In my house, which has drywalls, some are foil lined for insulation I get around 10m before it stops working.
How far you get totally depends on whats between the devices. In our house our cooker has a giant, metal panel on the wall for splash guarding. PRoblem is this totally stops all wireless signals. We have metal lined drywalls as well. We also have brick. It can go 10m on the same floor but cant seem to do from one floor to the next (wood).
Also depends on the way your devices are sitting as to how the signal beams around. Signal antenna tend to work in a donut sort of shape.
But read the marketing material and they will always quote you the maximum range when unobstructed.
