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The Green Book is the governments guidance on options appraisal and evaluation.
From 1 November 2023, Ministers of the Crown have a legal duty to have due regard to the environmental principles policy statement when making policy. Where the duty applies, it is relevant for appraisals and evaluations that are conducted in line with the Green Book. This duty will be reflected in the Green Book when the document is next updated. Further information can also be found in the guidance onEnabling a Natural Capital Approach. The Green Book also contains details of the other statutory duties with which appraisals must comply.
Useful resources
Green Book practitioners and reviewers may benefit from the wider collection of accompanying guidance and materials including training and templates and support materials.
Previous editions of the Green Book
The previous 2003 edition of Green Book guidance is now withdrawn. For purposes of academic study and public information it may be found on the National Archives website.