The three-storey, 12,000 m2 sandstone building is the central hub of the Lauriston Place campus.
The refurbishment will take place in two phases between June 2016 and December 2018.
Kier’s work will include stripping out asbestos, re-slating all roofs, and putting in double glazing, insulation and new lighting.
The project will also deliver improved facilities for the school, which is part of the University Of Edinburgh.
Got a story? Email news@theconstructionindex.co.uk
