Developments in timber window design and finishing products mean that modern, high performance timber windows need minimal maintenance and potentially have a significantly longer life than PVC-u. Though maintenance of high performance timber windows is easy and minimal some may consider that they are not suitable for high rise buildings. In the UK the National Housing Federation and some local authorities have found PVC-u window frames to be more expensive in terms of initial capital cost and more expensive or equal to timber over the lifetime of the windows. Reclaimed wood or local timbers can be used. In general wooden windows can last for over fifty years and even after that time can be renovated whereas PVC windows have to be totally replaced after 20 - 25 years.
Timber is repairable, adaptable and durable.
From well managed sources it is a sustainable, environmentally friendly resource. Independent certification by the Forestry Stewardship Council should be sought as proof of acceptable forestry practices. As long as care is also taken in the choice of preservatives, paints and stains, timber windows are by far the best environmental choice. Other Polymers - In Berlin, where PVC restrictions on building are in force, new polyolefin windows from were installed by the City Council in May 1996. Ceramic tiles and marble are highly durable.