Ecological Impact Assessments are usually presented as Ecology Chapters within a wider reaching Environmental Statement, although they can also be stand alone reports.  The need for an Ecological Impact Assessment will be agreed with the Local Planning Authority after the Preliminary Ecological Appraisal has been conducted.

Ecological Impact Assessments aim to quantify the effects of a scheme on the baseline ecological conditions. Effects can be both beneficial and adverse. Many schemes have beneficial effects on ecology one the mitigation and enhancement strategies have been taken into account and this can promote planning permission.