Replacement windows

If windows cannot be repaired, have them replaced by high performance windows with double or triple glazing and low emissivity glass.

Replacing windows is a job for the professionals!

Timber window frames are made from a renewable material and can easily be maintained and renovated. Timber frames with a metal outer coating should last even longer.

There is a UK energy rating scheme for windows — windows with exceptionally good performance obtain an A or B rating under the BFRC scheme.

Replacing the single glazing in timber windows with double-glazing units is sometimes an option — but even if there is enough space to fit them, they’ll make the windows heavier so you’d also need to have the sash weights or hinges upgraded.

U-values — windows

A common way to describe the performance of windows is the ‘U-value’: 1.1 is exceptionally good, 1.8 is very high performance.

U-values give an indication of how easily heat can be lost from the air in rooms through parts of the building, including windows. Window frames and glazing with low U-values will reduce heat loss — the lower the U-value the better.

Building regulations have gradually increased insulation standards. The levels of insulation depend on the date that the building warrant was granted, not when the house was built.

There weren’t any requirements for insulated windows until 1991. Until then, windows had U-values of about 4.8. By 2002 the building regulations required 2.0 for windows with wood or PVC frames, 2.2 for windows with metal frames — or a lower U-value if the boiler is old or inefficient.

Savings — [Savings information from EST]

Around 20% of the heat in a house will be lost though single glazed windows. By fitting new double glazing with Low-E glass and draught free frames you could reduce this loss by half. For an average three bedroom house this could result in a saving of £70 to £100 a year on the energy bill.

Check with the local Planning department for any work that would affect the appearance of your building — you may not be allowed to change the type of windows.

There is a UK energy rating scheme for windows — windows with exceptionally good performance obtain an A or B rating under the BFRC scheme.

Replacement windows must meet current U-values

BFRC (British Fenestration Rating Council) lists ratings for windows at

www.bfrc.org