Cracking in grout after one week of bathroom renovation…

Pictures would help. Its likely not a big deal at all, almost definitely no need for a re do certainly. Yes you can re grout over grout thats not an issue, grout is basically just a filler.

Grout should be used conservatively along borders of things like tubs, sinks, etc. that dont flex and then that area should be caulked as caulk has flex for better waterproofing.

You can also scrape/ cut out grout and reapply in areas.

If in BTR, I’ve used a grout caulk.

When posting on this board, it helps to add your location and add pictures to help with solving the problems.

Thanks for the input ; trying to post photos now. It’s cracking mainly in the middle of the floor. Edges near tub, toilet and sink are mainly intact. They did have to replace the sub floor

Something wrong there. Mixed it wrong or something. I put the same tile on a backsplash recently. Tell myself every time I'll never do it again. This is much worse than what I did though.

What kind of flooring was there before? When they replaced the subfloor did they use a cement backer board? If not what did they install?

Some of the installers I’ve seen will mix the grout very thin which makes it easier for them to spread. They water it down which can cause cracking like yours. Cement finishers will do the same with concrete, watering it down so it’s easy on them. Gotta watch everyone and everything they do.

Epoxy Grout