A piece of trim it is only a small space but I would like to see what the istall looks like . I honestly hardly ever follow all the rules about expansion joints when doing laminate is that what your floor is?

Yes it will be laminate. I haven't started the install yet and will need to order the trim when I order the flooring if I decide to go that route.

photos of the fireplace please

What is expandable grout?

Uptown Floors solution or attach "T" molding to the floor and floor will go under it. Do NOT use any type of caulk it will look unfinished plus how does he or she plan on capturing the floor? Base molding also holds the floor down.