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Tell us about your home and whether you need new insulation, a top-up or boarding for storage.
Loft Insulation
Loft Insulation
An uninsulated home can lose around a quarter of its heat through the roof. Understand your options and find a specialist to assess your loft.
Understand your options
What is loft insulation?
Loft insulation is a layer of material, usually mineral wool, laid between and over the joists of your loft floor. It slows heat escaping through the roof. The Energy Saving Trust says an uninsulated home loses around 25% of its heat that way, and that the recommended minimum depth for mineral wool is 270mm.
Many homes already have some insulation, so the job is often a top-up. If you want to use the loft for storage, the floor needs raising and boarding so the insulation is not squashed, with a small gap left for ventilation.
Typical costs
The Energy Saving Trust puts typical installation costs in Great Britain at around £750 to insulate an empty loft to 270mm, or around £600 to top up from 120mm to 270mm. It estimates that topping up from 120mm to 270mm saves around £17 a year. Your own costs and savings depend on your home, so ask for a written quote.
These are typical figures, not prices for your home. Last reviewed September 2026. Source: Energy Saving Trust, roof and loft insulation (updated May 2026).
Tell us about your project and we will pass it to Better Home Hub, which looks for a specialist who covers your area. The specialist assesses your loft and provides the quote.
From enquiry to installation
Your next steps, made clear.
Arrange an assessment
A specialist checks the depth of any existing insulation, access, ventilation and any damp before recommending work.
Review your quote
Ask for a written scope covering materials, depth, boarding, loft hatch and pipe or tank insulation. Decide whether to go ahead.
Plan the work
Clear the loft if needed and agree a date with your installer. Ask what paperwork they will give you afterwards.
How thick should loft insulation be?
The Energy Saving Trust recommends a minimum of 270mm of mineral wool. If you have less than that, a top-up can help, although the saving from topping up an already insulated loft is smaller than insulating an empty one.
Can I still use my loft for storage?
Yes, but do not put boards straight on top of deep insulation, as squashing it makes it less effective. The floor is usually raised before boarding, with a small ventilation gap left between the insulation and the boards.
Will loft insulation cause condensation?
Insulating the loft floor makes the loft space colder, which can make condensation more likely if ventilation is poor. A good installer keeps eaves vents and other ventilation clear, and may add more. Any damp or roof leaks should be fixed first.
Do pipes and water tanks in the loft need insulating?
Yes. Once the loft floor is insulated the loft is colder, so pipes and tanks up there are more likely to freeze. Ask for them, and the loft hatch, to be included in the quote.
Are there grants for loft insulation?
Some households can get help, but schemes change. In England, the Warm Homes: Local Grant, run by councils until March 2028, can pay for insulation for eligible low-income households where the council has funding. The Energy Company Obligation (ECO4) runs until 31 December 2026, and the Great British Insulation Scheme ended on 31 March 2026. In Scotland, contact Home Energy Scotland; in Wales, Nest. We are not a government body and cannot tell you whether you qualify: check GOV.UK or your council.
Should I insulate the loft floor or the roof?
If the loft is only used for storage, the floor is normally insulated. If you are converting it into a room, the roof slope is insulated instead, and building regulations apply. A specialist can advise on your roof.
Your next step
A warmer home.
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