12×20 Gambrel Shed Plans

This step by step diy project is about 12×20 gambrel shed plans. I have designed this large storage shed with a gambrel roof, so you can organize your tools. Furthermore, if you want to set up a small hobby workshop, this project might suit your needs and be friendly with your pocket. 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

Building a large gambrel shed

  

12×20 Gambrel Shed Plans

Building-a-12×20-barn-shed

Cut & Shopping Lists

• A – 4 pieces of 4×4 lumber – 240″ long SKIDS
• B – 2 pieces of 2×8 lumber – 240″ long, 16 pieces – 141″long FLOOR FRAME
• C – 5 pieces of 3/4″ plywood – 48″x96″ long, 5 pieces – 48″x48″ long FLOORING
• D – 1 piece of 2×4 lumber – 240″ long, 1 piece – 233″ long, 1 piece – 26 1/4″ long, 1 piece – 181 3/4″ long,14 pieces – 91 1/2″ long, 2 pieces – 78 1/2″ long, 6 pieces – 7 1/2″ long, 3 pieces – 36″ long, 3 pieces – 37″ long, 2 pieces of 2×6 lumber – 35″ long, 4 pieces – 39″ long SIDE WALL
• E – 1 piece of 2×4 lumber – 144″ long, 1 piece – 137″ long, 2 pieces – 31″ long, 6 pieces – 91 1/2″ long, 2 pieces – 87 1/2″ long, 2 pieces of 2×6 lumber – 75″ long FRONT WALL
• F – 2 pieces of 2×4 lumber – 137″ long, 1 piece – 144″ long, 7 pieces – 91 1/2″ long BACK WALL
• G – 2 pieces of 2×4 lumber – 240″ long, 1 piece – 233″ long, 13 pieces – 91 1/2″ long SIDE WALL
• H – 6 pieces of 2×8 lumber – 144″ long LOFT JOISTS
• I – 10 pieces of T1-11 siding – 48″x96″ long, 5 pieces – 48″x94 1/2″ long, 1 piece – 48″x7″ long SIDING

• 4 pieces of 4×4 lumber – 20′
• 16 pieces of 2×8 lumber – 12′
• 2 pieces of 2×8 lumber – 20′
• 8 pieces of 3/4″ plywood – 4’x8′
• 6 pieces of 2×4 lumber – 20
• 5 pieces of 2×4 lumber – 12′
• 52 pieces of 2×4 lumber – 8′
• 5 pieces of 2×6 lumber – 8′
• 15 pieces of T1-11 siding – 4’x8′
• 1/2″ plywood
• skid ties
• 8d nails, 2 1/2″ screws, 3 1/2″ screws
• wood filler , wood glue, stain/paint

Tools

 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses

Time

 One week

Related

• PART 1: 12×20 Gambrel Shed Plans
• PART 2: 12×20 Gambrel Shed Roof Plans
• PART 3: 12×20 Gambrel Shed Doors Plans
• 12×20 Gambrel Cabin Plans

How to build a 12×20 gambrel shed

Building-the-floor-frame-12×20-gambrel-shed

The first step of the project is to build the floor for the shed from 2×8 lumber. Cut the joists at the right dimensions and then lay them on a level surface. Make sure the corners are square and then align the edges flush. Drill pilot holes through the rim joists and insert 3 1/2″ screws into the perpendicular components.

Smart Tip: You need to read the local codes so you make sure the plans you are going to use comply with the legal requirements.

Fitting the skids

Read the local building codes and then select the appropriate location for the large gambrel shed. Level the surface thoroughly and then set the 4×4 skids, spacing them evenly. Lay the floor frame and align the edges flush. Use rafter ties to lock the frame to the skids

Floor sheets

Fit the 3/4″ plywood sheets to the floor frame. Align the edges flush and make sure there are no gaps between the sheets. Insert 1 5/8″ screws every 8″ along the joists, so you lock the sheets into place tightly.

Building wall frames

Side-wall-with-window-frame

Continue the large gambrel shed project by assembling the side wall with windows. Use 2×6 lumber for the double headers. Sandwich a piece of 1/2″ plywood between the 2×6 beams and lock them together with 2 1/2″ screws.

Use 2×4 lumber for the rest of the components (plates and studs). Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs every 24″ on center and make sure the corners are square. You can adjust the size of the window and door openings to suit your needs.

Side-wall-frame—12×20-shed

Assembling the opposite wall of the storage shed is a straight forward job. After cutting all the components to the right dimensions, you need to drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs every 24″ on center, for a professional result. As you can easily notice in the diagram, you need to place double studs at both ends of the walls. Fit 1/2″ plywood between the double studs.

Front-wall-frame

Cut the components from 2×4 lumber. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Use 2×6 lumber for the double header. You can adjust the size of the door opening to suit your needs.

Back-wall-frame

Frame the back wall for the storage shed. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Place the studs every 24″ on center. Make sure the corners are square.

Assembling the frame of the shed

Fit the wall frames to the floor of the shed and align the edges flush. Drill pilot holes through the bottom plates and insert 3 1/2″ screws into the floor. Plumb the wall frames with a spirit level for a professional result. Moreover, you need to lock the adjacent wall together by drilling pilot holes and inserting 3 1/2″ screws.

Fitting the siding sheets

Back wall – Siding

Attach T1-11 siding sheets to the back of the gambrel shed. As you can easily notice in the diagram, you need to inset the sheets about 1 1/2″ from the top plates. Use 6-8d nails to secure the sheets along the framing, every 8″. Leave no gaps between the sheets for a professional result.

Fitting the panels to the front wall

Fit the T1-11 siding sheets to the front of the shed, as well. Make the cuts so you can fit the sheets around the door opening. Align the edges flush and use 6-8d nails to lock the sheets into place tightly. Leave no gaps between the sheets for a professional result.

Side wall – Siding

Fit the sheets to the plain side of the shed. Align the edges to the top of the plates and then secure them into place with 6-8d nails. Insert the nails every 8″ along the framing. Leave no gaps between the sheets for a professional result.

Side wall with window – Siding

Fit the siding panels to the opposite side of the shed, as well. Make the cuts so you can fit the sheets around the window and door openings.

Finishing touches

12×20 Gambrel Shed Plans

You should check PART 2 and PART 3 of the project, so you learn how to build the gambrel roof and the doors. Fitting the trims is also important, as they will give the shed character and an unique look.

12×20 Gambrel Shed Plans – Side view

This large barn shed is ideal for a large property, as you can not only store a lot of items, but you can also use it as a workshop. Moreover, you can build a simple loft to the shed, so you can enhance the storage space even more.

12×20 Shed gambrel Plans – dimensions

Building a 12×20 gambrel shed with double front doors, a side door, and a side window will likely cost you between $3,500 and $5,000, depending on the materials and finishes you select. The gambrel roof, combined with multiple doors and a window, adds to the cost, but it’s all worth it for the added space, accessibility, and natural light. This investment provides you with a spacious, versatile shed that’s both functional and visually appealing.

How to build a 12×20 barn shed

Expect to spend about 5 to 7 weekends constructing your 12×20 gambrel shed with double front doors, a side door, and a side window. The complexity of the gambrel roof and the installation of additional doors and windows will take some extra time, but the process is straightforward if approached systematically. By the time you’re done, you’ll have a well-built shed that offers easy access, plenty of storage, and a touch of charm.

If you want to get PREMIUM PLANS for this project, in a PDF format, please press GET PDF PLANS button bellow. Thank you for the support.

This woodworking project was about 12×20 gambrel 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.

- EXPLORE MORE IDEAS FOR -