Why shouldn't I replace my windows with plastic alternatives?

When considering replacing period timber windows with modern uPVC alternatives, we need to consider the impact on our environment. Extensive research has been undertaken by many to look at the energy cost of replacement windows, and further information on these implications can be found in our Green Issues section of the website.

Research conducted by RICS’ Building Cost Information service (BCIS) formed part of RICS’ response to the Governments UK Housing Green Paper, gives the facts below on replacement uPVC.

“Payback times for Energy Performance Certificate (EPC) energy improvements, on an average three bedroom terraced house, range from 5 years for cavity wall insulation, to 208 years for solar heating. 

Alarmingly, the next most viable energy improvement is loft insulation which will take homeowners 13 years before they begin to notice any real cost savings.

On average people spend 16 years living in one property, which makes the EPC energy saving measures financially unattractive options for over half of all homeowners. 

Other common energy saving measures include double glazing (124 years pay back), boiler replacement (38 years pay back), and under-floor insulation (61 years pay back)”.

The clear message is that if we are to advise customers of such energy saving measures, we must all be aware of where the facts and figures derive from and therefore what their agenda is.  

However, often the most important issue for property owners centres around cost implications, and most often renovating existing materials is more cost effective for the customer than complete replacement.

In addition, modern uPVC windows can often have problems of their own, including:
•    Breakdown of the sealing gaskets, allowing water ingress and condensation between panes
•    The probability of warping and discolouration
•    The breakdown of locks, catches and hinges

Whereas original windows:
•    Are made from seasoned wood by skilled craftsmen
•    Have usually withstood centuries of wear and will continue to outlive modern substitutes made from inferior materials

Note: Properties within Conservation Areas may have difficulty with planning permission when replacing period windows with uPVC.

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