What Size Storage Unit Do I Need? A Room-by-Room Guide
Choosing the wrong size storage unit is one of the most common — and most expensive — mistakes renters make. Rent too small and you’re stuck cramming boxes on top of furniture, damaging both. Rent too large and you’re paying for empty space every month. This room-by-room guide walks you through matching your belongings to the right unit size, using real capacity examples from the sizes Arborstone Storage offers across Oklahoma, Texas, and Arkansas.
5×5 Storage Unit: The Closet Equivalent
A 5×5 unit — about 25 square feet — holds roughly the same volume as a small home closet. It’s the right choice for boxes of seasonal clothing, holiday decorations, a few smaller pieces of luggage, or a season’s worth of school-year belongings for a student. Think of it as “extra closet space, off-site.” You won’t fit furniture beyond a small chair or ottoman, but for compact belongings that just need to be out of the way, this is the most affordable option.
5×10 Storage Unit: The Walk-In Closet
At 50 square feet, a 5×10 doubles the floor space and starts to accommodate small furniture. This is the go-to size for a dorm room or studio apartment worth of belongings: a mattress and box spring stood on end, a small dresser, several boxes of books, and personal items. Motorcycles, bicycles, and a set of tires also fit comfortably. It’s a common choice for students home for the summer and for renters between apartments.
10×10 Storage Unit: The One-Bedroom Apartment
The 10×10 unit — 100 square feet — is the workhorse of self-storage. It reliably holds the contents of a one-bedroom apartment: a queen bed, dresser, sofa, small dining set, television, and 15-20 boxes. Because it’s roughly the footprint of a small bedroom, it’s easy to visualize what will and won’t fit. If you’re consolidating from a shared living situation or storing while traveling for a season, this is usually the size to consider first.
10×15 Storage Unit: The Two-Bedroom Apartment
Adding another 50 square feet takes you to a two-bedroom apartment’s worth of storage. A 10×15 fits the contents of two bedrooms — beds, dressers, a full living room set, a modest kitchen table with chairs, and 25-30 boxes. There’s still room for a bicycle, small appliances, and seasonal items. Households downsizing from a starter home into a rental, or storing while doing a whole-home renovation on a small home, most often need this size or the next one up.
10×20 Storage Unit: The Two- to Three-Bedroom Home
At 200 square feet, the 10×20 fits the contents of a two- to three-bedroom house. Kings and queen beds, a full dining set, multiple dressers, a couch and sectional, a refrigerator or washer/dryer, and 40-plus boxes will all fit with careful packing. This unit is also large enough to store a compact car alongside some household items, if the facility permits vehicle storage. Homeowners in transition — selling before their next home closes, deploying for military service, or living abroad for a year — typically land here.
10×25 Storage Unit: The Three- to Four-Bedroom Home
The 10×25 pushes into full-house territory. A three- to four-bedroom home’s furniture, appliances, and packed boxes fit inside 250 square feet with room to walk between items. This size also handles a full car plus household goods, or a boat and trailer with space left over for tools and supplies. Estate downsizing, cross-country moves waiting on the arrival end, and business inventory storage often use a 10×25.
10×30 Storage Unit: The Four- to Five-Bedroom Home or Two-Car Garage
At 300 square feet, the 10×30 is roughly the size of a two-car garage. It holds the contents of a four- to five-bedroom home — every piece of furniture, appliances, a piano, and 60-plus boxes — with aisle space for accessing items. It’s also the size vehicle owners choose when they want to store a vehicle indoors alongside household goods, or when a family needs long-term storage during an extended overseas assignment.
12×30 and 13×30 Storage Units: Vehicle and Oversized Household
Once you cross into 360-plus square feet, you’re in specialty territory. A 12×30 or 13×30 unit handles boats up to 30 feet, RVs, oversized vehicles, and household contents that exceed what a standard garage would hold. These sizes are also useful for small-business inventory that requires drive-up access — landscaping supplies, contractor tools, event equipment.
How to Estimate What You’ll Need Without Measuring Everything
If measuring every piece of furniture sounds tedious, use the room-count shortcut: one small room’s worth of belongings usually fits in a 5×10, a one-bedroom in a 10×10, and each additional bedroom adds roughly 50 square feet. Round up rather than down. It’s cheaper to slightly over-size than to rent a second unit later, and unused space gives you room to walk in and access what you need.
When to Consider Climate Control Instead of Just More Space
Climate-controlled storage doesn’t change how much fits — it changes what survives long-term. If any of the following are going into storage, size up to a climate-controlled unit at one of Arborstone’s climate-controlled facilities instead of just a larger drive-up unit: wood furniture, leather goods, electronics, photographs, documents, artwork, musical instruments, or anything with adhesive or veneer. Ten of Arborstone’s 62 facilities offer climate-controlled units.
How Access Hours Should Factor Into Your Size Decision
A larger unit is only useful if you can get to what’s stored at the back. Before renting, check the facility’s access hours: Arborstone offers 24-hour gate access at all 62 facilities for a small additional fee, so a 10×30 with items packed to the back still works for a shift-worker or someone who needs weekend access. If the facility you’re considering elsewhere restricts access to business hours only, factor that into how deep you’re willing to pack.
What to Do If You’re Between Sizes
If your belongings fall between two size categories, size up by one. The monthly cost difference between a 10×10 and a 10×15, or between a 10×20 and a 10×25, is usually less than the cost of one U-Haul trip if you have to unload and re-pack into a bigger unit later. The extra 50 square feet also lets you walk into the unit and access items without unloading everything else first.
Find the Right Size at an Arborstone Storage Facility Near You
Every Arborstone Storage facility across Oklahoma, Texas, and Arkansas carries multiple unit sizes side-by-side, so if the size you reserved doesn’t work once you’re loading, you can usually swap into an adjacent unit the same day. Browse all Arborstone locations to find the facility nearest you, or explore each unit size in depth: 5×5, 5×10, 10×10, 10×15, 10×20, 10×25, and 10×30.
Final Thoughts
The right storage unit size is the smallest one you can rent without cramming or blocking access. When in doubt, size up one step — it costs less than upgrading later and keeps your belongings safer. Match your unit to the room you’d need to hold everything, not to the room it was last stored in, and you’ll pick correctly the first time.