How to Choose the Right Storage Unit Size and Type: Your Complete Guide

By Brittany Bouvy

How to Choose the Right Storage Unit Size and Type: Your Complete Guide

Find the perfect storage solution for your belongings, your budget, and your lifestyle.

Whether you're moving, downsizing, renovating, expanding your business, or simply running out of space at home, renting a self storage unit can make life a whole lot easier. But with so many sizes and types of storage units available, how do you know which one is right for you?

At The Storage Mall, we believe finding the right storage solution should be simple. That's why we've put together this guide to help you understand your options, estimate how much space you'll need, and make the most of your storage unit.

Understanding Storage Unit Sizes: How Much Space Do You Really Need?

One of the most common questions we hear is, "What size storage unit do I need?"

The answer depends on what you're storing, how you plan to organize it, and whether you'll need regular access to your belongings.

Storage units come in a wide range of sizes, from small spaces perfect for seasonal decorations to oversized units capable of accommodating vehicles, business equipment, and the contents of an entire home.

Here's a breakdown of common storage unit sizes and what you can typically fit inside.

Small Storage Units: 5x5 to 5x15

5x5 Storage Unit | 25 Square Feet

Approximately the size of a small walk-in closet.

Perfect for:

Holiday decorations and seasonal items
Small furniture, lamps, and end tables
Boxes of clothing, books, and household items
Sports equipment and luggage
College dorm room belongings

Helpful Hint: A 5x5 unit is a great option for college students who need somewhere to keep their belongings during summer break.

5x10 Storage Unit | 50 Square Feet

Approximately the size of a large walk-in closet.

Perfect for:

Contents of a small studio apartment, depending on furniture size
A mattress set and small furniture pieces
Bicycles and outdoor equipment
Small appliances and moving boxes
Extra inventory for a small business

Helpful Hint: If you're storing a mattress, consider standing it upright when appropriate and using a protective mattress bag to maximize space.

5x15 Storage Unit | 75 Square Feet

Approximately the size of a large walk-in closet or narrow storage room.

Perfect for:

Furniture from a small one-bedroom apartment
Bedroom furniture and several boxes
Seasonal business inventory
Long items such as shelving and certain outdoor equipment

Helpful Hint: The longer layout of a 5x15 unit can be particularly useful for storing furniture and other bulky items.

Medium Storage Units: 10x10 to 10x15

10x10 Storage Unit | 100 Square Feet

Approximately the size of a standard bedroom.

Perfect for:

Contents of a one- to two-bedroom apartment, depending on furnishings
Living room and bedroom furniture
Major appliances
Dining room furniture
Multiple mattresses and moving boxes
Business supplies and inventory

Helpful Hint: A 10x10 is a popular choice for customers who are moving or remodeling. It offers a balance between space and affordability.

10x15 Storage Unit | 150 Square Feet

Approximately the size of a large bedroom.

Perfect for:

Contents of a furnished two-bedroom home or apartment
Multiple bedroom sets
Large furniture and appliances
Outdoor furniture and equipment
Business inventory, tools, and supplies

Helpful Hint: If you're between a 10x10 and a 10x15, consider how often you'll need access to your belongings. A little extra room can make navigating your unit much easier.

Large Storage Units: 10x20 to 10x30

10x20 Storage Unit | 200 Square Feet

Approximately the size of a standard one-car garage.

Perfect for:

Contents of a three-bedroom home, depending on furnishings
Large furniture sets and appliances
Certain cars and motorcycles, where vehicle storage is permitted
Commercial equipment and inventory
Moving and relocation storage

Helpful Hint: If you're storing a vehicle, always measure its total length, width, and height, including mirrors and accessories. Verify the unit's door dimensions before renting.

10x25 Storage Unit | 250 Square Feet

Approximately the size of an oversized one-car garage.

Perfect for:

Contents of a larger three- to four-bedroom home
Bulky furniture and appliances
Large business inventory
Equipment and tools
Certain vehicles with additional storage space

Helpful Hint: If you're storing both a vehicle and household belongings, a 10x25 may provide the additional room you need to keep items organized.

