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The BIG Biodiversity Challenge is now closed. 

 Enter BIG Biodiversity Challenge and join the movement to protect and enhance biodiversity in the built environment.

Enter the 2021 Awards


1. Choose the relevant award categories relating to your biodiversity enhancements.


2. Complete the Submission Form.

3. Return the submission forms to at CIRIA. The submission deadline is Noon 21 June 2021. A shortlist will be announced in late summer following the judging process due to be completed in July 2021.


The BIG Biodiversity Challenge Award ceremony

The winners will be announced at the #BIGAwards ceremony in September 2021. Details will be announced in due course.


Sponsorship opportunities:

Take a look at our sponsorship page. There are a number of award categories that requires your support along with some bespoke packages.  Become an award sponsor


Join the conversation: Follow us on Twitter: @BIGbiodiversity and LinkedIn: CIRIA and use the hashtags: #DoOneThing, #Biodiversity, #BIGChallenge & #BIGAwards.

Categories and guidelines:


Please refer to the 2021 Award categories page for more information about this year's awards. Please note:


  • There are 8 award categories this year and each enhancement can be entered into two categories. 

  • Judges will select an overall winner for the enhancement that demonstrates an outstanding commitment to biodiversity.

  • The awards are free to enter.

  • In order to be eligible for the BIG Biodiversity Challenge 2021, your project must have been completed in the 24 months up to and including 10 June 2021. For eligibility criteria please refer to judging guidelines below. 

  • Download the awards judging guidelines. 

  • For the Biodiversity Legacy Award the programme should have been in place for at least 12 months up to and including 10 June 2021. 


Key dates:

  • 21 June 2021   - BIG Biodiversity Challenge 2021 closes for entries. 

  • 19 July 2021 - Awards shortlist announced following Judging days. 

  • Date TBC September 2021 - BIG Biodiversity Challenge Awards ceremony.

Organisations taking 2021  Challenge 


Further information:

If you would like more information about the 2021 BIG Biodiversity Challenge and Awards please email CIRIA

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