I prefer to see the tile removed. The more flexible (aka "thin") vinyl products (less than 8mm thick) have a tendency to telegraph subfloor abnormalities. You can float anything you want over top the tile...just be prepared to have MAJOR disappointment in the visual look OR move to a very thick, rigid, high-end vinyl product to get this to work. As I've always said (as my previous incarnation as Cancork), it is always better to remove old tile. Start fresh = a fresh start.

Yeah I think it should flow very well. Is this the sort of style that you were thinking? (I searched "modern farmhouse") The brown looks pretty similar to this luxury vinyl tile "hillborn hickory" I actually installed a project 2-3 weeks ago that used the "weatherwood" color from that same flooring collection, paired with the "white stone" which was used in entry + bathrooms. Kinda similar to what you were envisioning.

The only other seamless flooring I know of is Forbo's Marmoleum. However, it may not withstand your rollator or puppy claws. Sheet vinyl can be susceptible to damage, too, but at least it's cheaper and easier to maintain. I agree with Hallett & Co that if you're laying sheet vinyl over slab it won't be much softer than any other flooring. We've had a couple of houses in FL with vinyl over slab in some rooms (such as the laundry) and it was no easier on the joints than our tile floors. One product I'm familiar with that can help is Dricore subfloor. While the top layer is OSB, since you plan to use a sheet vinyl you shouldn't have to worry about liquids getting through to damage it. While you didn't ask, I hope that your architect and builder can find a way to provide access to that ADU without the need for steps. My husband and I are in our 60s, and I've had to use a wheelchair for extended periods over the past two decades, so our new house will have no steps front or back. Wide (min. 36") doors and halls, plus a 5' turning radius in several rooms, were requirements for our home so it's ready for whatever happens later.

We are replacing laminate in the kitchen and are looking at Nextfloor Luxury Vinyl Plank or Tile. We prefer a light grey stone look to go with our new counters. We cannot find independent reviews and would appreciate help from this community. Thanks!