The complexity is in the junctions
In an apparently simple room, every joint, skirting line and material transition is visible. Agree samples, thicknesses, tolerances and junction drawings before ordering. Check how concealed panels open and services are maintained: inaccessible equipment can undermine the cleanest interior.
Test samples in the apartment
The same stone changes near a window and under evening light. Compare materials together on site, not in isolated photos. Then define site inspection points and how defects are corrected: ‘quiet’ should mean precision in execution, not a lack of detail in the drawings.
Show the finished junction before the finish begins
Request a full-size sample: wall-to-floor junction, stone meeting timber or a concealed door. It exposes colour, thickness and alignment problems that a rendering may hide. Record which sample is approved, who checks execution and when the next stage can begin. Confirm access to filters, valves and equipment: routine maintenance should not require removing an expensive finish.