It all depends on the scope of service that both parties agreed to.

For example, when we are hired to produce an IT evaluation or process improvement, etc... we will get the report done in an unbiased way.

At the end of the engagement, if there is a second phase or implementation, we will automatically produce a proposal. The assumption is the client will likely ask for other proposals and we can be in the mix.

So depending on the scope of the work, I would assume that the contracted firm expects they would need to earn future work.

But you want to be open and fair with them. If they have not done it, you may want to suggest they provide a proposal as well.