An older Banjara Hills house already holds craft you cannot buy again today. The work is reading which elements to keep.
When you renovate an older independent house, keep what cannot be bought again at today's craft and cost: solid teak doors, hand-laid stone floors...
Some elements in an older house represent craft and material that are either unavailable now or ruinously expensive to reproduce.
The opposite of the keep list is the systems list. These are the parts of an older house that have aged out invisibly, behind the walls.
The third lens is the one owners forget. An older house is not only a set of things to keep or refresh; it is missing things that did not exist when it was built.