What should be the standard Roof height?

The ceiling height of residential buildings is generally 3 m. However, the minimum height requirements as per the National Building Code are as follows

You can find more about it in this link below:

https://theconstructor.org/building/rooms-minimum-height-size-standards/5116/

The ceiling height of public and industrial buildings are larger than residential buildings, due to various reasons like the people traffic, ventilation purposes and for easy operation in case of industries.

The minimum height of public buildings and industrial buildings is 3.6m.

Generally, Residential bldgs are given 10ft roof height. If the false ceiling is provided, then the height is from 10.5 – 11ft.

For commercial bldg, it is 10 – 12ft.

For residential building standard size of roof height is given as 10 feet. And for commercial building it is given as 10 to 12 feet.