Storage Unit Size Guide: What Fits in Each Unit and How to Choose
Safe Storage 365
August 26th, 2025
Moving, decluttering, or just needing a little extra room all come with the same big question: what size storage unit do I need? Choosing the right size isn’t just about guessing how much stuff you have—it’s about saving money, making your move easier, and avoiding the frustration of renting too little (or paying for space you don’t need).
At SafeStorage365, we see this question come up all the time, especially from residents and people moving to the area. The good news is, with a bit of planning, you can figure it out quickly and confidently.
Understanding Storage Unit Sizes
Storage units are measured in square feet—usually width times length—and most facilities have ceilings around 8 feet tall, giving you a lot of vertical space.
For example, a 10x10 unit is 100 square feet of floor space, but closer to 800 cubic feet when you factor in height. That means you can stack boxes or furniture carefully to maximize space.
Keep in mind, however, that layouts can vary by facility. Some may have slightly deeper or wider units, and ceiling heights aren’t always identical. Always ask your storage provider if you’re unsure.
Factors to Consider When Choosing a Storage Unit
Before you choose, think through a few key details. The amount and type of belongings is the obvious one—are you storing boxes, furniture, or vehicles? Duration matters too: if you’re storing long-term, you’ll want room to create small aisles so you can access things without unloading the whole unit.
Accessibility is another factor—if you plan on visiting often, you won’t want to pack stuff in so tightly that it’s impossible to move around. And don’t forget special considerations like fragile items or temperature-sensitive belongings that may require climate control.
Storage Unit Size Guide
Here’s a breakdown of standard sizes and what typically fits inside:
- 5x5 (25 sq. ft.): Think of a small walk-in closet. Great for a few boxes, small furniture, or seasonal items.
- 5x10 (50 sq. ft.): Comparable to a walk-in closet or half a bedroom. It can fit a sofa, dresser, or the contents of a studio apartment.
- 10x10 (100 sq. ft.): The most popular size. Fits the contents of a one-bedroom apartment, including appliances, boxes, and furniture.
- 10x15 (150 sq. ft.): Good for larger apartments or small houses, fitting multiple rooms of furniture plus appliances.
- 10x20 (200 sq. ft.): Equivalent to a one-car garage. It can fit the contents of a 2–3 bedroom home or a vehicle.
- 10x30 (300 sq. ft.): Large enough for a whole household move, business inventory, or vehicle plus additional belongings.
While the standard sizes cover most needs, it’s worth pointing out that not every facility sticks to these exact dimensions. Some storage providers also offer “in-between” sizes, like a 7.5x10 or 12x15, which can be perfect if you fall between categories.
For example, a 7.5x10 might be just right if you’re moving out of a small one-bedroom but don’t have appliances to store. A 12x15 can bridge the gap for growing families who have more than a 10x10 can handle, but don’t reasonably need the garage-sized space of a 10x20.
Another thing to remember is that square footage doesn’t always tell the whole story. A 10x15 unit with a tall ceiling may feel larger than a shorter but wider 10x20. This is where walking the property in person can help.
Bring a list of your most oversized items and visualize how they’ll fit—it’s much easier to decide when you’re standing inside a unit rather than looking at numbers on a website.
Storage Unit Examples by Lifestyle
The right size also depends on your situation. College students moving out for the summer often do well with a 5x5 or 5x10 for boxes, a bike, and dorm furniture. Families moving between homes may need a 10x20 to fit their belongings in transition.
Businesses often rent medium-to-large units for inventory, files, or equipment. And for vehicle, boat, or RV storage, most facilities offer specialized spaces that range from standard 10x20 units to covered outdoor parking.
If you’re a frequent traveler or part-time resident, a medium-sized unit may be your best friend. Many snowbirds use storage to keep vehicles, furniture, and seasonal gear safe while they’re away.
Similarly, military families often need temporary storage during deployments or relocations, and a 10x10 or 10x15 is usually the sweet spot.
For hobbyists, storage can free up a lot of space at home. Musicians often rent a small unit to keep instruments, amplifiers, or recording equipment organized. Outdoor enthusiasts may store kayaks, skis, camping gear, or motorcycles when they’re not in season.
