What are grounds for dismissal?

No. Although the law gives construction employers a great deal of leeway in deciding whether to fire an employee, there are limits.
No. Although the law gives construction employers a great deal of leeway in deciding whether to fire an employee, there are limits. This means you can fire these employees for reasons unrelated to their job performance. For example, you can fire them if you don't like them.
If the employee has an employment contract or if you have made promises to the employee, then that contract or those promises will control when you can fire the employee. In most cases with an employment contract or where you made promises, you can only fire the employee for something called "good cause".