10x30 Storage Unit | 300 Square Feet

Approximately the size of a large garage.

Perfect for:

Contents of a large four- to five-bedroom home, depending on furnishings
Multiple rooms of furniture
Business inventory and commercial equipment
Certain vehicles, trailers, or recreational equipment
Large moving and relocation projects

Helpful Hint: Large storage units can be especially useful for homeowners undergoing major renovations or businesses needing flexible storage without committing to additional warehouse space.

Extra-Large Storage Units: 10x35 to 10x40

10x35 Storage Unit | 350 Square Feet

An excellent option for customers with substantial storage needs.

Perfect for:

Contents of a large household
Commercial equipment and inventory
Contractor tools and supplies
Large furniture collections
Certain vehicles and equipment, depending on dimensions

Helpful Hint: If you need to access tools, equipment, or inventory regularly, organize your unit into designated sections and leave a clear walkway.

10x40 Storage Unit | 400 Square Feet

One of the largest storage sizes available at select facilities.

Perfect for:

Large household moves
Extensive commercial inventory
Contractor and business equipment
Multiple furniture sets and large appliances
Certain oversized vehicles or recreational equipment, where permitted

Helpful Hint: A 10x40 unit can be an excellent solution for businesses that need substantial storage space while maintaining the flexibility of a rental.

Quick Storage Unit Size Comparison Chart

Unit SizeSquare FeetCommon Uses

5x5

Boxes, seasonal décor, small items

5x10

Studio belongings, small furniture

5x15

Small apartment furniture, equipment

10x10

100

One- to two-bedroom apartment

10x15

150

Furnished two-bedroom home

10x20

200

Three-bedroom home, certain vehicles

10x25

250

Larger household, business inventory

10x30

300

Large household, equipment

10x35

350

Commercial inventory, large moves

10x40

400

Extensive household or business storage

These are general estimates. Actual storage capacity depends on the size and shape of your belongings, packing methods, ceiling height, and the usable dimensions of the unit.

Choosing the Right Type of Storage Unit

Selecting the right size is only half the equation. The type of storage unit you choose can make a big difference in convenience, accessibility, and how well your belongings are protected from environmental conditions.

At The Storage Mall family of properties, customers may find several different storage options designed to accommodate a variety of needs.

Drive-Up Storage Units: Convenience at Your Doorstep

Drive-up storage units are among the most convenient options available.

These units allow you to pull your car, truck, or moving vehicle directly up to the storage unit door, making loading and unloading quick and easy.

Best for:

Heavy furniture and appliances
Frequent loading and unloading
Moving and relocation
Business inventory
Tools and equipment
Customers who want easy access

Why Choose Drive-Up Storage?

Drive-up units can reduce the distance you need to carry heavy or bulky items. This is especially helpful during a move or when accessing stored items frequently.

Storage Tip: Keep frequently used items near the front of your unit so you can retrieve them without unpacking everything.

Climate-Controlled Storage Units: Added Protection from Temperature Extremes

Some belongings are more sensitive to temperature fluctuations than others.

Climate-controlled storage units are designed to maintain a more consistent temperature range than traditional storage units, helping reduce exposure to extreme heat and cold.

Best for:

Wooden furniture and antiques
Electronics and computers
Photographs and important documents
Musical instruments
Leather furniture and accessories
Artwork and collectibles
Temperature-sensitive household items

Why Choose Climate-Controlled Storage?

Extreme temperatures can cause certain materials to expand, contract, warp, or deteriorate over time.

Climate-controlled storage is particularly worth considering for long-term storage or when storing items that could be affected by seasonal temperature changes.

Storage Tip: Climate control does not eliminate every environmental risk. Use appropriate protective coverings, keep belongings clean and dry, and consider moisture-absorbing products when suitable. Temperature control and humidity control are not necessarily the same feature, so ask your facility which conditions are regulated.

Interior Non-Climate-Controlled Storage Units: Practical and Budget-Friendly

Interior non-climate-controlled units are typically located inside a building but do not offer regulated temperatures.

