Depending on how extensive a renovation, budget and location, the following may be on my list.Starting the plan to renovate an old tractor shed into a new heated garage
50'x28'
Shed was built in 1958
Dirt floor presently
Steel siding is showing its age. Going to strip it all off, insulate etc.
What features should I plan for?
Accessory dwelling unit above
Storage loft above
Beam for sliding hoist (or chainfall)
Mini-split for most heat (cheap to operate and bonus of a/c, also can use two or more heads so Adu and shop are serviced by one exterior unit) probably gas fired heat for fast temp changes or emergency heat.
Two and four posts lifts both come in handy
If you plan on doing much welding/grinding a separate area (can be welding curtains if they are high). The amount of crap that comes off those activities is incredible.
A system to ventilate quickly and easily if you fill it with smoke/fumes (normally need something high as garage doors only ventilate the bottom well
Separate compartment for air compressor and dust collector (probably external shed attached to wall)
I may come up with more later.