I was sure

that the line
Walls were made for knocking down
had been written (perhaps by Moses)
and was well-known,

but on consulting Messrs. Google
I found entries only along the lines of

Design advice for knocking down internal walls. In order to comply with fire regulations, the new structural support will need to be boxed in, which will typically result in a drop of 200mm-250mm in ceiling height. This is why you often see....blablablabla