Can the expression "living space" be used as a synonym for "square footage" when talking about the size of a house?
Sometimes, not always. If you're stating in numbers the size of the space, you would have to say something like:
- The house has a thousand square feet of living space.
But you can use it as a word-for-word substitute if no numbers are involved.
- It has plenty of living space / It has plenty of square footage.
I'm not a teacher. I speak American English. I've tutored writing at the University of Southern Maine and have done a good deal of copy editing and writing, occasionally for publication.