Housing or indeed architecture in general are continually altered. There are a variety of reasons to preserve or modify some of its parts but they always obey specific needs of its users at a certain moment in their lives.
And that new project will always involve, to a greater or lesser degree, a new type of adaptation.
Maybe you need to enlarge a room for a new office.
Maybe now that you spend more time at home you want to build a new addition and use it as a gym.
Maybe you want to join two small rooms and create a bigger space.
Maybe you want to enlarge your family room...
The possibilities are endless ...