Energy

Window Insulation Film Kit

£9.99Savings vary

Apply the tape, stretch the film and warm it with a hairdryer for a clear, taut finish. The film traps a layer of air over the glass as a simple, temporary form of secondary glazing, and peels off in spring — a renter-friendly option where replacing windows isn’t possible.

Covers up to 5 windows
Clear when shrunk
Includes double-sided tape
Removable, renter-friendly

Coming soon

Not on sale yet — we’re still researching products and confirming suppliers.

Your savings, honestly explained

Savings vary

The Energy Saving Trust describes secondary glazing film as a cheaper DIY option that “offers the least thermal benefits” of the secondary glazing types, doesn’t last long and can be hard to make look neat. It doesn’t publish a saving for film. Its figure of around £85 a year is for installing A-rated double glazing throughout a fully single-glazed semi-detached home, and doesn’t apply to this kit. We couldn’t find reliable independent evidence for a yearly saving from window film, so we don’t claim one.

What your saving depends on

Whether your windows are single glazed (little benefit on double glazing)
How well the film is fitted and sealed
How your home is heated and your fuel prices

Sources

Energy Saving Trust: Energy efficient windows and doorsLast updated 20 May 2026

Figures are for Great Britain unless stated. We cite this guidance independently — these organisations haven’t tested, approved or endorsed this product or our shop.