The next windows you choose could save you as much as 20% on your energy bill...

Your home made more thermally efficient

" more and more people opt for 'A' Rated Windows as an energy saving measure..."

The window and door profiles used to make the frames for your home offer excellent thermal insulation, as the gaskets and weathertight seals shut out draughts while the glazing reflects the heat back in to your room.

The multiple chambers within the profiles and the option of using Recycled Thermal Reinforcement (RTR) Bar also greatly improves the heat loss from your home. Aspects that will greatly reduce energy bills.

The benefits of energy-efficient windows (and doors!)

  • Smaller energy bills: replacing all single-glazed windows with A-rated double glazing could save you hundreds of pounds per year on your energy bills.
  • A smaller carbon footprint: by using less fuel, you’ll generate less of the carbon dioxide that leads to global warming - typically, 680kg a year.
  • A more comfortable home: energy-efficient glazing reduces heat loss through windows and means fewer draughts and cold spots.
  • Peace and quiet: as well as keeping the heat in, energy efficient windows insulate your home against outside noise.
  • Reduced condensation: energy-efficient glazing reduces condensation build-up on the inside of windows.

The costs and savings for energy-efficient glazing will be different for each home and each window, depending on the size, material and installer. Double glazing should last for 20 years or more.

What are window (and door) energy ratings?

A window or doors rating is determined by a formula which takes into account the total solar heat transmittance, the amount of the sun's heat which can pass through the glass (usually referred to as g-value); the U-value of the whole unit (frame and glass combined), how well the window or door keeps the heat in your home; and the air infiltration through the window or door seals.

To make the Rating standard across all products, a standard window / door size and configuration is used. The resulting value is then placed into a band on the scale G-A, with A-rated windows and doors being the most energy-efficient. This makes the system of rating windows and doors consistent with other products which have energy performance labels such as those that will be familiar on washing machines, light bulbs and refrigerators.


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You can find your local fabricator / installer of windows and doors, using our FIND AN INSTALLER feature.

Alternatively, why not design your own windows and doors on our fantastic WINDOW & DOOR DESIGNER software, where once submitted will send it to your local installer for quoting!