What Size Self Storage Unit Do I Need?

Choosing the right size storage unit can be confusing. And what happens if you do the research and pick a unit, only to discover a closet full of things you forgot to account for? Find answers below to the most commonly asked questions about making sure you have the right sized storage unit for your self storage needs.


How much self storage space do I need?

The amount of storage space you need depends on what you are storing. Generally speaking, we recommend 50 square feet of storage for every room of furniture.
Check out this Self Storage Calculator for reference or chat with one of our storage experts. They would be happy to help you determine what size storage unit will best fit your needs. For those with Alexa-enabled devices, enable the StorageMart skill and simply say "Hey Alexa, ask StorageMart what size unit I need."

Can I change sizes later?

Yes, you can upsize or downsize a unit if you discover that you need more or less space. You can also switch from a standard unit to a climate controlled or heated unit, and vice versa. If you need to switch to a different storage unit, please speak to your facility manager for details.

Can I get help choosing a size?

Call us 24/7 or stop by your local facility and our storage experts will be happy to help you choose a size. You can also check out this Self Storage Calculator.

How should I pack my storage unit?

Start by packing the outer edges of your storage unit first, putting the most frequently used items near the front. This will help you create walkways and keep your most-used belongings close for easy access.

Use your vertical space, placing larger items at the bottom and packing the unit upward to make the most of the height. Large items like couches and mattresses can even be turned on end to use that vertical space. Just be sure to properly protect your furniture so it doesn't get damaged.

For more helpful tips, check out our video on How to Pack a Storage Unit.


These units come in a variety of dimensions and typically range anywhere from about a 4' x 4' x 4' unit to an 8’ x 4’ x 5’ unit to a 5’ x 10’ x 4’ unit. Our storage closets are for personal items like luggage, seasonal clothing, duffel bags, books, or paper documents and can fit about 6 to 8 medium boxes. Other items typically stored in closet units include:
  • Seasonal décor
  • Sports equipment
  • Window AC units
  • Pots and Pans
  • Small-Medium boxes

What size is a small storage unit?

Generally 25 - 50 sq ft, if you can see your items fitting in a standard or walk-in closet, then a small storage unit is the space you're looking for.
You'll be able to fit a room of furniture and some boxes, or a one-bedroom apartment. Small storage units can also accommodate business files and records and hold anywhere from 30 to 130 boxes.

What size is a medium storage unit?

These units are between 81 and 150 sq ft. If you can see your items fitting in an average bedroom when everything is packed and stacked up, then a medium storage unit is probably what you're looking for. Items typically stored in a medium unit are:
  • Chairs
  • Sofas
  • Desks
  • A mattress and frame
These units are great for storing the contents of a two-bedroom home.

What size is a large storage unit?

Generally, these units are 151 - 300 sq ft. If you can visualize your items packed and stored in a large living room or one car garage, then a large storage unit is what you're looking for. Items typically stored in a large storage unit include:
  • Desks
  • Bookcases
  • Patio furniture
  • Sofas
  • Beds
Large storage units hold a three-bedroom home. These units have enough space to place shelving and boxes of files in your unit and are often used by moving families or small businesses.

What size is an extra-large storage unit?

These units are typically 301 sq ft and up. If your items could be stored and packed in a space about the size of a two car garage, then an extra large storage unit is what you're looking for. Items typically stored in an extra-large storage unit include:
  • Mattress sets
  • Sofas
  • Patio furniture
  • Baby cribs
  • Appliances
Extra large storage units can store an entire five-bedroom home or more. These are also great units for businesses to store inventory or tools.

What size are your parking units?

Parking spaces are generally between 18 and 38 ft deep, and can be large enough to accommodate your car, truck, boat, RV, trailer, jet skis, or RTVs.
Please contact your desired location for more information on parking availability.

What fits in a 5x5 storage unit?

About the size of a small, half bathroom, the 5x5 storage unit is great for storing one room of small furniture. Items typically stored in a 5x5 include:
  • Small furniture
  • Twin mattress
  • Dresser
  • Seasonal decor
  • Pool accessories
  • Garden equipment
  • End tables
  • Boxes
Works well for a car, small truck, or SUV load. To learn more, check out these helpful tips on how much fits in a 5X5 storage unit.

What fits in a 10x10 storage unit?

This is the size of an average bedroom, good for two rooms of furniture or a one bedroom house. Items typically stored in a 10x10 storage unit include:
  • Appliances
  • Table & chairs
  • Bedroom set
  • Sports & outdoor equipment
  • Living room furniture
  • Filing cabinets
  • Bicycles, garden equipment, and seasonal decor
Works well if you have a 6x12 trailer or 10x10 moving truck. To learn more, check out these helpful tips on how much fits in a 10X10 storage unit.

What fits in a 10x15 storage unit?

The size of a large bedroom or small garage, these units are excellent for a two bedroom apartment or home if you aren't storing appliances, too. Items typically stored in a 10x15 storage unit include:
  • King-size bed set
  • Sofa & chairs
  • Dining room set
  • Piano
  • Appliances
Ideal for 14' - 16' truck loads.

What fits in a 10x20 storage unit?

This is the size of an average one car garage or living room. Perfect for larger two bedroom homes, or if you have appliances you need to store. Items typically stored in a 10x20 storage unit include:
  • Washer/dryer set
  • Multiple bedroom sets
  • King or queen size beds
  • Dining room sets
  • Couch & loveseat
  • Large appliances
  • Large outdoor equipment
  • One car or truck
Works well for 20' to 24' truck loads. To learn more, check out these helpful tips on how much fits in a 10X20 storage unit.

What fits in a 20x20 storage unit?

This is about the size of a two car garage. Ideal for large two to three bedroom homes with appliances and boxes. Items typically stored in a 20x20 storage unit include:
  • A car or truck + a room of furniture
  • Antiques
  • Refrigerator
  • Multiple bedroom sets
  • Large outdoor equipment
  • Multiple sets of office furniture
  • Couch, loveseat, and chairs
Ideal if you're moving a truck & trailer combo or have a 40' moving van. To learn more, check out these helpful tips on how much fits in a 20X20 storage unit.
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