'are permitted to' is correct and usable in written English. You can use it when you need to indicate that something is allowed. For example: Employees are permitted to take up to two weeks of vacation each year.
Some, however, are permitted to travel alone.
Competitors are permitted to make certain modifications in their cubes.
But it's not just students who are permitted to fail.
Once admitted, they are permitted to earn more.
Law enforcement agents are permitted to ask for information.
And yes, Richard and Piers, you are permitted to enter.
Only Indians are permitted to rice on the lake.
But dogs are permitted to love unrequited and to excess.
Only American citizens are permitted to vote in elections.
In most states, gay singles are permitted to adopt.
In some cases, hygienists are permitted to work without supervision.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK