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The 25 year figure is just the assumed lifetime by DECC for the purposes of defining the maximum period that a Green Deal loan can be taken out over.
The Green Deal requires that there is a 5 year Installation Guarantee - apart from cavity and solid wall insulation which needs 25 years. This requires the GD Provider to rectify all problems with the installation free of charge. (I assume they will cover this in their contract agreement with a Green Deal Installer but maybe they will self-insure this aspect in order to save money).
And there also has to be a Consequential Damage Guarantee for 10 years from the date of installation, covering the building fabric.
Details are here - http://www.legislation.gov.uk/ukdsi/2012/9780111525227/schedule/3
The Green Deal requires that there is a 5 year Installation Guarantee - apart from cavity and solid wall insulation which needs 25 years. This requires the GD Provider to rectify all problems with the installation free of charge. (I assume they will cover this in their contract agreement with a Green Deal Installer but maybe they will self-insure this aspect in order to save money).
And there also has to be a Consequential Damage Guarantee for 10 years from the date of installation, covering the building fabric.
Details are here - http://www.legislation.gov.uk/ukdsi/2012/9780111525227/schedule/3