Over floor, yes (sometimes), but not over the walls. This requires removal of the existing walls, then new wall material, cement backer board, etc. then tile - a full job. And be sure to pick a pro. I got a call to look at a 4 yr old (new) shower that was part of a new addition. They said a couple tiles (wall mosaic) were a bit loose, and it was leaking into the basement. When I removed the tile, silicone patch and scratched out the grout, I could see the corner wall studs an inch wide! Not a good install, but shows what some guys will do to save time and materials.

Thank you for your help. Here are the after pictures excluding decorative accents. Wall paint BM Palladian Blue, floor tile 12"x3" grey marble polished porcelain, accent wall tile 24"x12" white marble polished porcelain with white marble stone pencil border.

It sounds like all tile is rather typical for your area based on another comment. Here where I live, much more North if you, it is not only unusual to have tile everywhere but seems “cold” in appearance (though may actually be warm with in floor heat!). But when I travel to warmer and more humid climates tile everywhere looks and feels perfectly normal. So it really is all market and area dependent. A different tile in bath would be fine as long as you are not going with another wood look tile. It is a master ensuite so “just” for you and in my opinion it is fine if it is totally different than rest of house. I’d either do the wood tile in bedroom or do carpet. Just depends on personal preference as some people (this includes me) likes carpet in bedrooms for coziness, warmth, sound dampening but again...I am in a very different climate than you. I would not do wood next to wood look tile.

I heard back from Schluter. Here's my question and their answer: Question: Can the uncoupling membrane be installed directly over existing ceramic tile? This is a basement - the tile is installed over the concrete subfloor. Tile is in good shape - just ugly. We don't want to remove it. So if the membrane can be installed over top, what type of thinset should we use to bond the membrane to the existing tile? Answer: If the following requirements are met, we expect this type of installation to be successful. However, given the wide range of potential existing conditions, this application is not covered by a specific detail in the Schluter-DITRA Installation Handbook and is therefore not covered under warranty. In principle, DITRA can be installed over existing tile. In general, the following minimum requirements must be met for a successful installation. The substructure must be adequate, per the DITRA Installation Handbook (e.g., joist spacing, plywood thickness, etc). The existing tile must be well bonded; any loose tile must be removed. The tile must be cleaned before the DITRA installation to remove any bond breakers. The DITRA can be installed in a similar fashion to what is called out in detail D-V-T in the DITRA Installation Handbook. (I looked this up, and it's referring to installing over vinyl.) Option 1. Use a rapid-setting modified thin-set mortar suitable for bonding to existing tile to install the DITRA Option 2. Skim coat the tile with a modified thin-set mortar or suitable cement-based embossing leveler, allow it to dry, and install the DITRA with unmodified thin-set mortar For further details please see attached Ditra installation Handbook