comparison guide.
Multiple major UK lenders decline mortgage applications on homes with spray foam on roof timbers. Removal costs £2,500–£10,000. Never install without independent specialist advice. See our spray foam risks guide.
ECO4, ECO4, Welsh Nest, and Home Energy Scotland Grant and Loan / Warmer Homes Scotland provide funded or subsidised insulation for eligible households. Note: GBIS closed on 31 March 2026.olds. Our installer partners check eligibility free of charge. See our energy bills guide.
Choose a guide to get started, or use our comparison tool for a personalised recommendation
Our guides give you the knowledge. Our comparison tool applies it to your specific home — with savings estimates, payback periods, and a matched local installer quote. Free. 30 seconds.
Check My Home Now →Match your situation to the right starting point
| Your Situation | Main Issue | Start Here | Then Read |
|---|---|---|---|
| No loft insulation yet | High bills, cold home | Loft Insulation UK Guide | Cost Guide |
| Condensation in loft | Damp, mould in roof | Condensation Fix Guide | Loft Guide |
| Was offered spray foam | Unsure about risks | Spray Foam Risks Guide ⚠ | Best Insulation Guide |
| Comparing foil vs fibreglass | Choosing loft type | Foil vs Fibreglass | Cost Guide |
| Want to reduce bills | High energy costs | Reduce Bills Guide | Full Comparison |
| Checking if insulation is worth it | ROI uncertainty | Is It Worth It Guide | Cost Guide |
| Old insulation — replace or top up? | Existing insulation concern | Lifespan Guide | Loft Guide |
Situation: Homeowner was about to accept a spray foam quote from a door-to-door salesman. Before signing, they read our spray foam risks guide. They cancelled.
What they did instead: Used our comparison tool, got matched to a vetted installer, had a free survey. Foil insulation installed in loft + cavity wall insulation. Total cost: £1,100.
Bills reduced by £400/yr. Mortgage unaffected. Payback under 3 years.
Situation: Homeowner had condensation in loft and assumed they needed expensive roof repairs. Read our condensation guide and discovered the real cause was blocked eaves, not a roof leak.
What they did: Installer added ventilation baffles + foil insulation. Total cost: £640. No roof work needed.
Condensation resolved. Bills down £190/yr. Saved £3,000+ on unnecessary roof repairs.
Free comparison. Personalised recommendation. One vetted local installer. No pressure.
Check My Home Now →