Justine started her sustainability career at the Energy Saving Trust, managing a variety of grant programmes on behalf of UK central government. She also led the delivery of the Pay As You Save pilots; one of the early projects testing innovative new approaches to financing home retrofit projects through the savings made on bills.
Following this she worked on a variety of projects developing new approaches to retrofit. All with the same goal of trying to find new business models to support the challenge of upgrading the existing UK housing stock for a net zero future.