This step by step woodworking project is about free 12×20 garden shed plans. I have designed this large shed with a gable roof so you can have a basic workshop in your backyard. In addition, due to the easy access to the interior, you can use this shed for storing an ATV or your motorbikes. See my other DIY projects HERE.
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.
Made from this plan
12×20 Shed Plans Free
- A – 5 pieces of 4×4 lumber – 240″ long SKIDS
- B – 2 pieces of 2×6 lumber – 240″ long, 16 pieces – 141″long FLOOR FRAME
- C – 5 pieces of 3/4″ plywood – 48″x96″ long, 5 pieces – 48″x48″ long FLOOR
- D – 2 pieces of 2×4 lumber – 97 1/2″ long, 1 piece – 240″ long, 1 piece – 233″ long, 13 pieces – 90″ long, 2 pieces – 48″ long, 4 pieces – 39″ long, 4 pieces – 10″ long, 2 pieces – 76 1/2″ long, 5 pieces – 9 1/2″ long, 5 pieces – 37 1/2″ long SIDE WALL
- E – 2 pieces of 2×4 lumber – 240″ long, 1 piece – 233″ long, 13 pieces – 90″ long SIDE WALL
- F – 1 piece of 2×4 lumber – 144″ long, 2 pieces – 31″ long, 1 piece – 137″ long, 6 pieces – 90″ long, 2 pieces – 86″ long, 2 pieces of 2×6 lumber – 75″ long FRONT WALL
- G – 2 pieces of 2×4 lumber – 137″ long, 1 piece – 144″ long, 7 pieces – 90″ long BACK WALL
- H – 16 pieces of T1-11 siding – 48″x84 1/2″ long SIDING
- 5 pieces of 4×4 lumber – 20′
- 16 pieces of 2×6 lumber – 12′
- 2 pieces of 2×6 lumber – 20′
- 8 pieces of 3/4″ plywood – 4’x8′
- 6 pieces of 2×4 lumber – 20′
- 6 pieces of 2×4 lumber – 12′
- 16 pieces of T1-11 siding – 4’x8′
- 2 pieces of 2×6 lumber – 8′
- 51 pieces of 2×4 lumber – 8′
- 1 5/8″ screws, 2 1/2″ screws, 3 1/2″ screws
- wood filler , wood glue, stain/paint
- Safety gloves, glasses
- Miter saw, jigsaw
- Chalk line, tape measure, spirit level, carpentry pencil
- Drill machinery and drill bits
- One Day
How to build a 12×20 shed
The first step of the project is to frame the floor for the 12×20 shed. Cut the joists from 2×6 or 2×8 lumber. Drill pilot holes through the rim joists and insert 3 1/2″ screws into the perpendicular components. Make sure the corners are square and align the edges flush.
Lay 4×4 skids on a level surface and then attach the floor frame. Make sure you place the skids equally spaced, so they can support the weight of the structure properly. Use rafter ties to lock the skids to the floor frame. In addition, drill pilot holes through the joists and insert 3 1/2″ screws into the skids.
Attach the 3/4′ plywood sheets to the floor frame. Align the edges with attention, drill pilot holes and insert 1 5/8″ screws every 8″ along the joists. Leave no gaps between the sheets for a professional result.
Assemble the front wall for the shed from 2×4 lumber. Make sure you use 2×6 lumber for the double header. After cutting all the components at the right dimensions, you need to assemble them together tightly. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs.
You can adjust the size of the double door opening to suit your needs. In addition, you can make the necessarily modifications for fitting even a garage door.
Building the double headers is a straight forward job. Drill pilot holes through the beams and insert 2 1/2″ screws. Add glue to the joints and add a 1/2″ plywood piece for strength.
Continue the project by framing the wall with the small door and with the window. Cut all the components from 2×4 lumber, as shown in the free plans. Drill pilot holes through the plates and insert 3 1/2″ screws into the plates. Align the edges flush, make sure the corners are square and then insert the screws.
You can easily adjust the size of the door and of the window, so it suits your needs.
Frame the opposite side wall using the same techniques described above.
Last but not least, frame the back wall for the 12×20 shed.
Fit the wall frames to the floor of the shed. Align the edges flush, drill pilot holes through the bottom plates and insert 3 1/2″ screws into the floor. Make sure you lock the adjacent walls together tightly. Drill pilot holes and insert 2 1/2″ screws to lock everything together tightly.
Attach the T1-11 siding sheets to the wall frames of the shed. Align the edges with attention and use 6-8d nails to lock them into place tightly. Leave no gaps between the sheets for a professional result.
Attach the T1-11 siding to the wall with window, as well. Make a few cuts around the door opening and around the window opening. Smooth the edges with sandpaper, before locking them into place with 6-8d nails. Insert the nails every 8″ along the framing.
Fit the siding sheets to the front wall as well. As you can notice in the diagram, you need to cut the sheets so you can install them around the opening for the double doors.
Attach the siding to the back wall, in the same manner described above. Use 6-8d nails.
Check out PART 2 and PART 3 of the project to learn how to build the gable roof and the doors for this 12×20 backyard shed. You can easily use this shed as a workshop or for storing your bikes and other motorized toys.
If you want to build the gable roof for this large storage shed, you should check out PART 2 of the project. In PART 3 you will see how to build the double doors. If you like my project, don’t forget to SHARE it on Facebook and Pinterest.
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