Businesses, too, have more use cases than just inventory—contractors, landscapers, and even small online shops often rent storage for tools, equipment, or products, making it easier to operate without investing in a warehouse.
How to Estimate the Right Size at Home
Start by identifying your largest items—couches, beds, appliances, or patio furniture. Measure them and think about how they’ll stack. A sofa can often stand on end, and mattresses can lean against walls to save space.
Next, calculate the number of boxes you’ll need. A good moving rule is that one room of belongings equals about 10–15 medium boxes. You can also use online storage calculators from companies like SpareFoot to visualize what fits in each size.
Cost Considerations: Size vs. Price
Naturally, larger units cost more. Prices vary by location, but a good rule of thumb is that each size jump (for example, 5x10 to 10x10) increases cost by 20–30%. Upsizing can save frustration if you’re on the fence, but don’t overspend for unused space.
If you’re moving long-term and need occasional access, slightly larger may be worth it. For short-term moves, a tighter fit is usually fine.
Tips for Maximizing Space in Your Storage Unit
Packing smart makes a big difference. Use same-size boxes so they stack neatly and don’t topple. Place heavy items on the bottom, lighter ones on top.
Take furniture apart when possible—remove table legs, stack chairs, and store mattresses upright. Always leave a small aisle down the middle so you can reach everything without having to pull out boxes.
Think of your storage unit like a game of Tetris. The more efficiently you pack, the more space you’ll unlock. Use shelves if the facility allows them, especially for small, lightweight items.
Clear plastic bins are also worth the investment—they let you see what’s inside at a glance, and they stack sturdier than cardboard boxes. You can find durable moving supplies from places like Home Depot if you’re starting fresh.
Don’t forget to label every box clearly. A unit packed with 20 plain boxes becomes a headache when you need just one item. Place labels on the front and top so they’re visible even when stacked.
If you’ll be coming back often, keep frequently used items near the entrance for easy grab-and-go access.
Finally, think about airflow: avoid pressing items directly against walls to reduce the chance of moisture buildup. Even a small gap can make a difference over time.
Storage Unit Height: The Forgotten Dimension
People often overlook ceiling height. With most units at 8 feet, you can stack boxes high, but safety matters. Use sturdy boxes and avoid stacking uneven shapes like lamps or chairs on top.
If you’re storing fragile or valuable items, don’t push height limits just to save floor space. Instead, consider a slightly larger unit where you can spread things out securely.
Climate Control and Add-On Services
Not everything belongs in a standard unit. Electronics, wood furniture, photos, and clothing often do better in climate-controlled storage. These units regulate temperature and humidity, protecting against warping, mold, or heat damage.
Add-on services like drive-up access, 24-hour surveillance, or storage insurance also add peace of mind. Some facilities even offer moving supplies and dollies to make loading easier.
Mistakes to Avoid When Choosing a Storage Unit
The most common mistake is going too small to save money. Overflow leads to frustration and sometimes an emergency second unit. Another mistake is forgetting seasonal or outdoor items like grills, bikes, or lawn equipment when estimating size.
Finally, some renters overpay for a unit that’s much larger than they need. Take time to measure and plan, and you’ll avoid these pitfalls.
FAQs About Storage Unit Sizes
What size do I need for a 1-bedroom apartment?
-Usually a 10x10, depending on how much furniture you have.
Can I fit a vehicle in a storage unit?
-Yes, most cars fit in a 10x20. For trucks or larger SUVs, check with the facility first.
What happens if I outgrow my unit?
-Most facilities allow you to transfer to a larger unit if one is available, so don’t stress if you need more space.
For more quick tips on moving and storage, Moving.com has helpful guides that can give you packing and relocation ideas beyond just storage.
Conclusion: Choosing the Perfect Storage Unit
The proper storage unit size depends on your belongings, your situation, and how often you’ll need access. Small units are perfect for students or seasonal storage, medium sizes cover most apartments, and large units handle home moves or vehicles.
Planning, measuring your items, and asking the right questions will make the process much smoother. If you’re ready to find a secure, local option, you can explore storage unit sizes and availability at SafeStorage365 to get started today.
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