If your friends or colleagues have been recently promoted, here’s an easy template you can use to write a congratulations letter for their promotion.
I am writing to extend my congratulations for your recent promotion to [indicate new position].
I know that you’ll be successful in your new role because you are a hardworking and dedicated employee. You are one of those highly valued employees that greatly contribute to the success of [company] and spearhead projects in our industry. Know that you are respected and appreciated here.