12×20 Gable Shed Plans – PDF Download

This step by step woodworking project is about 12×20 gable shed plans. If you need a new workshop for your hobbies or just a place to store tools, bikes and other toys, this gable shed with a 6:12 pitch and 12 ft x 20 ft base, is the ideal choice. Read the local codes before starting the project, so you comply with the requirements. See my other DIY projects HERE. PDF downloadable plans with premium features in the Store. This is a guest post from MyOutdoorPlans.com

This 12×20 gable shed is not just practical but also adds a great aesthetic to your backyard with its classic 6:12 pitch roof. The spacious 12 ft by 20 ft base offers plenty of room for a fully functional workshop or storage area, making it perfect for all your tools, bikes, and outdoor gear. With detailed plans and easy-to-follow instructions, you’ll be able to customize the shed to fit your specific needs, whether it’s adding shelves, workbenches, or extra windows for natural light. This project is a fantastic way to enhance your outdoor space and create a dedicated spot for your hobbies.

We recommend you to invest in the best materials you could afford. Therefore, you should buy weather-resistant lumber, such as pine or cedar. Always take accurate measurements before adjusting the size of the components at the proper size. Drill pilot holes trough the components before inserting the wood screws, to prevent the wood from splitting. My plans come with a full cut / shopping list and they are PDF Download and Print friendly.

Made from this plan

12×20 Gable Shed – Free DIY Plans

Building-a-12×20-shed-with-gable-roof

Cut and Shopping Lists

A – 8 pieces of 4×4 lumber – 10′ long SKIDS
B – 2 piece of 2×6 lumber – 20′ long, 16 pieces – 141” long FLOOR FRAME
C – 6 pieces of ¾” plywood – 4’x8’ long, 3 pieces – 4’x4’ long FLOOR SHEETS
D – 2 pieces of 2×4 lumber – 20 ½” long, 1 piece – 137” long, 1 piece – 144” long, 6 pieces – 91
½” long, 2 pieces – 78 ½” long, 8 pieces – 7 ½” long, 2 pieces of 2×6 lumber – 99” long FRONT
WALL
E – 1 piece of 2×4 lumber – 184″ long, 1 piece – 24” long, 1 piece – 233” long, 1 piece – 240”
long, 17 pieces – 91 ½” long, 5 pieces – 25” long, 9 pieces – 7 ½” long, 2 pieces – 48” long, 2
pieces – 78 ½” long, 2 pieces of 2×6 lumber – 51” long, 2 pieces – 35” long SIDE WALL WITH
DOOR
E – 2 pieces of 2×4 lumber – 240″ long, 1 piece – 233” long, 18 pieces – 91 ½” long SIDE WALL
F – 2 pieces of 2×4 lumber – 137” long, 1 piece – 144″ long, 10 pieces – 91 ½” long BACK WALL
G – 16 pieces of 2×6 lumber – 144” long, 40 pieces of 2×4 lumber – 96” long, 16 pieces – 30 ½”
long, 20 pieces – 8 3/8” long TRUSSES
H – 15 pieces of 5/8” T1-11 siding – 4’x8’ long, 1 piece – 48”x16” long, 4 pieces – 48”x27 7/8”
long, 2 pieces – 48”x39 7/8” long SIDING
I – 4 pieces of ½” plywood – 4’x8’ long, 4 pieces – 48”x92” long, 2 pieces – 48”x76” long ROOF
J – 4 pieces of 1×6 lumber – 97 1/8” long, 2 pieces – 124” long, 2 pieces – 140” long ROOF TRIMS
K – 400 sq ft of tar paper, 400 sq ft of asphalt shingles ROOFING
L – 2 pieces of 2×4 lumber – 80” long, 1 piece – 103” long DOOR JAMBS
M – 2 pieces of 2×4 lumber – 73“ long, 2 pieces – 48“ long, 1 piece – 41“ long, 1 piece of T1-11
siding – 4’x8’ long 2xDOOR
N – 2 pieces of 2×4 lumber – 80” long, 1 piece – 39” long DOOR JAMBS
O – 2 pieces of 2×4 lumber – 73“ long, 2 pieces – 32“ long, 1 piece – 25“ long, 1 piece of T1-11
siding – 32”x8’ long DOOR
M – 8 pieces of 1×4 lumber – 96“ long, 2 pieces – 48” long, 2 pieces – 55” long TRIMS

Unlock Shopping and Cut Lists

Tools

Miter saw
Circular saw
Drill machinery, drill bits
Safety gloves, glasses
Chalk line, tape measure, spirit level, carpentry pencil

Time

One week

12×20 Gable Shed – DIY Plans

Assembling-the-floor-frame

The first step of the project is to build the floor frame for the 12×20 storage shed. Use 2×6 lumber for the joists and cut them, as shown in the diagram. Drill pilot holes through the long beams and insert 3 1/2″ screws into the perpendicular joists. Place the joists every 16″ on center. Check if the corners are square and align the edges flush.

Use joist hangers and 1 1/2″ structural screws, if you want even more rigidity to the floor frame.

Fitting-the-skids

Use 4×4 lumber for the skids. Place the skids under the floor frame. Use 2 rafter ties to secure each skids to the floor frame using 1 1/2″ structural screws. Select the location for the shed and remove the vegetation layer.

Level the surface thoroughly, so you can set the shed into place tightly. Use a spirit level to make sure the floor frame is horizontal. Measure the diagonals for the floor frame and make adjustments until they are perfectly level. Compact a 4″ layer of gravel under the shed frame, so you help with water drainage and protect the components from excessive moisture.

Floor-sheets

Use 3/4″ tongue and groove plywood sheets. Invest in pressure treated plywood, because the floor sheets will be exposed to moisture. Cut the sheets at the dimensions shown in the diagram and in the cut list. Leave no gaps between the sheets and align the edges flush. Drill pilot holes and insert 1 5/8″ screws every 8″ along the framing, to secure the sheets into place.

Back-wall-frame

Use 2×4 lumber for the back wall frame. Cut the components at the right dimensions, as shown in the diagram. Drill pilot holes through the plates and insert 3 1/2″ screws to assemble the wall frame. Make sure the corners are square and align the edges flush. Place the studs every 16″ on center.

Front-wall-frame

Next, assemble the front wall frame for the large garden storage shed. As you can see in the diagram, you need to leave a 96″ opening so you can install double 4 ft doors. Use 2×6 lumber for the double header. Fit a piece of 1/2″ plywood between the 2x6s so you can make it 3 1/2″ thick. You can adjust the size of the opening and make it suit your needs. You can even install a garage door, if you want.

The studs go every 16″ on center. Make sure the corners are square. Place double studs at both ends of the wall.

Double-header—assembly

Details for the double header. Fit 1/2″ plywood blockings between the double studs.

Side-wall-with-windows

Build the side wall with windows and access door, using the info in the diagram. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs 16″ on center, as shown in the plans.

Notice the double 2×4 headers with 1/2″ plywood in the middle. Add glue to the joints and insert 2 1/2″ screws from both sides to assemble the headers. You can adjust the size of the windows to suit your needs. In addition, frame the door opening. You can install a prehung door (make adjustments to the opening if needed) or you can build a simple door using my plans.

Notice the double studs placed at both ends of the walls. Place 1/2″ plywood pieces between the double studs.

Plain-side-wall-frame

Build the opposite site wall using the same techniques described above. Place the studs every 16″ on center. Notice the double studs placed at both ends of the wall frame.

Assembling-a-12×20-shed

Fit the wall frames to the floor of the shed. Align the edges flush and plumb them vertically with a spirit level. Drill pilot holes and insert 3 1/2″ screws through the bottom plates into the floor frame. Check if the corners are square and lock the adjacent wall together tightly with 3 1/2″ screws.

Fitting the siding sheets

Side-wall-panels-with-window

Use T1-11 siding sheets for the exterior of the shed. Align the edges to the top and side edges. Insert 6d nails every 8″ along the wall framing, to lock them into place tightly. Leave no gaps between the sheets. Use a saw to make the cut outs for the windows and for the door.

Side-wall-panels

Attach the panels to the opposite side of the wall. Leave no gaps between the sheets and insert 8d nails to lock them into place, every 8″ along the framing.

12×20 Shed Plans – interior

This shed is sturdy and in the same offers a lot of space for you to store your belongings. In addition, you can use this shed for your hobbies, as it features a nice door to the side for access and two large windows so you get light inside. In addition, the 8 ft garage door to the front is ideal for having access inside with large objects. You can use this tutorial to make a cool ramp for this shed.

12×20-Shed-Plans—overall-dimensions

This is one of the best HowToSpecialist.com shed plans and designs. Also, you can take a look over my other large shed plans 16×24. In addition, I have plans for a 20×20 gable shed.

12×20 Shed Plans

Make sure you take a look over PART 2 of the project, so you learn how to build the gable roof. If you want to get this plan with full Cut list and full Shopping list, in one single PDF file, please take a look over the GET PDF PLANS button bellow.

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