A Heritage Statement, also called a Heritage Impact Assessment, is a document designed to outline the impact of specific design proposals on a listed building, whether that be physical impact with extensions or internal alterations, or aesthetic impact from new buildings in the curtilage of the building. The core of the assessment rests on historical research and a statement of significance, which is informed by the research carried out and an assessment of the built fabric; in all cases, this will be in proportion to the complexity of the proposals and the general significance of the asset.
In accordance with the policies set out in the National Planning Policy Framework (NPPF), Local Authorities might require these assessments to be submitted with listed building consent applications in order that the proposal might be decided with a full understanding of the impact of the proposals at hand. However, owing to the research element, they can also provide illuminating historical facts and connections of local, regional or national significance and as a basis for further research. For buildings of high profile or significance, Local Authorities may require a Historic Building Appraisal as well as this assessment.