These units can provide an additional barrier from direct sunlight, rain, and other outdoor conditions while often offering a more economical storage option.

Best for:

Household items that tolerate temperature changes
Plastic storage bins
Metal furniture and shelving
Seasonal decorations
Sporting goods
Tools and other durable equipment

Why Choose Interior Non-Climate-Controlled Storage?

If you're storing items that aren't especially sensitive to temperature changes, an interior non-climate-controlled unit may offer the space you need at a lower cost than climate-controlled storage.

Storage Tip: Use sturdy plastic bins instead of cardboard boxes when practical, and avoid placing moisture-sensitive items directly on the floor.

Outdoor Parking Storage: Room for Your Bigger Toys

Sometimes the things you need to store won't fit inside a traditional storage unit.

Outdoor parking spaces can offer a convenient solution for storing vehicles and recreational equipment when you don't have enough room at home.

Best for:

Cars and trucks
Boats and boat trailers
RVs and campers
Utility trailers
Recreational vehicles
Certain commercial vehicles, where permitted

Why Choose Outdoor Parking Storage?

Outdoor parking can help free up driveway space, reduce neighborhood parking challenges, and provide a designated location for vehicles or equipment you don't use every day.

Storage Tip: Before reserving a parking space, measure the full length and width of your vehicle, including the trailer hitch, mirrors, and any attached accessories. Check facility requirements regarding registration, insurance, vehicle condition, and permitted vehicle types.

For long-term parking, consider a properly fitted weather-resistant cover and follow the vehicle manufacturer's storage recommendations.

Contractor Storage Spaces: Storage That Works as Hard as You Do

For contractors, tradespeople, and small business owners, having the right storage setup can make daily operations significantly easier.

At select Storage Mall properties, specialized contractor storage spaces may offer features beyond those of a traditional storage unit, including electrical outlets and additional lighting.

These features can provide added convenience for organizing tools, accessing equipment, and managing supplies.

Best for:

General contractors
Electricians and plumbers
HVAC professionals
Landscapers
Painters and remodeling professionals
Maintenance companies
Small business owners

Why Choose Contractor Storage?

Contractor spaces can help businesses keep valuable tools, materials, and equipment organized without cluttering a garage or requiring a larger commercial property.

Features such as additional lighting can make it easier to locate supplies, while available electrical outlets may offer added convenience for approved uses.

Storage Tip: Organize tools by category, label shelving, and maintain a simple inventory list. Store frequently used equipment near the entrance to save time at the beginning and end of each workday.

Always confirm permitted electrical uses, business activities, and access policies with the specific facility. Contractor storage spaces are intended for storage and approved related uses, not automatically for use as workshops or occupied commercial spaces.

10 Expert Tips for Making the Most of Your Storage Unit

Once you've selected your storage unit, a little preparation can help you maximize your space and keep your belongings organized.

1. Take Inventory Before You Rent

Make a list of everything you plan to store, including large furniture, appliances, boxes, and equipment. This will help you estimate how much room you actually need.

2. Measure Your Largest Items

Measure couches, mattresses, appliances, shelving, and other bulky items before selecting a unit. Remember to consider the storage unit's door opening and ceiling height.

3. Think Vertically

Take advantage of the unit's height by stacking sturdy, similarly sized boxes and using freestanding shelving where permitted. Always place heavier items at the bottom.

4. Create a Walkway

If you'll need to access your belongings regularly, leave a small aisle through the unit. This can save you from having to unload everything just to reach one box.

5. Use Clear, Labeled Containers

Transparent storage bins make it easier to identify contents, while labels help you find what you need quickly.

6. Disassemble Furniture When Possible

Removing table legs, bed frames, and other detachable components can help you save valuable floor space. Keep screws and hardware in labeled bags attached securely to the corresponding furniture.

7. Protect Your Belongings

Use mattress bags, furniture covers, moving blankets, and appropriate packing materials to help prevent scratches, dust buildup, and other avoidable damage.

