Power down, drain water and remove as much as practical, unhook electric, move spa to a location where it's out of the way of any construction, keep it covered.
Unless it's subject to freezing temperatures or sitting open in the hot sun, there isn't much to worry about. Set it down on a surface that will support it adequately.
I'd take a shop vac to the jets to get as much water out of the plumbing as possible, so it doesn't sit and get stagnant.
When you power back up, fill up just like you did when the spa was new.