Biodiversity Net Gain: From Policy Innovation to Market Reality

Prompted by reading this sharp, analytical assessment from Matthew Townsend and his team at A&O Shearman, today’s article looks at the challenges, opportunities, and next phase of nature-positive growth for Investors and wider society.

The UK’s introduction of Biodiversity Net Gain (BNG) marks a decisive shift in how environmental considerations are embedded into economic activity. As Matthew Townsend of Shearman & Sterling outlines, BNG moves beyond the long-standing principle of “no net loss” to impose a positive obligation: development must actively enhance biodiversity.

This is not just a regulatory adjustment—it is a structural change in how land, capital, and environmental value intersect.

At a time when global attention is intensifying—evidenced by the launch of biodiversity credit policy discussions at COP30—BNG places the UK at the forefront of an emerging nature economy. But as with any early-mover advantage, the path forward is defined as much by its challenges as by its opportunities.

🌱 The Promise of BNG: Embedding Nature into Decision-Making

At its core, BNG seeks to correct a fundamental imbalance: the historic externalisation of environmental costs. By requiring a minimum 10% improvement in biodiversity, measured and maintained over 30 years, the policy forces developers to internalise nature as a material consideration.

This aligns closely with broader frameworks such as the Convention on Biological Diversity and its Kunming-Montreal Global Biodiversity Framework, as well as emerging disclosure standards like the Taskforce on Nature-related Financial Disclosures.

The implication is clear:

Nature is no longer peripheral—it is becoming integral to financial and strategic decision-making.

⚠️ The Immediate Challenge: Friction in Implementation

Despite its ambition, BNG’s rollout has not been without difficulty.

1. Planning Delays and Administrative Burden

One of the most pressing concerns has been the impact on planning timelines. Developers are required to:

• conduct baseline biodiversity assessments

• apply DEFRA’s metric

• prepare detailed biodiversity gain plans

In practice, this has introduced complexity and delay, particularly where:

• local authorities lack capacity

• guidance is interpreted inconsistently

The result is a tension between:

• policy ambition

• and delivery capability

2. Cost Inflation and Market Uncertainty

BNG introduces new cost components:

• on-site habitat creation

• off-site biodiversity units

• statutory credits (as a last resort)

While these costs are intended to reflect environmental value, they can:

• increase project costs

• affect viability

• deter investment in marginal developments

For international investors, the concern is less about the existence of regulation and more about:

predictability, pricing, and consistency

3. Supply Constraints in Biodiversity Units

A functioning BNG system depends on a liquid and transparent market for biodiversity units.

Currently:

• supply of off-site units is uneven

• pricing is not yet standardised

• verification processes are still evolving

This creates a risk of:

• bottlenecks

• inflated prices

• uneven access

4. Capability Gaps

BNG requires expertise across:

• ecology

• data analysis

• legal structuring

• land management

Many organisations—particularly smaller developers—lack:

• internal capability

• access to specialist advice

This raises the risk that BNG becomes:

a compliance exercise rather than a strategic opportunity

🌍 The Strategic Opportunity: Building a Nature Economy

While the challenges are real, they should not obscure the transformational potential of BNG.

1. Creation of a New Asset Class

BNG is catalysing the emergence of:

• biodiversity units

• nature-based credits

• land-based environmental assets

These have the potential to become:

a new class of investable assets, analogous (though not identical) to carbon markets

For landowners and investors, this opens opportunities to:

• monetise ecological enhancement

• diversify income streams

• align financial returns with environmental outcomes

2. Strategic Land Management

Forward-thinking organisations are already shifting from:

site-by-site compliance

to:

portfolio-level optimisation

This involves:

• identifying “core” biodiversity sites

• generating units at scale

• allocating them across multiple developments

The result is:

• greater efficiency

• reduced cost

• enhanced strategic control

3. Integration with Financial Decision-Making

BNG data can feed directly into:

• TNFD disclosures

• risk assessments

• investment strategies

This creates a bridge between:

• regulation

• and financial reporting

Over time, this integration may:

• improve transparency

• support better capital allocation

• enable more informed risk pricing

4. Growth of Supporting Industries

BNG is driving demand for:

• environmental consultancy

• ecological surveying

• data and verification platforms

• legal and advisory services

The UK, with its strong professional services sector, is well positioned to:

lead in these areas globally

5. Reframing Development

Perhaps most importantly, BNG changes how development itself is perceived.

Instead of:

development vs environment

the model becomes:

development with measurable environmental enhancement

This has implications not just for planning, but for:

• corporate reputation

• stakeholder engagement

• long-term value creation

⚖️ The Central Tension: Speed vs Integrity

BNG sits at the intersection of two powerful forces:

• the need for rapid infrastructure and housing development

• the need for environmental restoration and resilience

The UK’s ambition to deliver 1.5 million homes underscores this tension.

If BNG is:

• too rigid → it risks slowing growth

• too flexible → it risks losing credibility

The challenge is to strike a balance where:

integrity of outcomes is maintained without undermining delivery

🔍 What Comes Next: From Compliance to Strategy

Short Term (6–12 months)

• regulatory refinements (e.g. exemptions for minor developments)

• increased clarity on implementation

• ongoing capacity challenges

Medium Term (12–18 months)

• shift from compliance to optimisation

• emergence of portfolio-level strategies

• greater use of BNG data in reporting and decision-making

Long Term (18 months–5 years)

• BNG becomes “business as usual”

• integration into broader nature-related regulation

• potential expansion into:

  • supply chains

  • sector-wide standards

🧠 The Bigger Picture: A Test Case for Nature-Positive Policy

BNG is more than a domestic policy—it is a test case for how nature can be integrated into economic systems.

Its success will depend on:

• regulatory clarity

• market functionality

• institutional capability

But also on something less tangible:

the willingness of businesses and investors to treat nature as a core strategic consideration

🔑 Conclusion

Biodiversity Net Gain represents a bold and necessary step in aligning development with environmental recovery.

Its challenges—cost, complexity, capacity—are real and must be addressed. But they are also typical of any systemic transition.

The opportunity lies in moving beyond:

• compliance

• short-term cost considerations

towards:

• strategic integration

• long-term value creation

• and the development of a functioning nature economy

If implemented effectively, BNG could position the UK not just as an early mover, but as a global leader in nature-positive growth.

The question now is not whether BNG will shape the future of development—it is:

how effectively we adapt to it, and how fully we realise its potential.