The 1,200sq m split-level garden shop has been rebuilt from the old Evans Halshaw workshop buildings that closed on the site in 2008. Green features include solar panels, LED fittings and grey water recycling.
The new roof is 300mm thick with airtight seals to retain heat. The building also features triple-glazed barrel vault lights.
An airlock system has been designed by environmental architects Ecotecture of Haywards Heath to minimise heat loss through a series of lobbies at the entrance and exits.
The glazing is Argon-filled and the automatic door system has been sourced from Assa Abloy of Sweden to ensure optimum heat retention within the building.
The floor has been overlaid with 300mm of insulation laid between joists mounted on specially designed insulated saddle pads to minimise heat loss.
Managing director Jonathan Tate said several 27,000-litre tanks are under the new plant sales area. The offices are super-insulated with natural lighting provided by Monodraught mirrored sunpipes extending to the roof. Ventilation is provided via a heat recovery system fitted above the insulated ceilings.