A fixture is something fixed. In Transfer of Property Act, a fixture is a chattel which is affixed to the soil or land. But a chattel by merely being affixed to the land will not become an immovable property. There are two things which has to be considered for arriving at the point whether a chattel is an immovable property. This can be called the doctrine of fixtures.
(1) Mode of annexation
If the chattel remains on the land by its own weight and is not affixed to the land there is a presumption that it is only a movable property. Here the criteria is the intention to make whether it a fixture or not. If the intention was to make it part of the land it is treated as a fixture.
If the chattel is fixed to the land by means of nails or such things the presumption is that it is a fixture and become an immovable property.
(2) The Purpose for Annexing
The tenure of beneficial enjoyment of the land is a necessary criterion to hold whether the chattel is an immovable property.
If the purpose of annexation is the permanent beneficial enjoyment of the land the presumption is that it is a fixture.