re: What do you wish you would have built into your shop?

An I beam run strategically across a section of the shop with a trolley for winch/chain falls

Air piped to multiple locations with drip legs

220 50 amp plugs by the overhead doors

a 2 ton mini split locate where it's easy to get to access the screen filter

large roll around work tables with locking casters make sure they are right height so they can serve as outfeed tables for your woodworking projects.

get an echo show 8 3rd gen, great for streaming music and you can ask it any mathematical or fractional computation and you'll never need the iphone carpentry app

Commercial ice machine & beer fridge

Definitely.

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A word of caution OR advice. Build whatever size electrical service you think you may need BUT call it storage space on permit application and install one GFCI outlet and one switched light fixture. When you get an occupancy permit and the inspector is finished load that bastard down with lights and outlets and all manner of shite. If you wire it like you want it ahead of time the inspector is liable to come up with all manner of shite that ain't necessary. I have done this with shops that had 800 amp services in them....and never had an inspector ask why. They know why.

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Amite county, Mississippi. Zero permits and zero inspections required.

Regret not putting a bi-fold door on both ends. Have a 30’x18’ bi-fold door on porch end but put a 25’x18’ insulated garage type door on the back. Damn thing is nothing but trouble because it is so heavy. Bi-fold door has had zero problems.

Most people will tell you to double the size, as if that is something you forgot to do LOL. I have had a shop at 5 different houses in the last 35 years. One was 4000 SQ feet with another 800 SQ feet of office and bathroom space. This was the office and shop that served as my business shop and I had a couple of employees there most days and more often than not on Saturdays. It was also my "hobby" shop. It was pretty close to perfect for my needs at the time. I had one in New Mexico that was a commercial building, in my backyard, and it was 8000 sq feet with 2 18X18 roll up doors, a 1500 square foot mezzanine which I converted to an ADU and office and it had a 800 amp, 3 phase, 277/480 volt service. The entire building was climate controlled. This was my "hobby" shop. It was WAAAAAYYYYYYYY too big for what I used it for. At the time I had a pretty basic commercial custom cabinet shop and associated tools and equipment. That space would have been ideal had I been running a custom cabinet shop commercially with several employees. I was not. I was using it to store 2 boats, an RV, and a shite load of tools and equipment. It was still cavernous....I tried everything I could do to fill it up with more tools and machines and equipment....and made a game effort at it....but the work flow, for what I did in it, was severely impacted by the sheer scale of everything in it. We bought that house because of that shop but it was, for an individual, simply too big. I pushed carts from one end to the other constantly. I have found that somewhere in the neighborhood of 1000 square feet, for a shop only, is ideal for what I do in a shop. Not storage but just my shop. I am currently in 484 sq feet....22X22. That is too small BUT it is more efficient than tha 8000 sq foot monster was. Bigger is not always better...it can lead to massive inefficiencies in work flow and, if you're a junkie, a massive amount of tools, machines and equipment you probably do not need.

I have 3 shop buildings, all for different purposes.

Some interesting ideas, but I've never needed or wanted a bathroom in any of my shops. If I need to piss, I walk outside and piss. But I live in the middle of the country.