Here you will find useful information, links to information and products.

Information always being added/updated.



Panel Cut Outs

Adding any size flap into a door panel is as simple as turning up and cutting out the hole and installing the flap. If the flap is going into an existing panel, then this is a charged at £40 per cut-out and install. If a new panel is needed then I would need to get a quote for a new panel from my supplier and this would then be added to the £40 install charge.

Glass Cut Outs

Getting a cat flap hole put into a double glazed unit isn’t as straightforward as turning up and cutting out a hole. You would need to start from scratch and have a new double glazed unit made to measure with the right size cut-out. This will be a new sealed unit with the same spacerbar used for the sides of the glass around the cut-out. (see below picture)

Normally a round cut out is 215mm in diameter and needs to be 100mm from the bottom of the glass and 50mm from the sides.

PLEASE NOTE – Not all flaps are round, a square hole will cost about 4x more to put into a sealed unit than a round hole. This is because the process of having 4 corners cut into the glass makes the sealed unit weak. You can buy a mounting adapter which will hide a round hole when installing a flap that’s not round.


Condensation is not caused by double glazing (although new windows can sometimes make a condensation problem worse, by cutting out draughts).

Condensation on the inside of double glazed windows

Condensation happens when water vapour in the air changes to liquid water. There can be many causes but put simply it generally occurs in the atmosphere when warm air rises, as it cools down it loses its capacity to hold water vapour. Water vapour then condenses on cool surfaces to form liquid water which is why often you will see windows with condensation on them.

Treatment for condensation is ventilation (to vent moisture-bearing air to the outside) and heating (to raise surfaces above dew point temperature).

Condensation on the outside of double glazed windows

External condensation (dew) can occasionally occur on highly insulating glass units in temperate climates. Such occurrences will only happen on cloud-free nights when there is little or no wind and usually when a warm front follows a dry spell.

With modern Low E Glass products more of the heat is kept inside and the outer pane is not heated as much. Moisture condenses out of the air onto a cold surface that is said to be below the dew point.

In short, the “problem” is caused by the fact that the Low E Glass is doing its job so well and reflecting heat back into the room that there is nothing to worry about if you see external condensation on your new double glazed windows.

Condensation between both glazed panels

If you find condensation/moisture inside your glass, then the sealed unit itself has broken down and has started pulling in moisture.

This may be because the unit is old (over time it has broken down) and will need to be replaced or if the sealed unit is new, then the seal around the unit was just not sealed off properly in the factory and has started pulling in moisture.

For more information on condensation, click here.


Because of the nature of the glass production process, glass surfaces free of any marks cannot be guaranteed. I will try my best to resolve any issues you have but the standards set out by The Glass and Glazing Federation (GGF) are final with the Window & Door factories. For more information on scratches, blisters and hairlines, click here.


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