The Green Mark Scheme is intended to promote sustainability in the built environment and raise environmental awareness among developers, designers and builders when they start project conceptualisation and design, as well as during construction.
It encourages developers and owners to build and maintain greener buildings and requires the achievement of a 28% energy efficiency improvement from 2005 building codes for new and existing buildings undergoing major retrofitting works (with a gross floor area of 2,000 m2 or more). (source: Climate Action Tracker)
The Green Mark Scheme has been enhanced in 2015 "to raise the sustainability bar for buildings" (source: https://www.eco-business.com/news/singapores-new-green-mark-scheme-a-game-changer/).