At the initial survey, I offer advice regarding relevant issues, such as:
Council Planning Policy, Boundaries, Foundations, Drainage, Structure, Roof design, Stairs, Fire, Insulation, Damp, Build costs, Internal layout options, etc...
If it becomes apparent during the initial survey that your requirements may not be feasible, I will explain why and offer alternatives if relevant.
By not charging until after my paper work / Plans are approved by the authorities, I can't risk 'not' being thorough because any detrimental issues not highlighted during my survey are likely to come to your attention when my paperwork is sent to the authorities, before I'm paid.
I'm NOT able to allow clients to wrongly assume plans will pass when I know they conflict with Council policy.  I have to be honest.  I can't just say nothing or mislead, just to get paid for drawing plans.