There is an option to upgrade the size of the warehouse on the computer. I've only done the first one but it makes a huge difference. If you have done all of the upgrades and have somehow filled up all of the space you are hoarding rather than trying to run a functioning business I think :p

I used the Max department store option I can't expand it anymore

Yes, there should be an option to increase it even more

i don't think we need a bigger warehouse but for the orders too match what we have so we can sell it i get next to no orders for premium stuff and most of my shelfs are both premium and rare. Order's Need To Be Fixed BAD!

I execute the orders but something is always missing

One more extention of warehouse needed.

Yes

Either allow the expansion the warehouse two more times, or upgrade the shelves to hold more. Seems to be a lot of empty space on flat-pak furniture, lumber, and windows that could be better used. Could get 2 medium windows or 4 small in the space of one large window.

We need a larger warehouse