There are several ways to charge for project management time:
- As a percentage: Which ranges from 10% to 15% of the total cost of the project.
- On an hourly basis: The more the project manager does, the more you charge. The client needs to be aware of this first.
The most common form though is to charge hourly but to ensure that the project management hours charged are between 10% to 15% of the total cost.
Note: Some companies don't even list project management in their invoices, but they implicitly include it in the total cost.