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Sealed units

Quality sealed double glazed units.

We can make any combination of sealed units, any shape, any size.

No job is too big or small.

We can create toughened sealed units, we can create oversized units that other companies cannot make, up to 3.3m x 3.3m. We can also make triple glazed units.

We use the latest technology available, and are constantly upgrading our equipment to keep up with the latest industry trends.

We can supply to the smallest individuals to the largest sealed unit users, such as government, council or large window companies.

Our sealed units conform to the EN 1279 European standard, for which we get audited each year for quality.


What is Window Energy Rating (WER)?

The WER is the objective method used to asses the total energy performance of a windows. To determine the energy rating the following is criteria is used:

  • Frame material used (PVC, aluminium or timber)
  • Glass used
  • Air leakage
  • Solar Gain

The BFRC (British Fenestration Ratings Council) rating system is designed to determine a window’s thermal efficiency. It is displayed on a colour-coded traffic-light style label with a scale from ‘A’ (the most efficient) – to ‘G’. This means that you can make a quick yet informed decision when choosing new windows, taking energy conservation into account.

With carbon emissions and other environmental issues high on the global agenda, we are all looking for ways to make our homes more energy efficient. Combined factors, such as solar gain, result in the fact that the ‘A’-rated window is energy-positive, meaning it can absorb more energy into the house than it lets out.

To see how much money you could save on your energy bills and to find out how significantly you could reduce your carbon footprint, use the 'Carbon Calculator' on

KJM 'C'-rated windows have a warm edge spacer, are argon gas filled and have low e glass. The enhanced 'A'-rated window, has the best warm edge spacer on the market, be argon gas filled, soft cost low e glass and the external pane is manufactured from 'low iron' glass to improve the solar gain.