Renting a storage unit seems simple enough—until you’re standing in front of one that’s either way too small or unnecessarily large (and expensive). The wrong size can cost you extra money every month or leave you cramming belongings into an unworkable space. So how do you make sure you pick the right size from the start? Here’s everything you need to consider before signing that rental agreement.
Understanding Storage Unit Sizes
Storage facilities typically offer a range of unit sizes, but the standard options fall into a few common categories:
- Small Units (5×5 or 5×10) – These are about the size of a closet and work well for storing seasonal decorations, a few boxes, or small furniture pieces.
- Medium Units (10×10 or 10×15) – Roughly the size of a small bedroom, these units can hold furniture from a one-bedroom apartment or a mix of household items.
- Large Units (10×20 or 10×30) – Equivalent to a garage, these are ideal for storing the contents of an entire home, including furniture, appliances, and large items like vehicles or business inventory.
Now, let’s get into the real question: how do you figure out what size you actually need?
Assess What You’re Storing
Before choosing a unit, take a full inventory of what you plan to store. This step prevents overestimating (wasting money) or underestimating (leading to frustration later). Are you storing mostly boxes? Large furniture? Bulky items like mattresses or appliances? If possible, group your belongings together and measure the total space they take up. You can then use this storage unit size guide to determine the size that’s right for you.
Consider stacking—many people forget that storage units allow vertical stacking, which can significantly reduce the floor space needed. Sturdy boxes and furniture pieces like dressers can be stacked to maximize the area.
Think About Accessibility Needs
Are you planning to retrieve items frequently, or is this a long-term storage situation where you won’t need regular access? If you need to visit often, choosing a slightly larger unit might be worth the cost so you can create walkways and avoid digging through piles of belongings. If everything can be packed tightly and left untouched, a smaller unit might suffice.
Consider Future Storage Needs
If your storage needs might grow—such as during a move, home renovation, or business expansion—renting a slightly larger unit could save you from having to relocate everything later. However, if you know you’ll be downsizing or removing items soon, opting for a smaller space could be more cost-effective.
Getting the Size Right
Here’s a practical way to determine the right storage unit size without guessing:
- List Everything You Plan to Store – Write down all large items and estimate the number of boxes. This prevents surprises.
- Measure or Estimate the Space Needed – Stack boxes and furniture at home to get an idea of the required dimensions.
- Use a Storage Calculator – Many facilities provide online tools that estimate the unit size based on your inventory.
- Factor in Stacking & Walkways – Utilize vertical space but leave paths if you need regular access.
- Compare Costs Between Sizes – If a slightly larger unit is only a few dollars more, it may be worth upgrading for ease of use.
Common Mistakes That Lead to Overspending
One of the biggest mistakes people make is overestimating the amount of space they need. Many assume they need the biggest unit just to be safe, but proper organization and stacking can drastically reduce space requirements.
Another common issue is failing to account for awkwardly shaped or oversized items. If you have things like a sectional sofa or tall bookshelves, make sure they fit within the dimensions of the chosen unit.
Some also overlook climate-controlled storage, which might be necessary for sensitive items like electronics, artwork, or important documents. Choosing a larger, non-climate-controlled unit to save money could backfire if your belongings get damaged.
Test Fit Before You Commit
If you’re still unsure, visit the storage facility and physically look at different unit sizes. Some places offer visual guides or show example units with common household items inside, giving you a better sense of space.
If that’s not an option, map out the dimensions in your garage or driveway with tape or chalk to visualize how your belongings will fit. It’s a simple trick that can prevent overpaying for unused space.
Final Thoughts: Pay for What You Actually Need
Choosing the right storage unit size is all about balance—too small, and you’ll struggle with space; too big, and you’ll waste money on unused square footage. By planning ahead, taking inventory, and thinking about accessibility, you can find the perfect fit without overspending. Before signing the lease, double-check the layout of your items, compare prices, and ensure you’re getting exactly what you need.
