Online price
Calculators
Help and Information

Window Energy Ratings (WER's).
Window enery ratings are A,B,C,D,E,F...just like the labels on new refrigerators, washing machines etc. The diagrams show A as the highest rating...most energy efficient and F as the lowest rating...least energy efficient.
Since October 2010, building regulations require that a MINIMUM of C rating is used (or at least a U value of 1.6w/m2).
Our standard windows comply with the minimum rating of C, however, we can easily upgrade to B or A rating for a small additional cost and, so that you can easily compare prices for each, our calculators have this facility built in.
The energy ratings A,B,C,D,E. are rated on a scale according to the energy lost though the window in one year...this is experessed as a negative number of KWH/M2/year.........Kilowatt hours/heat loss per square metre of window/per year
Energy rating scale 
KWH/Sq. Metre/Year (heat loss) 
A 
Loss of 0Kw/H per year or a gain of 'x' KwH/ per year (ours = A+10...a gain of 10KWH/ per square metre per year) 
B 
Loss to 10KwH/per sq.m per year. 
C 
Loss of 10 to 20 KwH/per sq.m per year. 
D 
Loss of 20 to 30 KwH/ per sq.m per year. 
E 
Loss of 30 to 50 KwH/ per sq.m per year. 
F 
Loss of 50 to 70 KwH/per sq.m per year. 
How much could you save?
By installing double glazing in an entirely single glazed house you could save the following each year:
Energy rating 
Detached 
Semi detached 
Mid terrace 
Bungalow 
Flat 
A rated 
£130  £175 
£90  £120 
£80  £105 
£60  £80 
£50  £65 
B rated 
£120  £160 
£80  £110 
£70  £95 
£50  £70 
£40  £60 
C rated 
£120  £150 
£80  £105 
£70  £90 
£50  £65 
£45  £55 
These savings are for typical gas heated homes.

A loss of 10kwH per sq.m per year is equivalent to paying for a fire like this to be on for 10 hours each year outside, for every sq metre of glass in your home.
An A+10 rated window will provide you with 10KwH energy per sq m of glass each year inside for no increase in your energy bills. 