The Complete Guide to Social Value & Sustainability in UK Public Procurement

Social value refers to the broader economic, social, and environmental benefits an organisation creates beyond the direct goods or services in a contract. In a procurement context, it is the additional good a supplier delivers for communities and society while fulfilling a public contract — local jobs, apprenticeships, spend with small and local businesses, reduced emissions, and support for community projects.

What was once a 'nice to have' is now a scored, contractual requirement. Public bodies have been legally required to consider social value since 2012, and central government has had to explicitly evaluate it in major tenders since 2021. For any organisation that supplies, or wants to supply, the public sector, the ability to articulate, deliver, and evidence social value is now central to winning and keeping contracts.

The foundation is the Social Value Act 2012, which requires public authorities in England and Wales to consider how the services they buy could improve economic, social, and environmental wellbeing. It was the first law of its kind in the world, but its duty merely to 'consider' social value lacked teeth.

That changed with PPN 06/20 in 2020, which introduced the Social Value Model and required central government to score social value with a minimum 10% weighting in every major tender. In February 2025 it was superseded by PPN 002, which restructures the model around the government's five missions and strengthens the requirement to turn bid commitments into tracked contractual obligations.

All of this now sits within the Procurement Act 2023, the most significant overhaul of UK public procurement in a generation, which came into force in February 2025. It replaces the old EU-derived rules with a single, more flexible and transparent regime — and it strengthens contract management, requiring KPIs to be set and monitored on larger contracts, including the social value commitments suppliers make.

Because social value covers so many different outcomes, measuring it consistently is a challenge. The most widely used answer in UK local government is the TOMs framework — Themes, Outcomes and Measures — which attaches a proxy financial value to each social outcome so that impact can be expressed, compared, and benchmarked in monetary terms.

Measuring is only half the job. Social value reporting is the process of evidencing delivery against those commitments throughout the life of a contract. Under the latest rules, the promises made in a bid become contract terms and KPIs, so suppliers are increasingly held to what they pledged — making robust, systematic reporting a genuine competitive advantage.

Environmental impact is a large and growing part of social value. The headline commitment is net zero — balancing the greenhouse gases an organisation emits with the amount it removes. The UK has a legally binding target to reach net zero by 2050, and suppliers bidding for larger central government contracts must publish a Carbon Reduction Plan to be eligible.

Credible carbon management starts with measurement, which is where Scope 1, 2 and 3 emissions come in — the three categories that classify an organisation's carbon footprint, from direct emissions through to those across its entire supply chain. Many organisations also disclose their environmental performance through CDP, the world's most widely used environmental disclosure system, which is increasingly cited as a marker of credibility in tenders.

Sitting above all of this is ESG — Environmental, Social, and Governance — the broader corporate framework used by investors and regulators to assess sustainability and risk. ESG and social value overlap heavily: strong ESG performance underpins strong social value delivery, and many organisations manage both through a single sustainability strategy.

UK social value does not exist in isolation. The UN Sustainable Development Goals — 17 global objectives covering everything from poverty and inequality to climate action — provide a shared, internationally recognised language for impact. The National TOMs framework explicitly maps its outcomes to the SDGs, so organisations can show how their contract delivery contributes to global priorities, and many contracting authorities now expect suppliers to demonstrate that alignment.

Taken together, these laws, frameworks, and concepts describe a single shift: public sector buyers now expect suppliers to create measurable wider value, to align with recognised frameworks, and — crucially — to prove delivery rather than simply promise it. The organisations that do this well treat social value not as a bid-writing exercise but as something they measure, manage, and report on continuously.

That is exactly the problem ImpactOS is built to solve. ImpactOS helps organisations measure, map, and report social value and sustainability data across all their public sector contracts and frameworks — turning scattered spreadsheets into a single, evidence-backed source of truth. Explore the explainers below to go deeper on any topic.