This step by step diy project is about 12×20 gambrel shed with side porch plans. This shed features a gambrel roof and a side porch. In addition, you have an easy access to the interior using the double side doors or the front man door. You will also have plenty of light inside the shed, because it comes with 3 windows. You can use this shed for storage, or you can easily make a workshop for your creative endeavors. Make sure you read the local codes and make adjustments if necessary. Take a look over the rest of my woodworking plans, if you want to get more building inspiration.
When buying the lumber, you should select the planks with great care, making sure they are straight and without any visible flaws (cracks, knots, twists, decay). Investing in cedar or other weather resistant lumber is a good idea, as it will pay off on the long run. Use a spirit level to plumb and align the components, before inserting the galvanized screws, otherwise the project won’t have a symmetrical look. If you have all the materials and tools required for the project, you could get the job done in about a day. See all my Premium Plans HERE.
Projects made from these plans
12×20 Barn Shed with Side Porch – Free DIY Plans
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- A – 2 pieces of 2×6 lumber – 144″ long, 10 pieces – 141″ long FLOOR FRAME
- A – 2 pieces of 2×6 lumber – 96″ long, 7 pieces – 141″ long FLOOR FRAME
- B – 4 pieces of 4×4 lumber – 144″ long, 4 pieces – 96″ long SKIDS
- C – 5 pieces of 4×4 lumber – 92 1/2″ long, 1 piece – 143 1/2″ long, 1 piece – 47 1/2″ long POSTS
- C – 9 pieces of 5/8″x5 1/2″ lumber – 144″ long DECKING
- D – 5 pieces of 3/4″ plywood – 48″x96″ long, 2 pieces – 48″x48″ long FLOOR
- E – 2 pieces of 2×4 lumber – 96″ long, 1 piece – 89″ long, 8 pieces – 91 1/2″ long, 3 pieces – 37″ long, 2 pieces – 36″ long, 3 pieces – 7 1/2″ long, 4 pieces of 2×6 lumber – 27″ long FRONT WALL
- E – 3 pieces of 2×4 lumber – 48″ long, 5 pieces – 91 1/2″ long FRONT WALL
- G – 2 pieces f 2×4 lumber – 144″ long, 2 pieces – 56″ long, 11 pieces – 91 1/2″ long, 6 pieces – 37″ long, 10 pieces – 7 1/2″ long, 4 pieces – 36″ long, 8 pieces of 2×6 lumber – 27″ long, 2 pieces – 35″ long FRONT WALL
- F – 1 piece of 2×4 lumber – 144″ long, 1 piece – 137″ long, 3 pieces – 91 1/2″ long, 1 pieces – 78 1/2″ long, 6 pieces – 7 1/2″ long, 2 pieces of 2×6 lumber – 75″ long SIDE WALL
- H – 2 pieces of 2×4 lumber – 89″ long, 1 piece – 96″ long, 7 pieces – 91 1/2″ long SIDE WALL
- I – 1 piece of 2×4 lumber – 233″ long, 2 pieces – 240″ long, 18 pieces – 91 1/2″ long BACK WALL
- I – 15 pieces of 5/8″ T1-11 siding sheets – 48″x96″ long, 1 piece – 48″x16″ long SIDING SHEETS
- 19 pieces of 2×6 lumber – 12′
- 8 pieces of 2×6 lumber – 8′
- 5 pieces of 4×4 lumber – 12′
- 10 pieces of 4×4 lumber – 8′
- 9 pieces of 5/8″x5 1/2″ lumber – 12′
- 6 pieces of 3/4″ plywood – 4’x8′
- 80 pieces of 2×4 lumber – 8′
- 4 pieces of 2×4 lumber – 12′
- 3 pieces of 2×4 lumber – 20′
- 15 pieces of 5/8″ T1-11 siding sheets – 4’x8′
- 3 1/2″ screws
- 2 1/2″ screws
- 1 5/8″ screws
- post base
- rafter ties
- wood glue, stain/paint, wood filler
- 6d nails
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- PART 1: 12×20 Gambrel Shed with Side Porch Plans
- PART 2: 12×20 Gambrel Roof Shed Plans
Building a 12×20 garden shed
The first step of the project is to build the floor frame. Drill pilot holes through the perimeter joists and insert 3 1/2″ screws into the perpendicular ones. Place the joists every 16″ on center and make sure the diagonals are equal.
