Updated Green Book: appraisal changes and design implications for UK engineers
Reviewed by Joe Ashwell

First reported on New Civil Engineer
30 Second Briefing
The Treasury’s updated Green Book, issued in February, overhauls appraisal guidance for UK infrastructure by moving beyond narrow benefit–cost ratios and gross value added to include distributional impacts, place-based outcomes and long‑term resilience. New requirements to quantify social value, net‑zero alignment and climate adaptation are expected to change how options are sifted and how business cases are structured for major schemes such as rail upgrades, flood defences and urban regeneration. For engineers, this signals closer scrutiny of whole‑life carbon, asset performance under future climate scenarios and benefits to left‑behind regions.
Technical Brief
- Appraisal templates are being restructured so non-monetised impacts sit in the core economic case, not appendices.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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