It is wise to assume that you will need planning permission for your project...
This way it will ensure you do your due diligence and engaged with the appropriate regulatory bodies.
As the saying goes, "It's better to be safe than sorry" as the last thing you want to find out is that you are in breach of your local planning regulations and being ordered to demolish your creation!
As a general rule, shipping containers do not need planning permission if they are being used as is.
However if you are changing the use of a shipping container it is important that you make the required checks with your local planning office as there may be things you need to consider such as:
Conditions on area
Don't forget building regulationS
It is important to ensure your project conforms to Building Regulations and the appropriate approval has been gained as in worst cases prosecution can follow from offending work that has been carried out.