upvc double glazed doors

What does a Window or Door Energy Rating (WER) Cover?


Window Energy Rating Labels or WER’s are a grading system for energy efficiency in double glazed windows and doors.

The label identifies some of the main characteristics of the whole replacement unit not just the double glazing itself.

Areas covered by the label are the ‘U’ value, what the (effective) heat loss will be due to air coming in an out (leakage) and ‘solar heat gain’ or how much heat it will let in, but not let out.

The whole labeling is based on the traffic light colours with green being the most & red being the least energy efficient – it is also alphabetical from A to G with the very best windows getting A+ or A++ ratings for having excellent energy efficient characteristics.

Window and Door Energy Ratings

Using Accredited Window & Doors Installers – Choosing the most suitable company

With hundreds of companies across the UK offering new windows or doors, maybe you should create yourself a list or work off a buyers guide.

Buying replacement doors, or even a single window, can be quite a costly experience, not only for the initial cost, but also for putting things right if you have a bad job done.

There are horror stories about, but if you do your homework first, you can avoid the pitfalls. Here is a very good guide: The top 5 reasons to fit new UPVC Patio doors to your home.

Quick Buyers Guide

Make sure your installer is a member of a trade body such as, or similar to:

  • GGF
  1. Get lots of quotes – compare prices from at least 4 different companies
  2. Get references from previous customers
  3. Get it in writing – everything you can
  4. look for insurance backed deposit guarantees
  5. look for workmanship warranties
  6. Check their customer service record
  7. Don’t buy “on the night” take a few days at least to consider your decision
  8. check for planning permission & building regulations
  9. Tell your neighbours before you start work – (that there may be some disturbance)

Always take your time, don’t rush any decision – remember, decide in haste, repent at leisure.