There is no legal definition of what constitutes a “material consideration” but some of the most common material planning considerations include, in no particular order:
National planning policies.
Proposed local development plan policies and supplementary guidance (i.e., those which have been approved by the Council for consultation purposes or as interim guidance, but have not become part of the adopted local development plan).
Appearance and design (e.g. materials, height, scale, massing, density and layout).