Running one flooring material continuously through a kitchen-diner-living space, rather than switching material at each old room boundary, is one of the simplest ways to make an open-plan extension feel like a single cohesive space rather than three rooms with the walls removed.
Large-format porcelain tile is a popular choice for exactly this reason — durable, works with underfloor heating, and available in finishes that mimic timber or stone convincingly enough for most people not to notice the difference.
Where a softer material is wanted in a living area, a clearly defined rug over a hard floor gives you the zoning benefit without breaking the continuous floor visually.
