First, architecture is a matter of views
When you consider the project to organize a simple room, often a single point of view is enough to decide which organization to settle and how to organize. Then, anybody is able to tackle the problem.
When you consider the project to design a full flat, you need to collect and concile the points of views of all people at stake : you, next occupant if you sell it, others sharing the same building, housekeeper, people in charge of maintenance, and so on…
It won’t be only a matter of connecting all requirements, which is not often simple, you ‘ll also need to prove that your design give a response to each of them.
This is the Enterprise Architecture deal.