This step by step diy project is about diy 12×18 gable shed plans. I had a request for this large shed with a gable roof, so here are the free plans. This shed features double doors on the front, a side door and a window to let the light in. You can make lots of modifications to my plans so they suit your needs. Moreover, I have designed shed with many sizes so check them out, as well. 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.
Projects made from these plans
12×18 Gable Shed Plans
- A – 4 pieces of 6×6 lumber – 216″ long SKIDS
- B – 2 pieces of 2×6 lumber – 216″ long, 15 pieces – 141″long JOISTS
- C – 5 pieces of 3/4″ plywood – 48″x96″ long, 1 piece – 48″x48″ long, 2 pieces – 24″x48″ long, 1 piece – 48″x72″ long FLOOR
- D – 2 pieces of 2×4 lumber – 137″ long, 1 pieces – 144″ long, 10 pieces – 91 1/2″ long, 2 pieces – 48″ long, 4 pieces – 7 1/2″ long, 4 pieces – 25″ long, 4 pieces of 2×6 lumber – 35″ long SIDE WALL
- E – 1 piece of 2×4 lumber – 144″ long, 1 piece – 137″ long, 1 piece – 84 1/2″ long, 1 piece – 20 1/2″ long, 10 pieces – 91 1/2″ long, 2 pieces – 78 1/2″ long, 4 pieces – 7 1/2″ long, 2 pieces of 2×6 lumber – 35″ long SIDE WALL
- F – 2 pieces of 2×4 lumber – 209″ long, 1 piece – 216″ long, 17 pieces – 91 1/2″ long BACK WALL
- G – 1 piece of 2×4 lumber – 216″ long, 1 piece – 209″ long, 2 pieces – 60″ long, 13 pieces – 91 1/2″ long, 2 pieces – 78 1/2″ long, 8 pieces – 7 1/2″ long, 2 pieces of 2×6 lumber – 99″ long FRONT WALL
- E – 14 pieces of T1-11 – 48″x96″ long, 1 piece – 24″x96″ long, 1 piece – 16″x24″ long SIDING
- 2 pieces of 2×6 lumber – 18′
- 15 pieces of 2×6 lumber – 12′
- 4 pieces of 6×6 lumber – 18′
- 7 pieces of 3/4″ plywood – 48″x96″
- 5 pieces of 2×4 lumber – 18′
- 6 pieces of 2×4 lumber – 12′
- 60 pieces of 2×4 lumber – 8′
- 2 pieces of 2×6 lumber – 10′
- 3 pieces of 2×6 lumber – 8′
- 15 pieces of T1-11 – 48″x96″
- 1 piece of 1/2″ plywood – 48″x96″
- 8d nails, 2 1/2″ screws, 3 1/2″ screws
- 1 5/8″ screws
- rafter ties, joist hangers
- shed anchors
- wood filler, wood glue, stain/paint
- PART 1: 12×18 Shed Plans
- PART 2: 12×18 Shed Roof Plans
- PART 3: 12×18 Shed door and Trims Plans
How to build a 12×18 shed
The first step of the project is to build the floor for the 12×18 shed. Cut the joists from 2×6 or 2×8 lumber using a good saw. Align the beams, making sure the corners are square, drill pilot holes and insert 3 1/2″ screws to lock them together tightly. You can use joist hangers, as well.
Read the local building codes so you make sure these plans comply with your legal regulations!
After assembling the floor frame, you need to attach the 6×6 skids. Use metal connectors to secure the skids to the joists, after aligning them or toenail them.
Continue the project by attaching the 3/4″ plywood sheets to the floor frame. Leave no gaps between the floor sheets and secure them into place with 1 5/8″ screws, every 8″ along the joists.
Assemble the back wall from 2×4 lumber. Cut the studs and the plates at the right dimensions. Drill pilot holes through the top plates and insert 3 1/2″ screws into the studs, using the information from the diagram. Alternatively, you can use a framing gun and nails. Make sure the corners are square for a professional result.
As you can see in the plans, you need to fit 1/2″ plywood fillings to the double end studs.
Continue the project by assembling the front wall. As you can notice in the diagram, you need to leave enough space for the door opening. You can easily adjust the size of the door to suit your nails. As you can see in the plans, you need to install the jack studs to reinforce the structure of the shed. Use 2×6 lumber for the double header.
The double header for the door is made from 2×6 lumber filled with 1/2″ plywood. Cut the plywood to size and glue it to the headers with construction glue. In addition, drive a few screws or nails to lock everything tightly.
Build the side wall with window by following the instructions in the diagram. You should also notice the double plates that will add more rigidity to the walls and to the overall framing. You can adjust the size of the window opening to suit your needs.
Frame the opposite side wall, as shown in the diagram. You can frame a man door for an easy access to the shed. You can adjust the size of the door to suit your needs.
Lift the long walls and lay them to the floor of the shed. Align the edges with attention and use a spirit level to plumb the walls. Drill pilot holes through the bottom plates and insert 2 1/2″-3 1/2″ screws into the floor frame, every 8″. As you can notice in the plans, you need to secure the walls into place temporarily with braces.
Fit the side walls to the shed floor and lock them to the adjacent walls with 2 1/2″ screws. Make sure the corners are square and insert screws through the bottom plates into the floor, as well.
Build the exterior walls from 5/8″ T1-11 siding. As you can notice in the diagram, you need to make some cuts to the sheets so you cover the whole surface. Cut out a hole in the middle sheet so you can fit it around the window opening. Use 8d galvanized nails to secure the sheets to the wall frames. Align everything with attention and insert the nails every 8″ along the studs.
Make the cuts to the sheet that goes around the door opening. Align everything so the edges are flush and secure them into place with 8d nails.
Fit the siding sheets to the back of the shed. Leave no gaps between the sheets and align them to the top plates.
Attach the rest of the sheets to the front wall of the shed. Align the edges with attention and secure them to the wall studs with 8d nails or screws. Make sure you leave no gaps between the sheets for a professional result.
This 12×18 shed would make for the ideal workshop, if you like to build some projects in your free time. Moreover, this shed provides lots of storage space and you have a very easy access to the interior.
Make sure you check out the rest of the project, so you learn how to frame the roof and how to attach the door and the trims to the shed. In addition, I have lots of other shed projects on the site so I recommend you to browse through all alternatives before starting the building project.
This woodworking project was about 12×18 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.