To reach the targets fixed on sustainability - economic, energy, environmental - it is necessary to intervene with special attention on the historical heritage that is characterised by low energy-environmental quality. It implies complex retrofit interventions with relevant economic-financial impacts. Considering the international regulatory framework on sustainability, accompanying the energy policies, theoretical and methodological orientations are extrapolated, in order to support historical buildings retrofit and restoration. The paper focuses on the criticalities (and the potentialities) deriving from economic (cost) constraints, performance requirements and assumptions of conservation. Differently reactive to such issues, English and Italian contexts are compared.
Keywords: Economic sustainability; energy policies; refurbishment of historical heritage