Green Book 2026: A Real Opportunity For Place-Based Growth, If We Get the Delivery Right

HM Treasury’s updated Green Book (February 2026) marks an important shift in how public investment decisions are made.

It places much greater emphasis on place-based analysis, distributional impacts and long-term economic transformation. Crucially, it moves away from over-reliance on a single headline benefit–cost ratio (BCR). Instead, value for money is framed as a balanced judgement, drawing on monetised and non-monetised impacts, risk and uncertainty, and how benefits and costs are distributed across different

places and groups.

That’s a meaningful change.

For Sheffield and South Yorkshire, this matters. The region’s growth ambitions depend on coordinated packages of transport, housing, skills and innovation investment, not isolated schemes assessed in silos. The updated guidance embeds place-based analysis within appraisal and requires sub-national impacts to be presented where relevant. This reflects the findings of the 2025 Green Book Review, which identified an overemphasis in practice on BCRs and insufficient treatment of strategic and spatial impacts.

The revised document is also shorter and explicitly designed to improve usability and speed up decision-making. If that intention translates into practice, streamlined appraisal processes could reduce approval times and provide greater certainty for developers, infrastructure providers and investors.

But there are still important delivery questions to address.

The challenge of “place-based business cases”

Treasury guidance remains clear: appraisal must demonstrate additionality, define a robust counterfactual and avoid double counting. Those principles are sound.

However, when projects are genuinely interdependent, for example, where transport investment unlocks housing growth, applying these rules consistently becomes technically complex. Without clear integration rules, there’s a real risk of either overstating combined benefits or underestimating transformational impacts.

Both outcomes are problematic.

Governance still matters

There is also a governance issue to resolve. Business cases continue to sit within departmental assurance structures. So where a place-based package spans transport, housing and skills, multiple departments may still need to approve elements separately.

Without a clearly defined cross-departmental route, promoters can face sequential approvals, repeated scrutiny and delays while funding responsibilities are negotiated. For areas bringing forward integrated growth programmes, this increases uncertainty and slows delivery, precisely the opposite of what reform is trying to achieve.

Old habits can persist

Although the 2026 guidance reiterates that decisions should not rely solely on the BCR, the 2025 Review documented how strongly behaviour still gravitates toward that metric in practice.

Where cross-sector benefits are harder to monetise, there remains a risk that decision-makers default to narrower quantitative indicators, even if the framework now allows broader judgement.

The recently published Northern Appraisal Playbook (TfN, February 2026) underlines why this matters. It confirms that travel time savings typically account for the majority of monetised benefits in transport business cases, and therefore exert significant influence on value for money conclusions.

It also acknowledges that current methods tend to favour longer-distance business travel and can understate the value of shorter urban journeys and time-pressured users. In a compact city-region like South Yorkshire, where improving local access to employment is central, this weighting can materially affect how schemes such as tram extensions are assessed.

The Playbook further questions the assumption that new jobs are largely displaced from elsewhere in the country, and highlights the difficulty of properly capturing housing and regeneration impacts within existing appraisal guidance.

In places with underused labour, constrained viability and significant brownfield opportunity, like South Yorkshire, that can result in projects being judged primarily on narrow transport efficiency metrics, rather than their contribution to economic restructuring and place renewal.

A genuine opportunity, if it’s used well

The direction of Green Book reform creates a real opportunity.

If tram extensions in South Yorkshire are framed and evidenced as part of integrated growth programmes, supported by robust analysis of accessibility gains, labour market participation and development delivery, the case aligns much more clearly with the intent of the 2026 framework.

The task now is to present the full economic story with enough clarity, rigour and analytical discipline that it cannot be reduced to minutes saved.

The framework has shifted in a constructive direction. The question is whether implementation, both technically and institutionally, will follow.