”The first step in installing pot lights is in remodelling of the ceiling. In old buildings, there is a need to make several adjustments to the ceiling to create an open joist where the wiring installations will go through. Then the joist is covered with the new ceiling material.
In cases where there is space above the ceiling, there is no need for remodelling needs.”
I found this on the web, and this is very outdated. With the innovation of LED pot light the fixture is now more adaptable, they can be placed anywhere as long as they're IC (insulation contact) rated. So remodelling should have to be an option to have your pot lights Installed.