Choosing an incorrect size of mini storage unit is one of the costliest errors homeowners can make.
Too small and you’ll run out of room for your stuff… Too big and you’re wasting money each month on unused space. The best part? Selecting the right sized mini storage unit is easier than you imagine.
Let’s jump in!
What you’ll discover:
- Why Mini Storage Unit Size Matters
- The Most Popular Mini Storage Unit Sizes Explained
- How To Pick The Right Size For Your Home
- Common Mistakes Homeowners Make
Why Mini Storage Unit Size Matters
Self storage is exploding in popularity right now.
Actually, 1 out of every 3 Americans rent a storage unit. That’s a lot of people! And it’s no wonder – between escalating housing costs, downsizing to smaller spaces, and just the general way clutter accumulates… the average homeowner needs some extra space.
But here’s the kicker…
Most homeowners have no idea what size to choose. They guess. They underestimate what they have. And they choose the wrong size unit. That’s why before you decide, you need a real mini storage unit size guide homeowners can count on. If you’re searching for mini storage for extra items, the size you pick will make or break your experience.
Here’s why size matters:
- Cost: You pay for square footage, not what’s inside.
- Access: Cramming a unit full means you can’t reach anything at the back.
- Protection: Items packed too tightly can scratch, dent, or break.
- Flexibility: Leave room to add more later… because it always happens.
Size your storage correctly and storage stress disappears. Size it incorrectly and you’ll worry about storage every month.
The Most Popular Mini Storage Unit Sizes Explained
Storage units typically only come in a few different sizes. Here are your options.
5×5 Storage Unit (25 sq ft)
This is the smallest size of mini storage. It’s basically a walk in closet.
A 5×5 unit is perfect for:
- Seasonal clothing and decorations
- Boxes of books, paperwork, or photos
- Small furniture and sporting goods
If you want a place to store a few boxes from the attic or some Christmas decorations, this is your ideal choice. It is also the most inexpensive option.
5×10 Storage Unit (50 sq ft)
Twice the square footage of a 5×5 — and also one of the most requested sizes by homeowners.
A 5×10 can comfortably fit everything you might store in a small bedroom. There’s room for a mattress, a dresser, and some boxes with space to spare! Ideal for studio apartments, bedroom furniture sets, or big appliances.
10×10 Storage Unit (100 sq ft)
10x10s are the most common unit size at nearly every storage facility. No surprises there.
It holds about the same amount of stuff that would fit in a small bedroom. Typically this will include everything in a 1-2 bedroom apartment: furniture, appliances, and 30-40 moving boxes. If you aren’t sure which size to order, a 10×10 will work just about every time.
10×15 and 10×20 Storage Units
Now we’re getting into the “big” category.
A 10×15 unit will fit everything from a 2-3 bedroom home. The 10×20 unit is about the size of a normal one car garage and will hold an entire 3-4 bedroom home. These sizes work best for house moves or major renovations.
How To Pick The Right Size For Your Home
Now to the important bit… How do you actually pick the right size?
Don’t worry, it’s simpler than you think.
Make A Full Inventory
Before you start moving boxes around, walk through your house and make a list. List everything you own that you want to store. Everything.
Sounds boring, but it is the most critical step. Many people seriously underestimate how much they own. When you have your list, you’ll begin to get a better idea how much room you will require.
Group Items By Size
Now group your inventory into 3x categories:
- Big stuff — furniture, appliances, mattresses
- Medium stuff — boxes, bins, smaller furniture
- Small stuff — decorations, clothing, miscellaneous
This helps you visualize how much actual floor space you’ll need.
Add Some Breathing Room
Here’s a pro tip most homeowners miss…
Rent a unit that’s a little bigger than you think you’ll need. Keep 10-20% of the space unfilled for reaching things in the back, adding stuff later, and rearranging.
Unit cramming will save you money initially, but drive you crazy over time.
Consider Your Budget
The good news? Average self storage prices fell 24% from 2023 levels meaning storage prices are more affordable than ever. 5×5 spaces may only be $40-60/month. 10×20 spaces could cost you $200+. Choose the smallest size that fits all your belongings.
Common Mistakes Homeowners Make
Want to avoid the most common mini storage mistakes? Here are the big ones.
Renting Too Small
This is the #1 mistake by far.
Customers see the price and choose the lowest they think they can “get away with.” Then arrive with an U-Haul trailer full of items that exceed their selected plan. Then they are forced to pay for another unit OR upgrade (move everything twice).
Lesson: When in doubt, go one size up.
Forgetting About Height
Mini storage rooms are usually 8 feet tall. How much unused vertical space do you have!?
Stack boxes vertically. Keep lighter boxes on top of heavier boxes. Maximizing your vertical space may allow you to rent a smaller (less expensive) unit.
Skipping Climate Control
When storing anything sensitive…wood furniture, electronics, paintings, pictures, important papers…you ABSOLUTELY NEED a climate controlled unit. The extra cost is worth it.
But replacing damaged items costs WAY more than the extra few dollars a month.
Not Planning Access
How often will you need to get into your unit?
If you are storing items you will need access to frequently, organize it as you would a short term storage unit. Keep the things you will need most in front and maintain a clear aisle through your unit.
Final Thoughts
Choosing the perfect size mini storage unit really is simple. Here’s a quick review:
- Make a full inventory of everything you plan to store
- Group items by size and visualize the space you need
- Pick a unit slightly bigger than you think (leave 10-20% empty)
- Don’t forget to use vertical space
- Get climate control for anything sensitive
The 10×10 is the most popular unit for a reason — it works for the majority of homeowners. However, you have unique needs, so take this as a general guide. When you find the perfect size for you, mini storage is one of the simplest ways to declutter your home and keep your belongings safe.
Images courtesy of unsplash.com, pexels.com and freepix.com
