Absolutely it's not acceptable to work in a building zone. That must contravene a number of Health & Safety rules. The dust generated can't be good for you, for a start.
I was in the same situation a good few years ago ... the open area opposite my workspace was being enclosed and divided up into "cells" and there was hammering and drilling going on all day. At one point my Departmental Director came stomping out of his office and complained about all the noise and that he was having to shut his door. I replied very sweetly that he was very lucky to have a door to shut
A little later I had to cross this open "building site" to get something from one of the offices and missed by a hair's breadth (I literally felt the breeze of its passing!) being hit on the head by a metal strut - the type used to finish off the corners in cellular offices. After that I declared that I wasn't going in there anymore and they finally put up a taped barrier declaring it off limits. It was a very dangerous situation that the management had allowed to continue until they realised that someone might get hurt.
It's very bad that no-one's bothered to tell you about this or to relocate you temporarily.
Poor you
