7When a decision is made on a planning application, only certain issues are taken into account; these are often referred to as ‘material planning considerations’.
Planning Aid have published a paper on what is a material consideration and what is a non material consideration. Read here
From this paper:
The weight attached to material considerations in reaching a decision is a matter of judgement for the decision-taker however the decision-taker is required to demonstrate that in reaching that decision that they have considered all relevant matters.
Generally greater weight is attached to issues raised which are supported by evidence rather than solely by assertion.