16×20 Shed Plans

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This step by step diy project is about 16×20 gable shed plans. I have designed this 16×20 storage shed, so you can add extra space in your backyard for storing tools, furniture and other items. This shed is easy to build and it has a gable roof. The double shed doors will help you have a great access to the shed. Take a look over the rest of my woodworking plans, if you want to get more building inspiration. Remember that you need to select the site for the shed with attention and that you have to comply with a few legal regulations.

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




16×20 Shed Plans

Building a 16x20 shed

Building a 16×20 shed


  • A – 6 pieces of 4×4 lumber – 240″ long SKIDS
  • B – 2 pieces of 2×6 lumber – 240″ long, 16 pieces – 189″ long FLOOR FRAME
  • C – 8 pieces of 3/4″ plywood – 48″x96″ long, 4 pieces – 48″x48″ long FLOOR
  • D – 1 piece of 2×4 lumber – 192″ long, 1 piece – 185″ long, 2 pieces – 56 1/2″ long, 8 pieces – 91 1/2″ long, 2 pieces – 86″ long, 2 pieces of 2×6 lumber – 75″ long FRONT WALL
  • E – 2 pieces of 2×4 lumber – 240″ long, 1 piece – 233″ long, 15 pieces – 91 1/2″ long, 6 pieces – 32 1/2″ long, 4 pieces – 36″ long, 6 pieces – 12″ long, 8 pieces of 2×6 lumber – 39″ long SIDE WALL WITH WINDOW
  • F – 2 piece of 2×4 lumber – 240″ long, 1 piece – 233″ long, 13 pieces – 91 1/2″ long SIDE WALL
  • G – 2 piece of 2×4 lumber – 185″ long, 1 piece – 192″ long, 9 pieces – 91 1/2″ long BACK WALL
  • H – 18 pieces of T1-11 5/8″ siding – 48″x96″ long SIDING

 One day



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How to build a 16×20 shed floor and wall frames

Building the floor frame

Building the floor frame

First of all, you need to build the frame for the floor. Cut the components at the right dimensions from 2×6 lumber. Align the edges flush and make sure the corners are square. Drill pilot holes through the rim joists and insert 3 1/2″ screws into the joists. Place the joists every 16″ on center for a professional result.

Fitting the skids

Fitting the skids

Attach 4×4 skids to the floor frame. Place the skids equally spaced and use screws or hardware to lock them together tightly. The skids will lift the floor from the ground and this will protect the components from moisture.

Fitting the floor sheets

Fitting the floor sheets

Attach 3/4″ plywood sheets to the floor frame of the shed. Cut the sheets to the dimensions, show in the plans and in the cut list. Align the edges flush, making sure you leave no gaps between the components. Insert 1 5/8″ screws every 8″ through the sheets into the joists.

Side wall - Frame

Side wall – Frame

Assemble the plain side wall frames from 2×4 lumber. Make sure the corners are square and align the edges flush for a neat result. Place the studs every 24″ on center for a neat result. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs.

Side wll with window - Frame

Side wall with window – Frame

Build the opposite side wall for the 16×20 shed. Cut the components from 2×4 lumber and the double headers from 2×6 lumber. Fit 1/2″ plywood between the double headers. Drill pilot holes and insert 2 1/2″ screws to lock the headers. You can adjust the size of the windows, so it suit your needs. The double windows placed on one side of the shed will let enough light inside the shed.

Front wall - Frame

Front wall – Frame

Frame the front wall for the shed using 2×4 lumber for the studs and plates, while the double header requires 2×6 lumber. Drill pilot holes through the plates and insert 3 1/2″ screws into the studs. Toe-nail the double header to the front wall. Make sure the corners are square and align the edges flush. You can easily adjust the size of the 6′ door opening to suit your needs.

Back wall - Frame

Back wall – Frame

Frame the back wall for the 16×20 shed, using the same techniques described above. You should use 3 1/2″ screws or 16d nails to lock the joints together tightly. Place the studs every 24″ on center and make sure the corners are square.

Assembling the shed frame

Assembling the shed frame

Fit the side, front and the back walls frames to the shed floor, as shown in the plans. Make sure the corners are square and then align the edges flush. Drill pilot holes through the bottom plates and insert 3 1/2″ screws to lock the adjacent walls together tightly. Use a spirit level to plumb the walls. Lock the adjacent wall frames together, by drilling pilot holes and insert 3 1/2″ screws.

Front wall - siding

Front wall – siding

Fit the T1-11 siding sheets to the front of the storage shed. Mark the cut lines on the sheets and then get the job done with a circular saw. Attach the sheets to the front of the shed and align the edges flush. Insert 6-8d nails to secure the sheets to the framing, every 8″.

Side wall - Siding

Side wall – Siding

Fit the T1-11 siding sheets to the side walls. Align the edges with attention and leave no gaps between the sheets. Insert 6-8d nails every 8″ along the framing.

Side wall with window - Siding

Side wall with window – Siding

Fit the T1-11 siding sheets to the side wall with windows. Fit the sheets into place and then make the window openings.

Back wall - Siding

Back wall – Siding

Attach 5/8″ T1-11 siding to the back wall of the shed. Align the edges flush with the top of the top plates and then secure the panels into place with 6-8d nails. Leave no gaps between the sheets for a professional result.

16x20 Shed Plans

16×20 Shed Plans

You need to check out PART 2 and PART 3 of the shed, so you learn how to build the roof for the shelter. In addition, you need to make the double doors and attach the trims.

16x20 Shed Plans Free

16×20 Shed Plans Free

This is a simple project you should be able to build in a few weeks without much effort. Don’t forget to take a look over PART 2 and PART 3 to learn how to build the roof for the shed, as well as how to frame the double front doors.



This woodworking project was about 16×20 gable 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.




Kids                Garden                Animals                 Planter

Car                Indoor               Furniture               Shed


  1. Paul at - Reply

    Great job thank you for sharing it with us.

    • Ovidiu at - Reply

      You’re welcome. Looking forward to seeing your projects!

  2. Andy Ray at - Reply

    Is the materials list for the entire project or will I have to get the materials lits for the two associated plans to complete the project?

    • Ovidiu at - Reply

      Each part of the project comes with its own materials list (frame, roof, door nd trims)

  3. Nati at - Reply

    Very helpful.Thanks o lot.

    • Ovidiu at - Reply

      You’re welcome.

  4. Gary at - Reply

    How do I d/l the plans?

  5. Marc at - Reply

    Thanks for posting these plans! I was dreaming of building a big shed in the back yard almost exactly like this (with the gable trusses spanning on 16ft, etc) and when I stumbled upon this post, I was very happy to find clear, detailed isometric pictures with enough explanation. I’m starting to build mine in 2 days, all materials are ordered, I can’t wait! Thank you so much again for your wonderful post, it’s super helpful! Out of curiosity, I wonder why there aren’t many plans of sheds made out of gable trusses. Everything I see is W trusses or queen’s posts trusses and for smaller sheds like 12ft or less, I see simple trusses (just a triangle). