Civil Works while a Hospital is fully functioning

Any upgrading or maintenance work on a functioning hospital should not inconvenience the ongoing service. I have been to some well known medical device manufacturing facilities in Europe, where I have seen such expansion work without compromising very strict European regulations on Biomedical Device manufacture. It is true that it is expensive. But eminently worth it.
This report describes how a running hospital handled it in US:
https://azremagazine.com/news/construction/hospital-construction-zone

What happens in most hospitals in India is better left unsaid.