If they are crooked and that means he did not level or space them when he put them on. You could ask. But either he will refuse or walk away.
YES!
If the work that’s being done is not pleasing to you, you should definitely let the contractor know. Most of the time they will remedy the problem because they don’t want any negative reviews.
If the lines are really crooked, I would bring it up before he does the grout. It’s easier to demo now then it will be after its grouted. He’s also more likely to work with you on fixing it before he finishes, then after.
Grout joints should be consistent - that is why you use spacers. I have set a lot of tile and if joints are inconsistent then it will always be noticeable. Although sometimes that is the style of the tile material.
Good luck.
If tile doesn’t lay properly on the wall, then more than likely what was done before the tile was set is not correct. Most contractors will use hardy back to prepare shower walls but technically showers should be floated with cement in order to achieve a proper finish. This means the walls will be exactly level and there will be no seams which could effect the integrity of the shower over tile.
For sure. Catch it now before grout is set.
Your money, your bathroom, yes!
If you have just noticed this before completion, ‘YES’ it should be addressed. Imagine grouting and having to correct the issue later. That could be a huge time taken and put the relationship between you and your contractor in the rough. Although some tile and textures vary, and some tile, although from same box are not perfect, this is something that a contractor would mention before installing especially if he did not purchase them.
Yes, any work performed should be up to your standards.