Double materiality
biodiversity and real estate
The CSRD requires simultaneous assessment of the company's impact on biodiversity and biodiversity's impact on the company. For real estate, this dual perspective reveals concrete financial risks and value creation levers.
The double materiality principle
Unlike previous reporting frameworks (NFRD, optional GRI), the CSRD imposes a dual-entry approach. The company must assess:
- Inside-out Impact materiality — how my activity affects biodiversity. Which ecosystems are degraded, which species disturbed, which ecological corridors disrupted by my operations.
- Outside-in Financial materiality — how biodiversity affects my economic viability. Which financial risks arise from dependency on ecosystem services, and which opportunities emerge from preserved biodiversity.
ESRS 1 (general requirements) specifies that an issue is material if it is material on at least one of the two axes. For biodiversity in real estate, both axes are almost systematically material: construction affects biodiversity (impact), and biodiversity degradation affects asset viability (financial risk).
Impact materiality: what real estate does to biodiversity
Real estate is one of the sectors whose direct impact on biodiversity is most documented. The main pressures identified by ESRS E4 and the IPBES framework:
Land take
The leading direct cause of biodiversity loss in France. Each property development converts natural or agricultural land into sealed surfaces. The Climate and Resilience Act (ZAN) aims to halve the rate of land take by 2031 and achieve net zero land take by 2050.
Habitat fragmentation
Buildings and roads create physical barriers that interrupt ecological corridors (green, blue and dark ecological networks). The BPS Design Phase specifically evaluates the maintenance or restoration of these networks.
Light and noise pollution
Night lighting and noise disturbance disrupt biological cycles (migration, reproduction, feeding). The BPS "dark ecological network" criteria measure how these pressures are addressed in the design.
Introduction of invasive species
Landscaping can introduce invasive plant species that degrade local ecosystems. The choice of planting palettes is a BPS criterion.
For each property development, the BPS quantifies these impacts through its 75+ criteria (Baseline Assessment and Design). The results directly feed the E4-4 datapoints (impact indicators) required by the CSRD.
Financial materiality: what biodiversity does to real estate
This is the less intuitive axis, but often the most decisive for finance directors and investors. Biodiversity degradation generates concrete financial risks for property assets:
| Risk | Mechanism | Financial impact |
|---|---|---|
| Heat island | Loss of green cover → summer overheating | Increased service charges (air conditioning), reduced attractiveness, depreciation |
| Flooding | Sealing → loss of soil absorption capacity | Material damage, increased insurance premiums, uninsurability |
| Regulation | ZAN, directive 2024/825, Natura 2000, water legislation | Planning permission blocked, sanctions, litigation |
| Reputation | Unverified biodiversity claim | Greenwashing post-2024/825, reputational damage, client loss |
| Market | Assets without biodiversity data excluded from SFDR 8/9 funds | Reduced investor pool, discount on disposal |
These risks are no longer hypothetical. Listed REITs publishing under CSRD since 2025 are finding that ESG analysts and institutional investors demand biodiversity data per asset, not consolidated corporate-level statements.
The BPS produces the dependency indicators expected by E4-5 and the data needed for the EU Taxonomy biodiversity DNSH analysis. Asset-level scoring enables REITs to consolidate at portfolio level while retaining the individual granularity required by auditors.
Conducting the double materiality biodiversity analysis
EFRAG recommends a structured three-step approach to conducting the double materiality analysis on biodiversity. The BPS fits naturally into this process:
Issue identification
Map the pressures exerted (impacts) and the ecosystem services consumed (dependencies) for each asset or development. The BPS Baseline Assessment phase produces this mapping.
Materiality assessment
Quantify the severity of impacts (gravity, scope, irreversibility) and the magnitude of financial risks (probability, magnitude). The quantified BPS scoring enables this quantification on a reproducible scale.
Prioritisation and reporting
Rank material issues, define which datapoints to publish, structure the E4-1 transition plan. BPS results provide the factual basis for this strategic step.
Independence of the assessment
Frequently asked questions
The double materiality analysis is mandatory. If it concludes that biodiversity is material (which is almost systematically the case in real estate), full ESRS E4 reporting becomes required. Failing to conduct the analysis exposes the company to non-compliance risk.
The analysis is the responsibility of the company, typically led by the CSR team with support from specialist consultants. The BPS provides quantitative impact data that feeds the impact materiality component. The financial assessment requires a risk and opportunity analysis.
The TNFD (Taskforce on Nature-related Financial Disclosures) framework and CSRD double materiality converge. The TNFD LEAP approach (Locate, Evaluate, Assess, Prepare) structures the dependency and impact analysis that directly feeds both components of ESRS E4 double materiality.
Climate double materiality: the same exercise for ESRS E1
The double materiality analysis is not limited to biodiversity (E4). ESRS E1 (climate) requires the same exercise: assessing the company's impacts on the climate (GHG emissions, including construction site emissions) and the risks that climate change poses for the company (physical and transition risks).
For the construction site climate impact component, Efficarbone provides the primary data. ESRS E1 and construction carbon →
Double materiality: biodiversity and climate
BPS for biodiversity impacts (E4), Efficarbone for construction site climate impacts (E1). Structure your double materiality analysis across both components.