This step by step diy project is about 12×24 lean to shed plans. I have designed a really large shed with a lean to roof, so you can store garden tools, outdoor furniture and other large items. This shed features double front doors and two windows. Make sure you comply with the local codes before staring the project. 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.
Projects made from these plans
12×24 Lean to Shed Plans
- A – 10 pieces of 4×4 lumber – 12′ long SKIDS
- B – 2 pieces of 2×6 lumber – 12′ long, 10 pieces – 141″ long 2xFLOOR
- C – 7 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long FLOORING
- D – 2 pieces of 2×4 lumber – 137″ long, 1 piece – 144 long, 10 pieces – 79 1/2″ long 2xSIDE WALL
- E – 2 pieces of 2×4 lumber – 12′ long, 11 pieces – 79 1/2″ long 2xBACK WALL
- F – 2 pieces of 2×4 lumber – 93″ long, 9 pieces – 79 1/2″ long, 3 pieces – 16″ long, 2 pieces – 32″ long, 4 pieces – 27″ long, 2 pieces – 24 1/2″ long 2xFRONT WALL
- F – 1 piece of 2×4 lumber – 102″ long, 2 pieces – 3″long, 2 pieces – 74″ long, 2 pieces – 79 1/2″ long, 2 pieces of 2×6 lumber – 99″ long 2xFRONT WALL
- F – 2 pieces of 2×4 lumber – 140 1/2″ long, 1 piece – 144″ long, 2 pieces – 68 1/2″ long TOP PLATES
- G – 2 pieces of 2×4 lumber – 12 ft, 11 pieces – 21″ long 2xTOP BACK WALL FRAME
- H – 13 pieces of 5/8″ T1-11 – 48″x84″ long, 2 pieces – 48″x8 1/2″ long, 6 pieces – 48″x24″ long SIDING PANELS
- 10 pieces of 4×4 lumber – 12′
- 2 pieces of 2×6 lumber – 12′
- 20 pieces of 2×6 lumber – 12′
- 2 pieces of 2×6 lumber – 10′
- 9 pieces of 3/4″ plywood – 4’x8′
- 80 pieces of 2×4 lumber – 8′
- 13 pieces of 2×4 lumber – 12′
- 20 pieces of T1-11 – 48″x96″
- 1 5/8″ screws
- 8d nails, 2 1/2″ screws, 3 1/2″ screws
- wood filler , wood glue, stain/paint
- rafter ties (to secure the skids)
- PART 1: 12×24 Shed Plans
- PART 2: 12×24 Shed Roof Plans
Building a 12×24 lean to shed
The first step of the diy outdoor project is to build the floor frame for the 12×24 shed. Cut the joists from 2×6 lumber at the dimensions shown in the diagram. Lay the joists on a level surface and then align the edges flush. Make sure the corners are square and then drill pilot holes through the rim joists. Insert 3 1/2″ screws to lock the components together tightly. Use at least 2 screws for each joint.
The floor frame will be built from 2 sections, so you need to make 2 identical frames, as shown in the plans.
Select the location for the shed and remove the vegetation layer. Level the surface thoroughly and compact a 2″ layer of gravel. The gravel will keep the moisture away from the joists.
Next, fit 4×4 skids under the floor frame. Place the skids equally spaced and then lock them to the frame with rafter ties. Lock the two frames together tightly with screws. Make sure the edges are aligned and leave no gasps between the frames.
Fit the 3/4″ plywood sheets to the floor of the shed. Align the edges flush and leave no gaps between them. Insert 1 5/8″ screws to lock the sheets along the joists, every 8″.
Frame the front wall using the information from the diagram. Cut the components from 2×4 lumber at the dimensions shown in the plans. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Use 2×6 lumber for the double header and fit 1/2″ plywood between the beams. Drill pilot holes and insert 2 1/2″ screws to assemble the double header. You can adjust the size of the door opening to suit your needs.
The front wall will have 3 sections. This is the middle section. I use several section frames for the front and back walls so you can keep the costs down and because I’m aware 24 ft long 2x4s aren’t available everywhere. In addition, it will be a lot easier to manage the wall frames by sections instead of a complete 24 ft long wall.
These are the left and right sections for the front wall. As you can see in the plans, I have added 24″x32″ openings for windows. You can make adjustments to the window openings to suit your needs. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs every 16″ on center. Use double studs at one end of the wall frames (fit pieces of 1/2″ plywood between the double studs).
Build the side walls for the shed from 2×4 lumber. Cut all the components at the right dimensions and the lay them on a level surface. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs every 16″ on center. Measure the diagonals for the wall frame and check if the corners are square.
The next step of the project is to build the 2 identical sections for the back wall. Use the same techniques described above.
Fit the wall frames to the floor of the shed. Align the edges with attention and plumb the walls with a spirit level. Drill pilot holes through the bottom plates and insert 3 1/2″ screws into the floor. Joint the adjacent walls together tightly with 3 1/2″ screws, after drilling pilot holes.
Afterwards, make sure the corners are square, and attach the 2×4 top plates to the top of the front wand back walls (ignore the drawing for the back wall, you actually need to fit the double plate so that it’s centered over the joint between the 2 partitions).
Build the top frame for the back wall from 2×4 lumber. You also need 2 identical sections for the wall frame.
Fit the frames to the top of the back wall. Align the edges with attention, drill pilot holes and insert 3 1/2″ screws to lock it into place tightly. Make sure the edges are flush and check if there are any gaps between the frames.
Fit the T1-11 siding sheets to the sides of the shed. Make the cuts so you can fit the sheets into place Insert 6-8d nails, every 8″ along the framing.
Fit the T1-11 siding sheets to the front of the shed. Make the cuts so you can fit the sheets around the door openings. Insert 6-8d nails, every 8″ along the framing.
Fit the panels to the back of the shed, as well. Leave no gaps between the sheets and align everything neatly. Insert 6-8d nails every 8″ along the framing.
This is a large shed with a lean to roof. The roof has a 2:12 pitch. You can easily modify the shed, by adding the double doors and windows to the tall wall.
I have lots of other shed projects on the site so I recommend you to browse through all alternatives before starting the building project. See all my shed projects HERE. Moreover, check out PART 2 of the shed, so you learn how to build the roof and the double front doors.
This woodworking project was about 12×24 lean to shed plans free. 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.