Help- Is our builder a cowboy?

[Golaz]

He’s currently installing a new bathroom for us. Hasn’t got far yet, but the floor tiles have been laid. (No grouting added yet), and we noticed that the floor is slightly convex in the middle. Should he have checked this and flattened it out before tiling? How concerned should we be about this?

@Golaz I know this situation is tough. But only you know how the job is really going, and what you will settle for and how much it will cost you.
It could be that everything works but some things look shonky.
Make the choice that you can be happy with. Good luck. :)