Home 8x20 8×20 Gambrel Shed Plans

8×20 Gambrel Shed Plans

by Ovidiu


This step by step diy project is about 8×20 gambrel shed plans. If you need extra storage space in your backyard, this gambrel shed will provide it with generosity. This shed features 2×4 framing with 6′ high side walls and a 4′ access door to the front. Make sure you read the local codes and make adjustments if necessary. This shed can also be used as a playhouse or as a bike shed. 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




8×20 Gambrel Shed Plans




Cut & Shopping Lists

  • A – 3 pieces of 4×4 lumber – 120″ long SKIDS
  • B – 2 pieces of 2×6 lumber – 240″ long, 16 pieces – 93″ long FLOOR FRAME
  • C – 4 pieces of 3/4″ plywood – 48″x96″ long, 2 pieces – 48″x48″ long FLOOR
  • D – 2 pieces of 2×4 lumber – 240″ long, 18 pieces – 55 1/2″ long 2xSIDE WALL
  • E – 2 pieces of 2×4 lumber – 13″ long, 1 piece – 63″ long, 1 piece – 89″ long, 2 pieces – 55 1/2″ long, 5 pieces – 87″ long BACK WALL
  • F – 2 pieces of 2×4 lumber – 13″ long, 1 piece – 63″ long, 2 pieces – 20 1/2″ long, 2 pieces – 55 1/2″ long, 2 pieces – 78 1/2″ long, 4 pieces – 87″ long, 2 pieces of 2×6 lumber – 51″ long FRONT WALL

  • 6 pieces of 4×4 lumber – 10′
  • 2 pieces of 2×6 lumber – 20′
  • 16 pieces of 2×6 lumber – 8′
  • 5 pieces of 3/4″ plywood – 4’x8′
  • 4 pieces of 2×4 lumber – 20′
  • 20 pieces of 2×4 lumber – 12′
  • 11 pieces of 2×4 lumber – 8′
  • 3 1/2″ screws
  • rafter ties
  • wood glue, stain/paint, wood filler


 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Safety Gloves, Safety Glasses


One week




It’s that simple to build a 8×20 barn shed – Video!



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Building a 8×20 garden shed



First of all, you have to assemble the floor frame. Cut the components from 2×6 lumber at the dimensions shown in the plans. Drill pilot holes through the 96″ long joists and insert 3 1/2″ screws into the perpendicular components. Make sure the corners are square and align the edges with attention before inserting the screws. Place the joists every 16″ on center.

Fitting the skids

Fitting the skids

Next, fit the 4×4 skids under the floor frame. Use rafter ties to secure the skids to the floor frame. The skids will lift the floor frame from the ground, and it will protect the components from the elements.

Fitting the floor sheets - 8x20 shed for garden

Fitting the floor sheets – 8×20 shed for garden

Next, attach the 3/4″ plywood panels to the floor frame. Align the edges and leave no gaps between the panels for a professional result. Drill pilot holes and insert 1 5/8″ screws every 8″ along the joists. I recommend you to invest in tongue and groove plywood because there will be no gaps between the sheets.



Build the side wall for the shed using the information from the plans. Start by cutting all the components from 2×4 lumber. Drill pilot holes through the plates and insert 3 1/2″ galvanized screws into the studs. Make sure you place the place the studs spaced as shown in the plans, otherwise you won’t be able to install the siding panels. Place the studs every 16″ on center.

Fitting the side walls to the floor of the shed

Fitting the side walls to the floor of the shed

Lay the wall frames to the floor of the shed. Use a spirit level to plumb the walls and align the edges flush. Drill pilot holes through the bottom plates and insert 3 1/2″ screws into the floor. Use temporarily braces to lock the side walls vertically till you add the front and back wall frames.



Build the front wall for the 8×20 barn shed. I have added a large 4′ door to the front of the shed. Use 2×4 lumber for the studs and plates. Use 2×6 lumber for the double header (fit a 1/2″ plywood between the 2×6 headers).



Assemble the back wall for the shed. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Align the edges flush and make sure the corners are square.

Assembling the frame of the shed

Assembling the frame of the shed

After assembling the wall frames, you need to assemble the shed structure. Lay the front and the back walls to the floor of the shed. Align the edges flush, drill pilot holes through the bottom plates and insert 3 1/2″ screws. Make sure the corners are right angled.

How to build a 8x20 gambrel shed

How to build a 8×20 gambrel shed

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 a simple door. This storage shed is ideal if you need storage space in your backyard.



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.

If you want to get this plan as a PDF file that comes with full Cut and Shopping lists, please check out the GET PDF PLANS button bellow.



This woodworking project was about 8×20 shed 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.







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