Is this a Contractor Red Flag?

[Adam Gonzalez]

Happy Friday Everyone!

So I have a quick question. I am in the process of renovating a property and interviewing contractors. One contractor I spoke with provided a quote of $16,000 to renovate two bathrooms (1 small and 1 medium sized). This quote is for labor and materials. I was asking for the cost of labor and they indicated they do not separate the two. They also indicated that they only use their vendors for materials. This is not such a big deal but I would at least like the option to use Lowe's for example if I am not in love with the company they use or is too expensive and want to go another option.  I just want a breakdown of what I am paying in labor and see what they are charging for materials. They were firm that they do not show the cost for labor and that they only use their vendors. Is this a red flag or common? Look for an outside perspective. Thanks guys and hope you are all kicking a$$. 

- Adam