Measure the route, not just the final room
Sauna panels may be wider and taller than expected even when shipped flat. Measure doors, stair width, landings, handrails, ceiling pinch points, and the turning radius into the room. Compare with carton dimensions when available.
Control moisture before assembly
Do not use the sauna to solve a damp-basement problem. Address leaks, condensation, and relative humidity first. Leave room to inspect the base and walls, and dry the cabin after use with the door and vents open as directed.
Check cold-slab and ceiling effects
A level concrete or tile floor is generally convenient, but a cold basement can extend warm-up. Ceiling height must accommodate the assembled cabin plus any clearance needed to lift or place the roof panel.
Sources and documentation
Specifications, claims, and installation requirements can change. Confirm the current manufacturer manual for the exact model and variant.