I would have some counter space if it is possible - nice to have a "landing zone" for things one takes off the shelves or when arranging shelves.

An electrical outlet if you want a 2nd fridge.

I would also aim for a small counter area. I find it's very useful for unloading groceries to have an area in which to set the bags, which you don't have with shelving alone.

I am seconding what @Angel 18432 said about an outlet in the pantry, except I use mine for the MW that I keep in the pantry. So great to get the MW out of the way! We are not frequent users of the MW, and keeping it in the pantry was the best idea--learned on this forum (if you use the MW a lot, then pantry location is probably not for you). Which leads me to my next point, shelf depth. I have shallower shelves in my pantry from about chest height on up, so that I don't have to dig past things too much to find or see anything. I have deeper shelves from about the waist-down, to hold the aforementioned MW, my big LC pots, roaster pans, picnic lemonade jug dispenser (the kind with the spout on the bottom), and other large things. In other words, all the large kitchen things that I have no idea where I'd put them otherwise.

In my L-shaped pantry, I have 12" deep lower shelves on one wall, 16" deep lower shelves on the other wall, counters over both of these, and 12" deep upper shelves over both sides. There's the usual 18" between the counters and the lowest upper shelf so there's space for the breadmaker, blender, etc.

Anne

Multiple depth shelves - based on items you wish to store ( think canned goods vs crock pots ) . Definitely a couple of outlets. Definitely some counter space. Also , if you need it, space allocated for mops or brooms or the vacuum cleaner if there isn't another place for those items.

Think also about your garage and how much space for storage you will have there as well so you know for example, can you keep that huge package of paper towels from Costco in the garage and just two rolls in the pantry or do you need to keep Gigantor in the pantry?

(Maybe while space planning your pantry you also want to plan for storage in the garage, too.)

Don't know about you, but I'm not getting any younger, and things aren't getting any lighter.

Please keep a dedicated space for a cart on wheels. Maybe a two or three tier cart. Find the cart you want and get the measurements and plan the space to fit the cart.

Because pretty soon you won't want to be carrying back and forth those heavy, heavy duty expensive kitchen appliances.

And since no one is perfect, not even you, why worry that someone is going to drop and dent your grandmother's huge tray?

Also plan a dedicated space for a step ladder.

Or a real ladder if your kitchen has cabinets that go way up.

If you do a fair bit of entertaining and you like the frills and furbelows, consider planning a space where the table linens can be stored either rolled up or hung.

If you have a fair bit of silver consider drawers/cabinets that have decent locks.

Adjustable shelves. The most efficient shelving has items of similar height on the same shelf, so there isn't wasted space between the items stored and the shelf above it.

https://www.houzz.com/discussions/2401919/pantry-photos-pics-of-pantries