What Size Shed Do I Need? How to Avoid the #1 Mistake When Buying a Storage Shed

How to Calculate the Perfect Shed Size Based on My Storage Needs

Before you start comparing dimensions, it helps to slow down and actually think through what you're storing and where. A few minutes of planning here saves you from a shed that's stuffed to the rafters within a year, or one that's oversized and half-empty. Here's where to start.

Make a list of everything you want to store.

Start by writing out exactly what's going in the shed, and break it into categories based on size or how often you'll use each item. It's easy to say you need room for "holiday decor" or "lawn equipment" without stopping to picture what that actually means. That single tub of decorations you imagined might turn out to be three totes and a couple of garbage bags once you really look. Getting specific here gives you a realistic sense of what exactly you have to store—and how much space you’ll need to do it.

Measure your largest item.

Once you know what you want to store, you need to consider what is going to take up the most space. For the most part, items like decorations and lawn tools can be tucked away on shelves and into stacked boxes, more efficiently using your space. However, if you plan on storing a large item like a lawn mower or wheelbarrow, there’s less room to maneuver.

You need to make sure you have a space big enough for that exact item. Measure your largest item’s length, width, and height, accounting for all parts of the item, including the handles and attachments.

Consider how and when you’ll access everything.

There’s a difference between storage capacity and usable storage. Sure, you can pack a storage shed from top to bottom, but it’s completely useless when you find you need something you’ve buried in the back. Take the time to consider what you are storing and how readily you’ll need access to it.

For example, maybe you want to store your lawn mower, holiday decorations, and camping gear. You’ll likely need more immediate access to your lawn equipment but will only need to access the seasonal items on occasion. This will help you know how much room you need to be able to move around the shed and what kind of layout will best suit your needs.

Measure your available yard space.

No matter how much interior space your dream shed offers, it still has to fit your yard. Measure the space you plan on placing your storage shed, keeping in mind your property lines, fences, nearby trees, and other obstacles. Pay attention to which direction the door will swing open, too. A shed tucked too close to a fence can make loading and unloading a hassle.

Check local zoning and permit requirements.

Shed regulations vary more than most homeowners expect, and they're worth checking before you decide on a particular size. In Lafayette, Indiana, for example, sheds larger than 120 square feet require a building permit and a solid, permanent foundation. In Logansport, Indiana, storage sheds can't sit closer than five feet to a side or rear property line.

HOAs also often add their own rules on top of that, sometimes requiring the shed's exterior to match the home's siding or roofing for a cohesive look. A quick call to your local zoning or HOA office can save you from a costly redo later.

How to Determine the Right Shed Size for My Backyard

Once you have an understanding of what exactly you plan on using your storage shed for and the legal requirements, you can start looking at the different size options to find the best fit for you.

Small Storage Sheds

Small storage sheds are often the choice of anyone who needs mild storage for outdoor equipment or appliances.

They can range from 6x8 to 8x10 feet in size and typically work well for storing:

• Garden tools
• Push mower
• Weed trimmer
• Leaf blower
• Bikes
• Yard toys
• Patio cushions
• Hand tools

Medium Storage Sheds

Medium storage sheds give enough room to store larger equipment or to double as a small workshop.

With sizes ranging from 10x12 to 12x16 feet, these sheds are ideal for:

• Riding lawn mowers
• Snow blowers
• Multiple bikes
• Patio furniture
• Shelving
• Workbenches
• Camping equipment
• Seasonal decorations

Large Storage Sheds

If you’re looking for a shed that can be used more as a small, functional structure, you may want a large storage shed.

These sheds range from 12x16 to 24x32 feet and can be used as storage for large items or as a secondary functional building. Common uses include:

• ATVs
• Larger trailers
• Workshop space
• Living space (home office, work studio, home gym, etc.)
• Extensive shelving
• Landscaping equipment
• Farm or hobby equipment
• Compact tractors, depending on attachments

If 24x32 feet is still too small for your needs, it’s time to consider a portable garage instead. These buildings give the space and benefits of a garage without the hassle of building a permanent building on your property.

Once you've landed on a general size, don't stop at the bare minimum. A good rule of thumb is to take whatever size you've calculated based on your current needs and add about 25% more space on top. Storage needs have a way of creeping up—a new mower, a few more bins, a bike the kids outgrew—and that buffer keeps your shed from feeling cramped again just a year or two after you buy it.

Other Factors that Affect Your Ideal Shed Size

Storage sheds aren’t a one-size-fits-all solution like most big box stores will try to have you believe. Square footage is a starting point, but it's far from the whole picture. A shed can have the right footprint on paper and still fall short in daily use if these details get overlooked.

If you're planning to roll a mower or ATV in and out regularly, for example, your door width and placement can have a major impact. A shed with plenty of square footage but a narrow door can still leave you wrestling equipment through a tight opening every time. Double doors or a wider single door make a real difference for anything on wheels.

Vertical clearance matters too, especially for taller equipment. If you're hoping to add loft storage overhead for seasonal items, you'll need enough vertical space to make that loft actually usable rather than just a few inches of crawl space.

These are exactly the details where a standard, big-box store shed tends to fall short. The sizes and layouts are built for the average buyer, not your specific equipment or yard. A quality, custom-built option lets you fit the shed to your actual needs—the right door for what you're rolling in, the ceiling height your loft requires, and a layout designed around how you'll really use the space.

FAQs