Green book

'The Green Book: Appraisal and Evaluation in Central Government' is produced by HM Treasury. It provides a structure for the appraisal of proposed central government projects, policies and programmes, and for the evaluation of existing projects, policies and programmes. The Green Book is supported by a range of supplementary guidance.

The Green book is intended to cover the following activities:

• Policy and programme development.
• Capital projects.
• Use or disposal of existing assets.
• Specification of regulations.
• Major procurement decisions.

The Green Book sets out transparent and consistent procedures for assessment and evaluation to ensure that public funds are spent efficiently and are spent on proposals that will be of the greatest benefit to society.

Broadly, the stages of development of a project, programme or policy are described as:

• Justify action.
• Set objectives.
• Appraise options.
• Develop and implement the solution.
• Evaluate.

Assessment is the process of deciding whether the proposal should go ahead or not, and which option to pursue. Assessment should includes economic, financial, social and environmental impacts and includes the following overall processes:

• Identify alternative approaches.
• Attach monetary values to impacts.
• Carry out cost/benefit analysis of options.

The Green Book suggests that the issues that should be considered as part of an assessment might include:

• Strategic impact.
• Economic rationale.
• Financial arrangements and affordability.
• Achievability.
• Commercial and partnering arrangements.
• Regulatory impact.
• Legislation.
• Information management and control.
• Environmental impacts.
• Rural issues.
• Equality.
• Health
• Health and safety.
• Consumer focus.
• Regional perspectives.
• European Union.
• Design quality.

The 2020 Budget included an announcement that the Green Book would be reviewed. The Green Book was subsequently updated in 2020 to end the dominance of benefit cost ratio in appraisals.

The Green Book was then updated in February 2026 to ensure decisions are no longer based solely on single metrics such as benefit-cost ratios but take into account the full range of economic and social impacts that matter for growth. That could include how favourable the business environment is or where there are higher levels of innovation.

[edit] Related articles on Designing Buildings

• Additionality.
• Blue book.
• Business plan.
• Common Minimum Standards.
• Common standards.
• Development appraisal.
• Ensuring a green recovery beyond the pandemic.
• Government Construction Strategy.
• Government publishes UK infrastructure strategy.
• Investing in infrastructure for London.
• Major Projects Authority.
• OGC.
• Preliminary business case.
• Procurement route.
• Public procurement.
• Red book.
• Why we should be more positive about our ability to deliver major projects.

[edit] External references

• View the Green Book online, in full.