How to install timber windows

Timber windows aren’t a thing of the past. Their quality and engineering means they’re available pre-finished, double or triple glazed, with enhanced security and comprehensive warranties to give your customers peace of mind.

Windows can be delivered to site fully finished - coated, glazed and fitted with hardware in controlled factory conditions. While some can be supplied with a primer or stain base coat for site glazing and finishing, it is advisable to choose factory-finished windows, where possible.

Get the timber window basics right 

• Units should be brought to site as close to installation time as possible - and don’t use metal storage containers as excessive heat can damage the products
• Don’t store the units in a damp room or building, particularly where plastering will be carried out
• Avoid storing products flat - water lying on a horizontal window or door will cause the timber to swell and will invalidate the warranty
• Plan to install and seal the new windows and doorsets on the same day that the existing windows or doorsets are removed
• Install insulated cavity closers - specific guidance on installation will be available from the manufacturer
• Ensure you seal the gap between the window or doorset and the opening to repel water and prevent air leakage while allowing for any movement that might occur
• Make sure impregnated foam tapes used for sealing remain permanently flexible to accommodate at least the same joint movement as a ‘wet’ sealant

For more detailed instructions download Installation Guidelines for Timber Windows produced by the Wood Window Alliance, which represents more than 30 of the UK’s leading wood window companies.

Further reading

Other articles you may like: Upgrading historic buildings and Avoid cold bridging on bay windows.

Please Note: Every care was taken to ensure the information was correct at the time of publication. Any written guidance provided does not replace the user’s professional judgement. It is the responsibility of the dutyholder or person carrying out the work to ensure compliance with relevant building regulations or applicable technical standards.