I'm with Irving on this, whilst you have chance fit some insulation, it will pay for itself over and over again. You can get some powdered adhesive used for sticking plasterboard to walls, cheap and it stick like shìt to the proverbial blanket.

Also second the floor tiles, I got some from Amazon a while ago and put some on the floor boards in the workshop. That's the boards that sit on a concrete floor in front of the bench, like duck boards but in my case just solid 25mm MDF to make it easier in your feet. Lasted a week before they had chips trod in and were starting to break up.