It’s just going to depend on the exact materials in the walls and how much rain you get.
Zwave plus extends the unobstructed range of zwave devices, but if you have a metal barn and a brick house, the signal will never get through. If it rains a lot, that’s a separate problem. If the two devices are each by a clear glass window, that helps a lot.
If you’re using the older zwave devices, 40 feet through two walls is pushing it. But it will be fine once you get signal into the first device inside the house, after that it’s just the distance between devices. The advantage of mesh: devices relay messages to each other.
Try this topic, it has more info:
Also. If you haven’t already, read the range and repeaters FAQ: