Goliath 12×20 Garage Shed


The Goliath will have double garage doors that open up to eight feet wide and provide easy access for awkward items and machinery. A separate entry door can be used for access when the garage doors aren’t needed.

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The 12’x20’ Goliath Garage Shed’s Plan includes a complete material list, recommended tools, and step-by-step instruction manual. The plan covers the basic site preparation, foundation installations, floor, wall, and roof assemblies as well as blueprints for every section of the garage shed. The plan’s skill level is medium, and it can be downloaded in PDF for added convenience on the job site. Goliath’s plan is easy to read, and it utilizes a gable roof design. It also comes with excellent 2D/3D images of each section. The pictures include the overall dimensions, cut lumber sizes, plywood configurations, and rough openings. The plan also shows the builder how to construct the two windows, entry door, and garage doors, The option for buying and installing a stand lift door can be applied instead of building the garage doors. Additionally, the plan is engineered to help the average homeowner and DIY enthusiasts to build this structure themselves.


Free vs. Premium plan


Features Free Premium
Steps Count 13 25
Illustrations for Each Step
Print Ready
Step By Step Instructions
Full Materials and Cuttings List
Additional Illustrations
Additional Blueprints
Tools List
Fastening Elements List
Technical Support

12x20 gable garage shed


Shed overview


The 12’x20’ Goliath Garage Shed offers 240 sq. ft. of functional floor space. The floor is constructed with pressure-treated 2×8 lumber and 9/16” plywood for a heavy-duty platform that will support heavy machinery like riding lawn mowers, ATVs, snowmobiles, rototillers, small boats, and utility trailers. All of the construction materials used to build this structure are high-quality and durable, which provide years of low-maintenance and protection for its contents. The Goliath is a multifunctional structure that offers a variety of storage applications and uses for agriculture farmers, landscapers, carpenters, and the average homeowner. The double garage doors open up to eight feet wide and provide easy access for awkward items and machinery. A separate entry door can be used for access when the garage doors aren’t needed. It also has two windows and vents for fresh air flow. The Goliath is a solid structure that maximizes storage, and it can be painted or stained in a variety of colors.



12x20 gable garage shed plan


Premium 12×20 shed plan features


Siding blueprints

Drainage system instructions

Window instructions

No special skills needed

Exterior shutters instructions

Door ramp instructions

Doors instructions

Optimal layout for plywood


Build Your Own 12×20 Shed Now!


12x20 gable garage shed plan


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There are no shipping costs as the plan is available instantly by digital download in PDF format. You will have immediate access plus ongoing and smooth after sales support.

$19.99Add to cart

Delivery and refunds policy

Additional information






Garage shed

Area (sq. ft.)


Width (ft.)


Length (ft.)


Height (ft.)


Window size (in.)


Door size (in.)


Door type

Double door, Lift door

Plan version

Free, Premium


1. Do I need a permit?

A: In most local townships and municipalities, if a shed is less than 100sqft, you do not need a permit. For sheds more than 100sqft, it’s always best to go to your local town office and inquire about a building permit. 

2. How much it would cost me to build?

A: According to most building cost estimator programs, the average cost for materials to build a shed is about $22.85 per square foot. For example, an 8’x10’ shed equals 80sqft x $22.85 = $1,828.00.  

3. How much time will I need to build it?

A: The size of the shed plays a role in how long it will take to build it. An average 8’x10’ shed can be built in 3 to 4 days from start to finish.  

4. Do I need expensive tools or large equipment?

A: You do not need expensive tools, a typical miter and table saw will work just fine. You will also need basic hand tools, corded drill or cordless screw gun, standard 7 1/4’ skill saw, and a variety of garden tools for the foundation. 

5. Can I move my shed to another location?

A: You can move your shed to another location; however, a new foundation will need to be installed. Additionally, interior bracing, heavy-duty straps, and a small crane or front-end loader may be required to safely lift the structure to put it on a trailer or move it to another location on the property.