Your Loft Insulation Questions – Answered

How much money can I save with loft insulation?

You can save £150–£500+ per year on energy bills, depending on your property type and current insulation levels. Detached houses see the biggest savings, and even smaller homes benefit significantly over time. Loft insulation a quick and effective improvement you can make to your home at no cost with a Government grant.

How thick should loft insulation be?

For maximum efficiency, loft insulation should be around 270mm thick (about 10.5 inches) in the UK. This meets modern building standards. If you have older insulation (often 100mm or less), topping it up can significantly boost performance.

Does loft insulation help in the summer too?

Yes! Loft insulation reduces heat gain during hot months, keeping upstairs rooms cooler and more comfortable. It stabilizes indoor temperatures year-round and reduces reliance on heating and air conditioning.

Can I still use my loft for storage after insulating it?

Yes, but you need to do it carefully:

• Never compress insulation with boxes—it reduces effectiveness.

• Use raised loft boarding systems above the insulation (e.g., Loft Legs or stilts).

• You may need to lay chipboard or plywood over the raised supports.

How long does loft insulation last?

Most loft insulation materials last at least 40 years and often much longer if undisturbed. It’s a “fit and forget” upgrade. However, you should check occasionally for signs of damp, pest damage, or compaction.

Are there government grants or schemes for loft insulation?

Yes, in the UK:

• The ECO4 scheme offers free or discounted insulation for low-income households.

• Local Authority Flexibility Scheme  grants may also be available.

• Great British Insulation Scheme an insulation focused scheme with minimal eligibility criteria

What are the signs that I need to replace or upgrade my loft insulation?

• Rooms feel cold or draughty, especially upstairs.

• High energy bills despite using heating wisely.

• Damp or mould in the loft or on upstairs ceilings.

• Thin, patchy, or compressed insulation when you inspect it.

• Your insulation is under 150mm thick—a top-up is likely worth it.

What are the key benefits of loft insulation?

Loft insulation offers a range of powerful benefits:

• Saves money on energy bills—up to £150 to £500 + per year, depending on your home.

• Improves comfort by maintaining a consistent indoor temperature.

• Reduces your carbon footprint by cutting down on wasted energy.

• Increases home value through better energy efficiency (higher EPC rating).

• Reduces noise from outside and between floors.

• Low maintenance and long-lasting—typically effective for 40+ years.

• Government Grants, cover the full cost of works.

How long does it take to install loft insulation?

For a typical home with easy access, it takes 2–4 hours to install blanket-style loft insulation.
More complex installs (like blown-fibre, spray foam, or boarding for storage) might take a full day or more, especially with prep work like clearing old insulation or fixing ventilation.

Will loft insulation increase my home’s value?

Yes, it can. A well-insulated loft:

• Improves your home’s Energy Performance Certificate (EPC) rating.

• Makes it more appealing to buyers looking for energy efficiency.

• Can increase resale value and reduce time on the market.

It’s a smart upgrade with both comfort and financial benefits.