Fit 4×4 skids under the floor frame. The skids will lift the floor from the ground to protect it from the elements. Invest in weather resistant because that will be much more durable than regular construction wood. Use rafter ties to secure the skids under the frame and lock them together with rafter ties.
Next, you need to build the smaller section for the floor frame. Use 2×6 lumber, as well. Drill pilot holes through the rim joists and use 3 1/2″ screws to assemble everything tightly.
Fit the 4×4 skids under the floor frame, as well.
Assemble the floor for the shed by drilling pilot holes and inserting 2 1/2″ screws.
Use 3/4″ plywood sheets for the floor of the shed. Lay the sheets to the floor making sure you align the edges with attention and leave no gaps between them. Drill pilot holes through the sheets, every 8″ along the framing and insert 1 5/8″ screws.
Continue the project by making the section walls for the storage shed with porch. Use 2×4 lumber for the plates and for the studs. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs every 16″ on center. Frame a window opening so you can fit a 24″x36″ window. Use 2×6 lumber for the headers (sandwhich a piece of 1/2″ plywood between the headers and add glue and insert screws for extra bond).
Build the other section for the front wall of the barn shed, using the same techniques described above. Notice the double plates that will add strength to the shed structure. In addition, frame the front door for the shed, as shown in the diagram. I’ve also added 2 windows to the front of the shed for more light inside of the structure.
Build the third section for the front wall, as shown in the diagram.
Use 2×4 lumber for the other side of the shed, as well.
Frame side wall with the opening for the double doors. Use the same techniques described above. Use 2×6 lumber for the double header. Fit a piece of 1/2″ plywood between the headers and add glue before inserting the 2 1/2″ screws, from both sides.
Build the back wall for the shed in one or two smaller sections. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs every 16″ on center.
After assembling the wall frames you need to lay them on the floor of the shed. Align the edges flush and plumb the walls with a spirit level. Drill pilot holes through the bottom plates and insert 3 1/2″ screws into the floor. Make sure the corners are square and lock the adjacent walls together tightly with 3 1/2″ screws.
Use 5/8″ T1-11 siding sheets for the exterior of the shed. Align the edges flush then insert 6d nails, every 8″ along the framing.
Fit the siding sheets to the side of the shed, as well. Make cuts around the door opening. Insert 6d nails to lock the panels into place tightly.
Attach the siding sheets to the front of the shed. Make the cuts around the window openings and around the door opening.
Fit the siding sheets to the other side of the storage gambrel shed.
Last but not least, attach the boards to the back of the garden barn shed.
This is the main structure of the barn shed. as you can see in the diagram, everything is locked together tightly. The framing is done with 2x4s, but you can switch to 2x6s if you want to install insulation between the studs and use it as an workshop, even during the cold winter days.
Use 5/8″x5 1/2″ decking boards for the front porch. Align the edges with attention and leave no gaps between the decking boards. Drill pilot holes and insert 1 5/8″ screws to lock them to the joists.
Use 4×4 lumber for the porch posts. Cut the posts at 92 1/2″ and secure them to the deck with connectors. Plumb the posts vertically and lock them into place tightly.
Use 4×4 lumber for the plates. Make notches to one end of the plates, as shown in the diagram. Use a circular saw to make parallel cuts inside the marked areas and clean the recess with sandpaper and a chisel.
Fit the plates to the top of the posts. Align the edges, drill pilot holes and insert 7″ screws to lock everything tightly. Make sure the corners are square and leave no gaps.
You need to take a look over PART 2 of the project, so I can show you how to build the gambrel roof and how to make the shed doors. In addition, I will show you how to assemble and install the railings to the shed porch.
Don’t forget that I have tons of free shed plans with step by step instructions. You can check all the plans HERE. I have lots of woodworking plans that cover everything from furniture up to playhouses. See the full list of plans HERE.
This woodworking project was about 12×20 gambrel shed with side porch plans. If you want to see more outdoor plans, check out the rest of our step by step projects and follow the instructions to obtain a professional result.