Secondary Glazing: Is it Worth it?

secondary glazing installed on a window
(Image credit: Ventrolla)

Secondary glazing provides a potential solution for improving the energy efficiency of single glazed window styles in your home. Installing secondary glazing sees the existing windows left in place and another pane of glass or Perspex installed inside to form something approximating double glazing. 

It’s an idea that’s attractive to a lot of people, especially when dealing with draughty single glazed windows, as an alternative to the costly process of replacing windows completely. 

Tim Pullen

Tim is an expert in sustainable building methods and energy efficiency in residential homes and writes on the subject for magazines and national newspapers. He is the author of The Sustainable Building Bible, Simply Sustainable Homes and Anaerobic Digestion - Making Biogas - Making Energy: The Earthscan Expert Guide.

His interest in renewable energy and sustainability was first inspired by visits to the Royal Festival Hall heat pump and the Edmonton heat-from-waste projects. In 1979

this initial burst of enthusiasm lead to him trying (and failing) to build a biogas digester to convert pig manure into fuel, at a Kent oast-house, his first conversion project.

Moving in 2002 to a small-holding in South Wales, providing as it did access to a wider range of natural resources, fanned his enthusiasm for sustainability. He went on to install renewable technology at the property, including biomass boiler and wind turbine.

He formally ran energy efficiency consultancy WeatherWorks and was a speaker and expert at the Homebuilding & Renovating Shows across the country.