Title page

Contents

Background 2

The BNG process and metric 5

Challenges for securing future gains 13

References 23

Contributors 31

Table 1. Biodiversity net gain metric principles 6

Table 2. Biodiversity metric rules 7

Table 3. BNG Mitigation Hierarchy 10

Table 4. Trading rules for compensating for losses 11

Table 5. Suggested strategic approaches to delivering net gains 18

Table 6. Key challenges for biodiversity net gain implementation 20

Figure 1. Expected timeline of BNG implementation. BNG applied to major developments from February 2024 and then extended to other developments from... 4

Figure 2. The baseline survey pre-intervention score calculation 7

Figure 3. Newly created habitat post-intervention calculation 9