Box Moor Trust, founded over 400 years ago to look after the land and properties of the Boxmoor Estate in Hemel Hempstead, are leading the project.
When complete the bespoke two-storey green oak frame, pinned together with dowels, will be clad in timber. Inside will be space for school and adult learning groups, community visits and accommodation for staff and volunteers.
It is over ten years since the original barn that housed the Box Moor Trust burnt down. The group has worked with architects, planners and conservation officers to produce a design that fits in well with the landscape and heritage.
"This summer work began on the replacement building that will provide much needed additional space for the work of the trust," said a spokeswoman. "A number of different styles of truss represent the history of oak frame construction."
Carpenter Oak and Woodland designed and is building the property, with a log boiler providing heat and hot water using fuel from the trust’s woodlands. Insulation will be made of wood fibre when completed next year by main contractor GS Walker and project manager Brasier Freeth.