8. Keep Frequently Used Items Near the Front

Holiday decorations, business supplies, seasonal clothing, and other frequently accessed belongings should be placed where they're easy to reach.

9. Don't Forget About Access

Consider how often you'll visit your unit. If you're accessing belongings weekly, a larger unit or a drive-up option might be worth the added convenience.

10. Plan for Future Storage Needs

If you expect to add more items over time, choosing a slightly larger unit now may help you avoid having to relocate your belongings later.

Common Mistakes to Avoid When Renting a Storage Unit

Even experienced renters can overlook a few important details when choosing storage.

Choosing a Unit That's Too Small

While smaller units may cost less, an overcrowded unit can make it difficult to access belongings and may increase the risk of damage from improper stacking.

Paying for More Space Than You Need

On the other hand, renting an oversized unit can mean spending money on unused space. Taking inventory and measuring your belongings can help you find the right balance.

Overlooking Temperature Sensitivity

Not every item is suited for traditional storage. Consider whether your belongings could be affected by extreme heat or cold before choosing a non-climate-controlled unit.

Forgetting About Accessibility

Think about how you'll transport your belongings into the unit. Interior storage may require navigating hallways, doors, or elevators, while drive-up storage may make moving bulky items easier.

Ignoring Facility Policies

Before moving in, review the facility's access hours, payment terms, insurance requirements, and restrictions on prohibited items. Flammable materials, perishable goods, and certain other items are generally not permitted in storage units.

Frequently Asked Questions About Storage Unit Sizes and Types

What is the most popular storage unit size?

The 10x10 storage unit is a commonly selected size because it offers approximately 100 square feet of storage space and can accommodate furniture, appliances, and boxes from many apartments and smaller homes.

How do I know if I need climate-controlled storage?

If you're storing temperature-sensitive belongings such as electronics, wooden furniture, musical instruments, or important documents, climate-controlled storage may be worth considering. Your local climate and the length of time you plan to store your items are also important factors.

Can I store a car inside a storage unit?

Some larger drive-up storage units can accommodate vehicles, but not every unit or facility permits vehicle storage. Confirm the unit's dimensions, door clearance, and vehicle storage policies before renting.

What size storage unit do I need for a three-bedroom house?

A 10x20 unit is often a good starting point for the contents of a three-bedroom home. However, larger homes, oversized furniture, and additional belongings may require a 10x25 or 10x30 unit.

Can businesses rent storage units?

Absolutely! Self storage can be a flexible solution for businesses needing additional room for inventory, tools, equipment, records, or seasonal supplies. Some locations also offer contractor-focused spaces with additional lighting and electrical outlets for approved uses.

Is outdoor parking a good option for an RV or boat?

Outdoor parking can be a convenient option for RVs, boats, and trailers. Be sure to confirm space dimensions, facility rules, and any vehicle requirements before making a reservation.

Is it better to rent a slightly larger storage unit?

If you're between two sizes, consider whether you'll need room to move around, retrieve belongings, or add more items later. A slightly larger unit can provide valuable flexibility, but the best choice depends on your storage needs and budget.

Find Your Perfect Storage Solution with The Storage Mall

No two storage needs are exactly alike. Whether you're clearing out a closet, preparing for a big move, storing your recreational vehicle, or looking for additional space for your business, choosing the right storage unit can make the entire experience easier.

At The Storage Mall family of properties, we're committed to helping customers find convenient, practical storage solutions that fit their needs.

From compact 5x5 units to spacious 10x40 units, and from traditional drive-up storage to climate-controlled units, outdoor parking, and specialized contractor spaces, there are options for a wide variety of storage situations.

Ready to find your perfect fit?

Explore our storage locations, compare available unit sizes and features, and find the storage solution that works best for you.

Please note: Storage unit sizes, types, amenities, and features vary by location. Not all facilities offer every size or storage option described in this guide. Unit dimensions are approximate, and availability is subject to change. For specific unit details, features, pricing, and current availability, please visit your preferred Storage Mall location's individual facility page.

Find a Location Near You: https://www.thestoragemall.com/storage-locations