Windows at KeepWarm Ltd

Window Design

Because we manufacture your windows right here in our own factory we are not restricted to supplier design limitations. We can tailor your windows to your exact needs and using our unique on-line window designer you will find that we are sure to produce your exact window style.

Window energy rating (WER)

As standard you will receive an ultra efficient 'A' rated window. Our latest casement windows utilise some of the most advanced double glazing on the market and actually now perform better than a standard A rated window, in fact a rating of A+9 one of the most advanced in the country. Our windows easily exceed building regulations so you will have the peace of mind that you are installing the very best double glazing.

Home Energy Efficiency

Our energy efficient windows will make a real difference in the winter and reduce your home's energy bills as a lot of heat is lost through the windows. The special coating on each pane of glass reflects heat back into the room. All of our windows are filled with argon gas which is extremely effective in reducing heat loss as it has a higher density than air. New triple glazed windows!

For even higher energy efficiency, we now manufacture the next generation of windows, triple glazed windows. Using the same advanced glass specification as our standard 'A' rated window our triple glazed window adds an additional pane of energy efficient Pilkington KS glass, achieving an 'A+' rating which is reserved for the highest performing windows as described by the BFRC.


Our windows have high security built in. Our locking system is sourced from Yale and with the option of shootbolt locking ensures a highly secure window. All of our windows are internally beaded which means that the glass can only be removed from the inside. All window handles have key locking. All our windows have a two stage locking system where the window is completely closed on the first setting but allows airflow through a small gap on the second setting, while still being locked.

Window profiles

Our profile extrusion is supplied by Profile 22, one of the leading extruders in the country. We use an attractive 70mm system which has a sculptured finish.


In order to achieve such a highly energy efficient window we only use the latest glass technology from Pilkington known as Pilkington EnergiKare. All windows are supplied with the following glass make-up:

  • Inner pane – Pilkington KS
  • Outer pane – Pilkington Optiwhite
  • Gas filling – Argon Gas
  • Spacer bar – SuperSpacer

In addition, you may also add Georgian bar, Square lead or Diamond lead decoration to your glass.

Other hardware & Ancillaries

Our handles, hinges and other parts are of extremely high quality, sourced from reputable companies.


All of our window designs are available in white, rosewood and light oak. You also have the option of having a white finish on the inside and rosewood or light oak on the outside.


We have invested heavily in our machinery to ensure both accuracy and a high quality finish. Our quality control system ensures that each window leaves our factory to the highest standard.