I have a single sectional garage and over time fitted interlocking floor tiles (ebay), moisture resistant chipboard to walls, kingspan to ceiling, insulated roll to doors, stanley units with rubber checker plate matting on top and ali checker backing plates.
I had 5 strip lights fitted and changed the tubes to LED ones which are a lot brighter
De-humidifier keeps damp out and warms inside up
This was over a couple of years and now it's bright/ clean/ warmer
Starting out
Insulation behind chipboard on walls
Insulation on door
stanley units + walls fitted with chipboard and painted
Worktop with rubber matting (easy to clean)
