High performance external doors

Replacing your old door with a high thermal performance door can keep your home warmer and reduce your fuel bills.

High performance external doors are designed to keep your home warmer and more airtight. They can be constructed of PVC-U, aluminium, timber or a combination of these materials. They often have panels of double or triple glazing with a thermal barrier between the panes of glass (either air or an inert gas like argon) which prevents heat passing through. The double or triple glazing has the added bonus of cutting out noise from outside.

Not only are modern doors better insulated, but they are also likely to fit much tighter in the door frame and therefore reduce draughts.

How do you measure the energy efficiency of a door?

An energy efficient door is one that keeps the heat in effectively, and stops it escaping to the outside. Like fridges, washing machines and other appliances, new doors are given an energy efficiency rating from A-G, with A being the most efficient. Anything less than an E won’t meet the building regulations currently in force in England and Wales.

The rate at which heat is lost through a door (including its frame) is described as its ‘U-value’. The lower the U-value, the slower the heat is lost from the house and the more energy efficient the door is. Doors must have a U-value of 1.8 or less to meet building regulations.

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