The Best Way to Choose Your Storage Unit Size (2025)

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Oct 22, 2025

I can’t tell you how many times I’ve seen it. Someone shows up with a 20-foot truck absolutely packed, eyes full of hope, only to find out the 5×5 unit they rented online is about the size of a bathroom. The panic on their face is real. And as the guy who runs Downtown Mini Storage, I hate seeing it.

Choosing a storage unit size is weirdly hard. You’re trying to picture all your 3D stuff fitting into an empty 3D space you’ve never seen. It’s like a bad geometry test. Get it wrong, and you either pay for air or you play a crushing game of storage Jenga.

Let me walk you through this, not like a textbook, but like the guy who’s been in hundreds of these units and has seen what actually fits.

The “Wait, That’s All?” Sizes

  • The 5×5 Unit: Think of the smallest bedroom in your house. Now imagine it’s even smaller. This is your “I need to clear out the garage” special. It will happily swallow your Christmas decorations, a dozen plastic bins of kid’s clothes, your golf clubs, and a bunch of boxes. It will NOT swallow your sofa. I don’t care how clever you think you are at folding it. Just trust me on this.
  • The 5×10 Unit: Now we’re talking. This is like a decent-sized walk-in closet. This is the sweet spot for someone moving out of a studio or one-bedroom apartment. You can get a queen mattress, a couch, a TV stand, a few boxes, and your microwave in here. You can even fit a motorcycle and have room to walk around it. This is, hands down, one of our most popular sizes because it’s just so darn useful.

The “Oh, This is Actually Spacious” Sizes

  • The 10×10 Unit: Okay, this is a real room. This is a bedroom. You can fit the contents of a two-bedroom apartment or a small house in here. We’re talking multiple dressers, a kitchen table, a fridge, a washer and dryer, and all your boxes. The best part? You can actually create a pathway down the middle. This is key if you think you might need to get to that one box at the back in six months without having a meltdown.
  • The 10×15 Unit: This is a big bedroom. This is for the family that’s moving, renovating, or just has a lot of… life. Three bedrooms of furniture? No problem. It also starts to become a realistic option if you want to store a car and still have a bunch of room for other stuff.

The “Are You Storing an Airplane?” Sizes

  • The 10×20 and bigger: This is a one-car garage. This is for when you have a vehicle and a household of stuff. It’s for business inventory, or for storing everything from a very, very large home. When people roll up with a massive moving truck, this is usually where we point them.

Here’s My Best Advice (And It’s Free)

Don’t Guess. Pile. Go into your room and physically make a pile of everything you want to store. I’m serious. You will forget half your stuff if you just try to mentally list it. Seeing it all in one heap is terrifying, but it’s the best way to know what you’re dealing with.

Think Up. The ceiling is your best friend. Take the legs off your table. Take the feet off your couch. Break down that bed frame. Stack those boxes to the sky (well, to the 8-foot ceiling). You’d be amazed at how much space you waste by not disassembling one big thing.

Be Real About Access. This is the big one. Are you just dumping stuff for a year? Or will you need your ski boots in December? If you need to get to your things, you MUST leave yourself an aisle. That might mean going one size up. The extra twenty bucks a month is cheaper than therapy after you’ve had to unload the entire unit to find your tax documents.

And here’s my final, no-kidding offer. After you’ve made your pile, call me. Tell me what you’ve got. “John, I’ve got a king bed, a huge sectional, a dining room table, and like, 40 boxes.” I hear this all day long. I can literally picture it in my head and tell you which unit will make your life easiest.

Final Thought

That’s what we do at Downtown Mini Storage. We’re not just a place to dump your stuff. We’re your partners in not losing your mind during a move. Come see the difference a human conversation can make.

Hope this helps. Really.

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