Final answer:
The point at which lumber becomes a fixture is when it is permanently attached or affixed to a property, such as a house. This determination depends on how the lumber is used and attached to the property.
Step-by-step explanation:
The point at which lumber becomes a fixture is when it is permanently attached or affixed to a property, such as a house. Fixtures are items that were originally movable but have become attached to land or buildings in such a way that they are considered part of the property.
For example, if the lumber is used to build a deck that is bolted or secured to the house, it would likely be considered a fixture. On the other hand, if the lumber is simply stacked on the property but not attached to any structures, it would still be considered personal property.
Ultimately, the determination of whether lumber becomes a fixture depends on how it is used and attached to the property.