Sep 17, 2026 · 13 min · 9 segments
There is a change to biodiversity net gain that came into effect on 6 August 2026 and that a great many small developers have not registered, because it arrived quietly in amendment regulations rather…
So the core rule is this.
For any planning application made on or after August 6, 2026, development sites that are 0.2 hectares or less.
Which is what, about 2,000 square meters?
Exactly.
2,000 square meters or less.
Those sites are completely exempt from mandatory BNG.
Wow, just completely exempt.
Yes.
There is one major caveat about priority habitat that we will definitely get to, but fundamentally 0.2 is the magic number.
Okay, so let's make this real for you listening.
If your site comes in under that 2,000 square meter mark, what are you actually escaping? Because BNG is not just some quick web form you fill out.
Far from it.
Falling below that threshold means a massive regulatory apparatus just disappears.
You don't need to run the statutory biodiversity metric.
Which is incredibly complicated on its own.
It's a
nightmare of a spreadsheet.
Yeah.
And you don't need a biodiversity game plan.
You don't have to prove a 10 percent ecological uplift.
Right.
You don't have to go buy expensive offsite units from a habitat bank.
And the biggest one, you escape the 30-year habitat management and monitoring liability.
DEFRA actually expects this to remove BNG requirements from about half of all residential planning permissions.
Wait, half? Half of all residential permissions just drop out of the system?
So the core rule is this.
For any planning application made on or after August 6, 2026, development sites that are 0.2 hectares or less.
Which is what, about 2,000 square meters?
Exactly.
2,000 square meters or less.
Those sites are completely exempt from mandatory BNG.
Wow, just completely exempt.
Yes.
There is one major caveat about priority habitat that we will definitely get to, but fundamentally 0.2 is the magic number.
Okay, so let's make this real for you listening.
If your site comes in under that 2,000 square meter mark, what are you actually escaping? Because BNG is not just some quick web form you fill out.
Far from it.
Falling below that threshold means a massive regulatory apparatus just disappears.
You don't need to run the statutory biodiversity metric.
Which is incredibly complicated on its own.
It's a
nightmare of a spreadsheet.
Yeah.
And you don't need a biodiversity game plan.
You don't have to prove a 10 percent ecological uplift.
Right.
You don't have to go buy expensive offsite units from a habitat bank.
And the biggest one, you escape the 30-year habitat management and monitoring liability.
DEFRA actually expects this to remove BNG requirements from about half of all residential planning permissions.
Wait, half? Half of all residential permissions just drop out of the system?
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