Natural Capital and Biodiversity Investing: BNG Credits, Ecosystem Services, and Nature Finance

Natural capital — the land, water, soil, air, and biodiversity that underpin all economic activity — has long been unpriced by markets. Regulatory changes, net-zero commitments, and the growing recognition that ecosystem collapse poses systemic economic risk have begun to change this. The UK's Biodiversity Net Gain (BNG) requirement, mandatory since February 2024 for most new developments, has created a new statutory market for biodiversity credits. Combined with voluntary carbon markets and emerging payments for ecosystem services, natural capital is transitioning from environmental accounting to investable asset class. This guide explains the landscape clearly.

Biodiversity Net Gain: The Regulatory Driver

The Environment Act 2021 introduced a mandatory Biodiversity Net Gain requirement for developments in England. Since 12 February 2024, all new planning applications (above minimum thresholds) must demonstrate that the development will leave biodiversity at least 10% better off than the pre-development baseline — measured using the DEFRA Biodiversity Metric 4.0.

The BNG requirement creates a three-tier compliance structure:

1. On-site mitigation: The developer provides biodiversity enhancements within the development boundary — planted areas, green roofs, sustainable drainage. Preferred in the planning hierarchy.
2. Off-site mitigation: Where on-site provision is insufficient, the developer must purchase BNG units from a habitat bank — land specifically managed to enhance biodiversity and registered with a Local Planning Authority (LPA) or the national credit register.
3. Statutory biodiversity credits: If neither on-site nor off-site mitigation is available, developers may purchase statutory credits from Natural England at fixed prices — currently set deliberately high to incentivise the use of habitat banks rather than government credits.

BNG unit pricing (off-site habitat bank units) is currently ranging from approximately £20,000–£65,000 per unit depending on habitat type, quality, and location, as of early 2026. Prices have been rising as demand from development (mandated) meets restricted supply from established habitat banks.

How Habitat Banking Works

A habitat bank is a defined parcel of land (typically agricultural land being restored to a higher ecological condition — woodland, wetland, upland bog, chalk grassland) that is enhanced, monitored, and maintained under a long-term legal agreement.

The investment structure typically involves:

1. Land acquisition or long-term lease: The habitat bank operator acquires or enters a lease on agricultural or degraded land, typically for 30+ years (the minimum management commitment required by DEFRA for BNG credit sales).
2. Habitat enhancement: Removing intensive farming inputs, reintroducing native species, creating water features, establishing woodland corridors.
3. Metric assessment and registration: A qualified ecologist applies the DEFRA metric to score the baseline and projected biodiversity uplift; the bank is registered with the relevant LPA or national register.
4. Credit sale: As development projects require off-site BNG, they purchase units from the habitat bank at agreed prices.
5. Ongoing management and monitoring: Annual reports to the LPA confirming biodiversity outcomes are maintained.

The operator's return depends on: land acquisition cost, habitat restoration costs, credit pricing achieved, timing of credit sales, and long-term management cost.

Early operators include Wilder Carbon, Environment Bank Ltd, and Natural Capital Research. Institutional capital (from Gresham House, Schroders, and dedicated natural capital funds) has begun to enter the market.

Nutrient Neutrality Credits

Separate from BNG, nutrient neutrality is required in certain catchments where water quality standards are not met. Developments in affected areas (identified by Natural England) must demonstrate that they will not add to the net nutrient load (principally nitrogen and phosphorus) entering sensitive waterways.

Nutrient neutrality credits are generated by taking land out of intensive agricultural production (which reduces fertiliser runoff) or through constructed wetlands or agricultural process changes. These credits are sold to developers who cannot demonstrate on-site neutrality.

Nutrient neutrality is a smaller market than BNG but has been active since 2023 in affected catchments (primarily Southern and Eastern England). Credit prices vary considerably by catchment — from approximately £2,000 to £15,000 per kilogram of nitrogen equivalent depending on scarcity.

Voluntary Carbon Markets (Nature-Based Solutions)

Alongside the statutory BNG and nutrient markets, UK woodlands and peatlands generate voluntary carbon credits under the Woodland Carbon Code (WCC) and Peatland Code (PC) — DEFRA-endorsed standards for verifying carbon sequestration in UK nature-based projects.

Woodland Carbon Units (WCUs): Generated by new UK woodland creation certified under the WCC. Typically sell to large corporates seeking UK-sourced carbon offsets for scope 1–3 emissions. Current prices range from approximately £20–£45 per tonne of CO₂e (as at 2025/26), driven by corporate net-zero demand.

Peatland credits: Peatlands are the UK's most carbon-dense ecosystem when in healthy condition. Degraded peatland is a significant net emitter; restoration sequesters carbon. The Peatland Code provides a framework for certification and credit sales.

Forestry investment has been a traditional HNW alternative — the combination of timber revenues (modest) with carbon income, Woodland Carbon Guarantee scheme payments (government floor price purchase), and inheritance tax reliefs (commercial woodland may qualify for Business Property Relief or, where farmed, Agricultural Property Relief) has attracted significant interest. Note that from 6 April 2026 the 100% rate of APR and BPR is capped at £2.5 million of combined qualifying assets per estate (per person) — originally announced at £1 million in the October 2024 Budget and raised to £2.5 million in December 2025, transferable between spouses and civil partners — with relief above that ceiling reduced to 50% — materially changing the IHT calculus for larger landholdings. Prices for UK commercial forestry land have risen materially over the past decade.

The Emerging Ecosystem Services Payment Landscape

Beyond BNG and carbon, the UK government's Environmental Land Management (ELM) schemes create payment streams for land managers who deliver public goods from their land:

Sustainable Farming Incentive (SFI): Payments for sustainable farming practices. Countryside Stewardship Plus: Targeted payments for high-value ecological management. Landscape Recovery: Larger-scale, longer-term grants for transformative nature restoration projects.

ELM payments are not investment returns in the conventional sense — they are public subsidies — but they form part of the income stack for natural capital land management strategies, reducing the dependency on BNG credit sales alone.

Investment Structures for Natural Capital

Direct land ownership: The most direct approach — purchase agricultural land and transition it to a natural capital management strategy. Agricultural Property Relief may be available for land that continues to be actively farmed, and Business Property Relief may apply depending on the activity. Note that from 6 April 2026 the 100% rate of both reliefs is capped at £2.5 million of combined qualifying assets per estate (per person) — raised from the originally announced £1 million in December 2025, and transferable between spouses and civil partners — with relief above that level reduced to 50%; the eligibility of land managed purely as a habitat bank (rather than farmed) for these reliefs is itself uncertain. Take specialist tax advice.

Natural capital funds: Closed-ended AIFs managed by specialist natural capital fund managers (Gresham House, Osmosis, Lombard Odier Natural Capital, Foresight). These funds acquire and manage diversified natural capital land portfolios, selling BNG, carbon, and nutrient credits to corporate buyers. Minimum commitments typically £250,000–£1 million.

Listed infrastructure investment companies: Some listed investment trusts have begun incorporating natural capital within broader environmental infrastructure mandates.

Listed equities: Direct, pure-play listed exposure to the BNG market remains very limited. Most leading habitat-bank operators — such as Environment Bank Ltd (privately held, backed by Gresham House) — are not publicly traded, so listed access is generally indirect, via diversified environmental or natural-capital infrastructure vehicles rather than dedicated BNG equities.

Risks and Challenges

Natural capital is an early-stage investment market with material structural uncertainty:

• Policy risk: BNG requirements, ELM payment rates, and voluntary carbon market standards are all subject to government policy decisions. A change in government or policy direction could materially affect credit pricing.
• Market liquidity: The BNG credit market is young and illiquid. There is no exchange; pricing is bilateral and opaque.
• Verification and permanence: Biodiversity and carbon outcomes must be maintained over 30+ years. Land management failure, invasive species, or climate change impacts could undermine the biodiversity values sold.
• Greenwashing risk: Regulatory scrutiny of corporate claims about nature offsets is increasing. If corporates reduce their use of voluntary credits due to greenwashing concerns, demand may not meet projected levels.
• Planning and regulatory delays: Habitat bank registration and LPA approval processes can be slow and uncertain.

How Global Investments Can Help

At Global Investments, we are monitoring the natural capital market carefully as it transitions from regulatory obligation to asset class. For clients with interests in UK land — either as existing agricultural landowners or as prospective investors — we can help you understand how BNG, carbon credits, nutrient neutrality, and ELM payments interact with your existing tax position (particularly IHT agricultural property relief) and overall portfolio strategy. We can introduce specialist natural capital fund managers and land agents who are building track records in this emerging space, and we will be transparent about what remains uncertain in a market that is moving quickly but still finding its form.

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Natural capital investments carry significant policy, liquidity, and market risk. Returns are not guaranteed and values can fall. Tax treatment depends on individual circumstances and legislation, which may change. This guide is for information only and does not constitute regulated investment advice. Seek professional advice before making any investment decision.