If your contractor has done a great job and you would like to thank them, here is a sample letter of commendation for a contractor.
[Name of contractor]
Dear, [Name of contractor]
We would like to express our sincere gratitude for your services. Your efforts are deeply appreciated by us and the company has profited greatly with your help.
Your work with us has been commendable and we applaud your hard work and dedication towards making our vision a reality.
Thanking you again.