Bankside Open Spaces Trust is moving into a green building which is to be its centre for community gardening, volunteering and parks work.
The distinctive timber curved structure is fully insulated with sheep's wool. Its designer Phil Clayton described it as a "woolly jumper". He called the building "high-tech and not just a shed".
"It's an eco building. It's sustainable. It has a green roof you can see and we are going to call it a 'business is green unit'."
"This building has had a difficult birth," said BOST chair Tim Wood standing outside the new office. "But we got through," he added before thanking many organisations and individuals including "amazing neighbours".
"We are really delighted to be moving into our new base of operations," said BOST director Helen Firminger.
"It gives a visual demonstration of BOST's commitment to good design and environmental standards in tandem and will allow us to build even better relations with our local community."
The EcoHouse was designed by Philip Clayden working with his team at SolidArt, Oxford Brookes University's Institute of Sustainable Development, architects White Adamski and engineers Rodrigues Associates.