This briefing paper will help readers understand the levels of environmental performance that can be achieved in heritage buildings – i.e. listed buildings and buildings in conservations areas. For these types of building there can be several inherent restrictions which limit the potential improvements that can be delivered. This paper provides an overview to planners, owners and aspirational designer on ways to achieve challenging BREEAM targets for such projects. In addition, BREEAM assessors and Accredited Professionals can use this information in providing appropriate advice to their clients when seeking BREEAM ratings in heritage buildings.