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Everything you need to know before buying Windows, Doors or a Conservatory


Which standards are worth having and which are just sales talk?

 Virtually all profile extruders, fabricators and sealed unit manufactures have the relevant   BSI Kite marks. You will be very hard pushed to find a product without it, so this is no guarantee of quality


 Essential if you want an ‘A’, ‘B’ or ‘C’ rated window as this is the only organization that can award these, no guarantee of quality, just energy efficiency



 The Glass and Glazing federation is one of the oldest trade bodies within the double glazing industry. Although they offer a certain amount of protection, no more than any other warranty.  Remember the GGF are a business too and their aim is to make money


You will need either Fensa, Certass of the building control when installing new windows, but as they only inspect 1 - 3% of installation don’t really on this as a guarantee the company is competent.


As Above

The is quite a high end accreditation and although not essential show a level of commitment to the manufacture of the product, but not the installation.  The BBA test products to last for 20 years



This is also a manufacturing accreditation and not a standard specification, it must be specified at point of manufacture as certain things are changed such as anti-bump cylinder, laminated glass to ground floor windows etc.  Normally used on commercial products and by local council not usual for domestic installations



7th May 2010

The new Document L has been approved and will become law as from the 1st October 2010. This requires any windows installed in residential properties to be ‘C’ rated or better or a U-value no worse than 1.6 W/m2k. For more information check out the New Document L1A

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