Every little thing in the project should be in writing, even down to the door stops :-) See my tile spec sheet below ...Two problems with your post though - 1) In my experience, most problems come from the customer changing their minds constantly.

Since bathrooms are relatively small, using some unique tiles and fixtures won’t break the bank and will go a long way with buyers.3.

🏡 Hello, would love to hear from you, just bought a property and starting demo to do a fix/flip, but I'm really not good with choosing tiles, fixture and colors, can you help me?

When planning a home renovation, it's easy to focus on the excitement of picking out tiles, colors, and layouts—but there’s a lot happening behind the walls and floors that often gets overlooked. 

Lots of investors simply want to go "bold" on all of their projects by using sharp color contrasts, busy tiles that catch your attention, and modern lighting that looks like it belongs in a hotel.

Since you are not doing super high end finishes as mentioned, doing high end flooring and all other stuff just above builder grade does not warrant tile or full wood flooring. 

Using the appropriate amount of lights and mirrors is a pretty low-cost way to really make the space feel custom.Unique tile installation patterns such as vertical stacked or herringbone.

I'm sure some policies have all kinds of language in them, but if it guarantees me full replacement that is what I would expect otherwise my granite counters would be replaced with laminate and my tile and hardwood replaced with vinyl and the cheapest carpet.

The tile in the bathroom looks great.

A great contractor takes pride in their work, whether it’s making sure tiles are perfectly aligned or that the trim looks just right.4.