Biodiversity and sustainable real estate news
Official Journal of February 22, 2026: all official definitions of nature in the city (renaturation, CBS, TVB, brown network, micro-forest). Complete strategic analysis.
This publication:
- cancels and replaces that of December 16, 1998
- establishes the reference administrative definitions
- harmonises French and foreign equivalents
- is mandatory for government departments
Nature in the city is becoming part of administrative law.
Quick summary - Key points to remember
- The terms become normative.
- They structure urban planning documents.
- They can be used in litigation.
- They do not define any measurement method.
- They clarify the language, not the performance.
And yet, that's where everything is decided.
Official definitions 2026 – Extractable format
Renaturation - official definition
Definition: actions aimed at restoring or recreating an ecosystem favorable to biodiversity.
Administrative implication: legally binding term in a public file. Limitation: no defined ecological threshold.
Revegetation - difference with renaturation
Definition: restoration of vegetation cover.
Difference: Revegetation is an action. Renaturation is a global ecological process.
Biotope area coefficient (BAC)
Definition: proportion of areas favorable to biodiversity, weighted according to their nature.
Implication: may be a condition for planning permission. Limitation: does not measure actual ecological functionality.
Eco-friendly surface
Definition: surface capable of supporting a diversity of species.
Implication: design tool. Limitation: not a performance indicator.
Green network
Definition: network of terrestrial biological corridors.
Blue weave
Definition: network of interconnected aquatic environments.
Green and Blue Infrastructure (TVB)
Definition: set formed by the green network and the blue network.
Requirement: must be mapped in planning documents.
Implication: mapping creates traceability.
Brown weave
Definition: a network formed of soils that promote the development and movement of species.
Strategic concept: introduces the soil dimension into ecological continuity.
Pattern of silence (white pattern)
Definition: a network of sites where noise pollution is greatly limited.
Emerging concept: integrating acoustics into biodiversity.
urban microforest
Definition: small urban wooded area with a high density of diverse tree species.
Replaces “tiny forest”.
Urban forest
Definition: wooded area in an urban area intended for recreation.
Urban heat island (UHI)
Definition: an urban space that is warmer than its surroundings.
Urban Cool Island (UCI)
Definition: urban space designed to reduce temperature.
Soil loosening
Definition: de-sealing and restructuring of surface layers.
Difference: more structuring than a simple disbursement.
Rain tree
Definition: a tree planted in a pit to promote water retention and infiltration.
Link: stormwater management.
Agriurbanism
Definition: urban planning based on the maintenance or development of agricultural activities.
Amenities
Definition: natural characteristics and services contributing to the quality of the living environment.
Strategic dashboard - What these terms actually measure
| Term | Introduced an obligation? | Introduced a measure? | Introduced a performance? |
| Renaturation | Yes (official use) | No | No |
| CBS | Yes (urban planning) | Yes (proportion) | No |
| TVB | Yes (mapping) | Spatialization | No |
| Microforest | No | No | No |
| Brown weave | No | No | No |
Conclusion: The lexical framework is structured. Ecological performance remains methodological.
The question remains open.
Legal implications
A term defined in the Official Journal becomes subject to interpretation in litigation.
Examples:
- A “renaturation” can be challenged if it does not correspond to the official definition.
- A mapped TVB can be audited.
- A CBS can be verified quantitatively.
Vocabulary becomes subject to opposition.
1998 → 2026: Doctrinal evolution
In 1998, nature in the city was descriptive.
In 2026:
- It is mapped
- it is integrated into urban planning documents
- It is linked to authorizations
- it introduces a logic of traceability
Lexical standardization always precedes the requirement for proof.
Dominant long tail FAQ
What is the official definition of renaturation in 2026?
Defined in the Official Journal of 22 February 2026 as a set of actions aimed at restoring or recreating an ecosystem favorable to biodiversity.
What is the difference between renaturation and revegetation?
Revegetation is a specific action. Renaturation is a global process.
Does the biotope coefficient measure biodiversity?
No. It measures a proportion of weighted areas.
Is the green and blue network mandatory?
It must be mapped in the planning documents.
Strategic Conclusion
The vocabulary is now stable.
Nature in the city is entering a structured administrative phase.
The words are set.
The measure is not.
Environmental credibility will depend on the ability to transform: a definition into an indicator, an indicator into verifiable proof.