Building and Contents insurance can be split into two separate insurance policies.
However, you can also group the two under one umbrella, which is also known as Home Insurance.

Building insurance covers the main structures of the property or home.
For example, this is everything from your walls, windows and roof to all the permanent fittings and fixtures, such as baths and toilets.

Therefore Contents insurance covers all the possessions in your home. Once you combine buildings and contents, it covers both.