does this mean to translate to "the size has been increased"?
No, I'm afraid not. Still, I can't think of a context for this sentence.
perhaps construction. or a hairdresser, even.
This is a very vague sentence--hard to translate, because meaning is so fuzzy. Something like "The size is also a factor, perhaps." But without context, it's guessing-time.
The term "height" as alternative solution is incorrect here.
I'm being recommended to understand this as "Maybe the size has to be considered too." in a context "He's good at playing basketball because of his skill. Maybe his size/height adds to his good play."