Mobilization and demobilization costs can vary greatly depending on the type of work being performed and what level of costs and logistics will be required to get the job rolling. So, there isn't really one rule of thumb to follow on all projects.
But, mobilization should represent the actual costs of accumulating and coordinating all the necessary equipment, tools, materials, etc. - it shouldn't typically be made up independently and without a sound basis. With that being said, mobilization costs tend to be under 10% and even as low as 2%. And as mentioned above, that should be pretty tightly tied to the actual costs of mobilizing and demobilizing the job.
For more background on mobilization in general: Construction Mobilization | How to Manage Mobilization Costs.
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