The Hornbeam is hired by community groups who share in its vision. A range of groups use the Centre as a base and a place for meetings and events, including:

• Organiclea Community Growers
• Common Sense Growers
• Waltham Forest Cycling Campaign
• Transition Walthamstow
• Friends of the Earth Waltham Forest
• a local reading group
• a drumming group
• a knitting circle
• Open Spaces & Nature Conservation Forum
• the New Lammas Lands Defence Committee
• Lea Bridge Conservation Volunteers
• Transition Community in Waltham Forest
• WF LETS (Local Exchange Trading System)
• The Drive Coop.

The Hornbeam Centre also has close links with Forest Recycling Project and the HEET Project