12×20 Shed | Your Guide to Buying or Building a 12 x 20 Storage Shed

12x20 Dormer Storage Shed

A 12×20 storage shed gives plenty of room for large riding mowers. But once it’s parked, there’s still lots of space for lots more storage.

The 12×20 shed is a really popular shed. Not without reason! They are a great size for basic storage needs. You can get your riding lawn mower out of the weather, and still have a great deal of room for tools and your Christmas decorations. Add a workbench, and you’ve got space for tinkering, hobbying, or repairing your gadgets.

But is 12×20 the right size for you? Before you buy or build a 12×20 shed and put it in your backyard, you want to be sure that it really is the right choice. For over 40 years, we’ve been guiding clients into sheds that are tailor-made to suit their needs. So we’ve prepared this guide to help you figure out whether a 12×20 shed is the size you need. As a bonus, we show you some design options for your new shed. And finally, we’ll take a look at how you can maximize your space in a 12×20 storage building.

Skim this post

  1. How much does a 12×20 shed cost?
  2. Video guide to 12×20 sheds
  3. What will fit into a 12×20 shed?
  4. Roof options
  5. How to optimize 240 Sq. Feet of storage space
  6. Photo Tour

How much does a 12×20 storage shed cost?

Obviously, the cost of your new storage shed depends on whether you build or buy. If you buy, you can choose an economy shed that is cheaply made. Higher quality sheds cost more. No surprises there!

Let’s look at a few numbers.

Our pricing for 12×20 storage buildings starts at about $4200 for a basic low-wall painted barn to $5100 for a cottage-style storage building with vinyl siding. High-wall barns cost some more than that. You can trick out these sheds with lots of options such as lofts, shelves, and ramps. What comes standard with these 12×20 storage buildings is a set of double doors, which give you room for your mower. Two windows are also standard in the cottages, which really make a difference in the amount of light you get inside.

We encourage you to shop around. You’ll soon find that there are cheaper 12×20 sheds out there. As with anything else, you have to decide what matters to you–the price you pay, or the value you get.

➜ Learn more by reading How Much Does a Shed Cost?

What will fit into a 12×20 storage building?

A 12×20 storage building will hold 2 zero-turn-radius lawn mowers, or 2 4-wheelers. In this way, it is like a 12×16. But in a 12×16, once you have two lawn mowers in, you don’t have much floor space left! A 12×20 storage building will give you nearly 50 sq. ft of additional floor space over a 12×16.

Add a wheelbarrow, fertilizer spreader, camping equipment, and you’ll still have room for some garden tools and shop tools. Add a loft, you can store your lighter things up high, such as Christmas decorations. This saves some people the risk of broken limbs trying to get up a rickety attic ladder!

Just remember: Don’t pack out your shed. If you get too much stuff on the floor, you’ll be tripping over it to get to your other stuff.

The scale models below give you an idea of what will fit in a shed. (Click photos to expand.) Also, notice the placement of the doors (marked in blue). We’ll look at this more in a bit, but doors make a big difference in how well you’re able to use your storage space.

12x20 Shed - Scale Model

One simple configuration is a set of double doors on the side. Mower and trailer can be at the end, and 2/3 of the shed is still available for storage.

12x20 Shed - Scale Model

A little crowded … but it’s possible! These models are exactly to scale.

12x20 Shed - Scale Model

With the double doors on the end, you can park your mower just inside the door. A side door gives you access to the rest of the building. You will still have room for a full size loft or workbench … or better, have your loft above your workbench.

12x20 Shed - Scale Model

Yes, that 1964½ Mustang can fit safely in a 12×20 storage shed between car shows. A garage door on the end (9×7) gives you easy access to drive in.

➜ Think a 12×16 shed might be closer to what you need? You can read more about that in A Guide to Buying or Building a 12×16 Shed.

12×20 Shed Roof Styles

You have lots of options for roof styles for a 12×20 garden shed. As you can see from the photos, they really do change the look of a shed.

The one practical change roof styles make is in storage space. The high-wall barn has more storage space than any other shed. Other than that, there’s not a lot of practical difference between different style roofs. But as you will see, there is a great deal of visual difference.

12x20 Shed - Hi-Wall Barn The high-wall barn maximizes storage space through a combination of high side walls, with a gambrel (half-octagon) roof that gives more loft storage than the gable (A-frame) roof. You can also see how the side door gives additional access, should you wish to park the mower inside the double doors on the end.

12x20 Shed, Painted with Classy Dormer

This roof style is called a dormer. You will notice the difference inside! It lets a lot more light in the shed. But perhaps the main feature is simply the classy look of the building.

12x20 Shed - Vinyl Low-Wall Barn

Low-Wall Barns such as this one have a classic barn look. They use fewer materials, so they are the least expensive to build. You get the most floor space per dollar. But, you lose some vertical storage space due to the low walls.

12x20 Shed - Painted, Transom Glass

This is the most classic of the shed looks — a basic gable or “A-frame” roof. Another roof feature of this shed is the 8″ overhang, which makes it look a bit more like your home. This 12×20 shed also features transom glass in the doors.


Optimizing storage space in your 12×20 shed

A 12×20 shed has 240 sq. feet of storage space. To get the most bang for your buck, there are two key ways of optimizing that space.

The first is what you might expect: shelving, lofts, and hooks. These options add a great deal of “square footage” of storage space without needing to get a larger shed.

For example, some shed owners will line the back wall with shelves. You can get up to 4 shelves nicely spaced. In a 12×20 storage shed, that expands your storage space by around 70-80 sq ft!

12x20 Shed -- Shelving

4 shelves add a lot of beautifully organized storage space at a fraction of the cost. This photo is not a 12×20 storage shed, but it gives the idea.

The second space optimizer is more surprising: door placement. It sounds strange at first, but where you place the doors in your shed really makes a difference in how much usable storage space you have. For best door placement design, consider a few questions.

  • What will go in your building?
  • With that, where do you want to store it?
  • Finally, what the best way will be of accessing everything?

Parking the riding mower just inside the double doors works well for many of our clients. But you don’t want to climb over it to get inside, so you’ll need a separate walk-through door on the side.

We’ve got more sheds on display only a click away. Dream on …

Photo Tour – 12×20 Storage Building Ideas

Here are a few more 12×20 shed photos to help you get going.

12x20 Shed, Vinyl, Transom Glass12×20 Vinyl Clad Shed. This shed has the unusual feature of 2 sets of double doors. Both of them have transom glass, which add both class and light. A cupola gives it a “tip-top” look.

12x20 Shed - Vinyl Dormer Nook Porch

This gorgeous little 12×20 shed has a nook porch just for sitting and relaxing in the garden. It also features a dormer with a half-round window.

12x20 Shed - Vinyl Cottage

This 12×20 wood storage shed is vinyl-clad. It is some of the most basic, durable storage you can get. Maintenance is extremely low on the vinyl.

12x20 Shed, Vinyl Dormer

An A-dormer on a vinyl-clad 12×20 wood shed. The 11-lite walk-through door on the side looks great, floods the interior with light, and gives better access to your things.

12x20 Shed Dormer w/ smiling customer

It’s hard to resist that smile! This is a vinyl-sided version of the 12×20 Dormer Shed.

A 12×20 shed is a significant investment. It’s worth some time to make sure you get a shed, custom-built, just for you.

Our design consultants will walk with you through the complete design process. No extra cost!

That concludes our tour of 12×20 sheds. Thank you for joining us! We hope you found this helpful.