BTCV will officially open its new £1.8m environmentally friendly headquarters this week.
Sedum House in Doncaster is made from recycled materials and features low-energy heating and lighting. The roof is covered with sedum, a shrub that absorbs water and insulates.
"It gives us a better image," said Martin Hall, head of procurement at BTCV. "We have improved training facilities and, because it's an open-plan office, staff communication is more efficient."
Rooms will be let to offset building costs.