Reputation and Reviews: Seek for organizations who have received good comments and commendations from their past clients. A good reputation is in most of the cases a sign of good work done and satisfied customers.
Portfolio and Experience: Check their portfolio to be able to see what kind of projects they have completed for other companies. This way you will get to learn more about how they write, and the kind of focus area they have. In the same regard, it is also worthy to determine the period that the particular company has been operating.
Licensing and Insurance: Check to confirm that the painting company is accredited to practice its business in the region through a valid license. This shields you from any potential risk in case there are accidents or damages while executing the project.