Designed to recognise and celebrate buildings in Scotland that boast low carbon and sustainable design principals, the Carbon Trust Scotland Low Carbon Building Awards feature two categories - new build and refurbished.
The two winning entries were The Big Shed in Aberfeldy, in the new build category, an eco-community centre submitted by ea ecological architecture, and the Scottish National Portrait Gallery in Edinburgh in the refurbished category, submitted by Page \ Park Architects.
In addition to the two winners from each category, the Noreen and Kenneth Murray Library at the University of Edinburgh was highly commended in the new build category, submitted by Austin-Smith:Lord.
Low Carbon Building Award winners - Scottish National Portrait Gallery
Low Carbon Building Award highly commended - University of Edinburgh
Paul Wedgwood, General Manager, Carbon Trust Scotland, said: "Our two winning buildings and highly commended finalist not only embody low carbon design principles, but also deliver reduced energy demand and emissions, sustainability and a high quality of occupant experience.
"Once again, the judging panel was greatly impressed with the effort and energy efficient processes that had been put in place across all the 2013 entries. All the entries showed great innovation and demonstrated their commitment to creating a low carbon environment for the occupants.
"However, The Big Shed, the Scottish National Portrait Gallery and the Noreen and Kenneth Murray Library all displayed fantastic results that should be held up as exemplary case studies of best practice to show how a building can become more energy efficient, benefitting both the environment and the organisations' bottom line."
John Glenday, editor of Urban Realm, added: "Sustainability as a word trips off the tongue with ready ease but in practice it can be a far more nebulous term to quantify. The Low Carbon Building Awards are the perfect prism through which to view these concepts by drawing together the best exemplars Scotland has to offer.
"In life as in architecture true beauty isn't façade deep; it reaches down into the guts of schemes such as The Big Shed and Scottish Natural Portrait Gallery; both of which have embraced sustainable principles early on in the design process to enormous effect.
"A low key community hall in Perthshire and a nationally significant institution in the heart of the capital couldn't be further apart in terms of budget, function and setting but what they share is a unifying embrace of low carbon principles as the foundation of successful design."