They already have the ceramic tiles. The room is 12x12 . I wonder what the installation cost could be? For the labor?

I think it can vary by location and contractor. I would call around and get an idea from those that do this type of work. Estimates.

A lot also depends on what the floor is now. Is it wood or concrete or what? Thinset and grouting must also be considered. I agree with talaniman, just call and get at least 3 estimates.

Thanks so much. Floor has a level and firm surface. Linoleum is on it now.

Linoleum? Vinyl? On slab or wood? On wood needs a backer board. Even vinyl probably heeds a skim coat. Too much flex and the grout will fail.