The AFM has no guidelines for the costs of an average mortgage advice. If you pay the financial advisor directly for his services, the advisor may not charge unreasonably high costs for the advice. The 'manifest unreasonableness standard' applies to this, which a financial adviser must adhere to. This means that the costs must be in proportion to the consultant's efforts. Incidentally, you must decide for yourself whether you consider the consultancy costs for the service to be reasonable.
The amount of the consultancy costs depends on your personal situation and the number of hours that an adviser works for you. You may also be able to prepare work yourself, which in turn saves time for the consultant and costs.