Homeowners and Movers: A Storage Unit Size Guide

Choosing an incorrect sized storage unit is a very common mistake. (and costly!)

Rent too small you have boxes piled to the ceiling you can't reach. Rent too big you're paying for dead space month after month.

Here's the thing...

A great storage unit size guide simplifies this choice. Plus, knowing what size you need can save you time, money and major hassle.

What's covered in this guide:

1. Why Storage Unit Size Actually Matters
2. The Most Common Storage Unit Sizes Explained
3. How To Pick The Right Size For Your Situation
4. Tips For Getting The Most Out Of Your Unit

Why Storage Unit Size Actually Matters

Self-storage units are becoming more widely used than ever before. Right now, 1 in 3 Americans rents a storage unit and another 18% say they will rent one in the future.

That's a massive number of people making this decision every year.

And most of them get it wrong on the first try.

Why? They estimate. They visualize their goods mentally, throw out a ballpark figure, and sign the rental agreement. This causes them to pay too much for space or stuff everything in so tight you can't get to anything.

42% of renters utilized a storage unit while transitioning between homes. This means the majority of consumers are renting during one of the most hectic times. (When moving, the last thing anyone wants is to re-measure and pay for more!)

Getting the right size from the start changes everything.

The Most Common Storage Unit Sizes Explained

This is the section most guides fail to include -- explaining what sizes actually fit real life.

5x5 (The Small Stuff Unit)

Think of this as a large walk-in closet.

A 5x5 unit is ideal for:

• Seasonal items like holiday decorations
• A few boxes of clothes or books
• Small furniture pieces like an end table or office chair
• Sports equipment and outdoor gear

It works great if there's just some stuff to clear out. It is not ideal for furniture from an entire room.

5x10 (The One-Room Unit)

This is one of the most popular sizes for good reason.

A 5x10 unit fits the contents of a small bedroom or studio apartment. That includes a mattress set, dresser, some boxes, and even a sofa. For anyone moving out of a studio or one-bedroom apartment without enough room in the new place, this is the starting point.

10x10 (The Most Popular Size)

The 10x10 is the workhorse of the self-storage world.

It fits the contents of a one to two bedroom apartment comfortably. This includes:

• All major furniture pieces (sofa, bed, dining table, chairs)
• Appliances like a washer, dryer, or refrigerator
• 10 to 15 medium packing boxes
• A bicycle or two

That's why it is always the most common size unit by sales dollars per IBISWorld industry research.

10x15 (The Growing Family Unit)

The 10x15 bridges the gap between a standard unit and a large one.

It easily fits everything in a two or three bedroom house. When moving an entire house full of furniture -- beds, couches, dining room tables, appliances -- a 10x15 is a serious option to consider.

10x20 (The Full Home Unit)

This size is the second most popular of all. Easy to see why.

A 10x20 unit is about the size of a one car garage. It easily holds everything in a three to four bedroom house. Including big furniture, several appliances, and dozens of moving boxes.

Perfect for a whole house move or clearing out several rooms for a house renovation.

10x30 (The Largest Standard Unit)

The 10x30 is built for major moves, business inventory, or long-term full-household storage.

The sparefoot.com/storage-unit-size-guide/10×30-storage-unit page breaks this size down in full -- and it comfortably stores everything inside a four to five bedroom house. Furniture equivalent to several cars, bulky appliances, patio items and commercial goods.

Additionally, this is a great option for contractors and small business owners looking for a place to store equipment, materials, or tools long-term.

How To Pick The Right Size For Your Situation

There's a simple method to get this right every time.

Step 1: Take inventory

Make a list of every big thing being stored -- all furniture, appliances, bicycles, sporting equipment. Don't try to remember everything.

Step 2: Estimate your box count

The typical move will produce boxes beyond initial estimates. On average a one bedroom apartment will yield 20-30 boxes. A full 3 bedroom house will yield 60+ boxes.

Step 3: Add a buffer

The most common error is selecting the exact size needed. Instead, size up one level. Boxes behave differently when stacked in real life versus on paper, and odd-shaped items occupy significantly more room than expected.

Step 4: Consider the access factor

If the unit will be accessed regularly -- storing seasonal items, operating a home business, or frequently storing and retrieving items -- keep aisle space in mind. Overstuffing a unit so that there's no aisle can make reaching everything more difficult.

Here's a quick size-to-situation breakdown:

Tips For Getting The Most Out Of Your Unit

Step one is picking the correct size. Step two is maximizing it.

These are the tips that actually make a difference:

• Take apart bulky furniture. Beds, desks, and shelving units flatten out significantly.
• Stack boxes strategically. Put the heaviest boxes on the bottom and lightest boxes on top. Boxes that are the same size stack easier.
• Maximize vertical space. The majority of standard units are between 8-10 feet tall. Purchase shelving units to fully utilize every foot of space.
• Label all boxes on the sides, never the tops. Boxes are stacked, so the only label visible is on the side.
• Designate a main aisle. Even a small walkway down the center of the unit will save hours of aggravation when searching for things.
• Keep commonly accessed items closer to the front. Winter coats, boxes of documents, or power tools used frequently should be kept near the door -- not in the back corner.

Climate control should also be taken into account. If storing furniture, electronics, artwork, documents or anything else that could be affected by extreme temperatures and humidity, it's worth the additional expense for a climate-controlled unit.

Wrapping Things Up

Choosing the right storage unit size doesn't have to be complicated.

Begin with an accurate inventory, estimate number of boxes and generally size up. Size appropriately given the situation from the guide above and consider how frequently access will be needed.

To quickly recap the key sizes:

• 5x5: Boxes, small items, seasonal clutter
• 5x10: Studio or one-room contents
• 10x10: Most popular -- fits a 1-2 bedroom apartment
• 10x15: 2-3 bedroom home contents
• 10x20: Full 3-4 bedroom home
• 10x30: Large homes, business inventory, or long-term full-household storage

If sized correctly from the beginning, storage becomes much easier.

Related articles from FINE Magazine:

• Why Smart Storage Supports Home Moves and Property Operations
• When Does Self Storage Make Sense in Everyday Life?
• Why Temporary Storage Is a Smart Move During Relocation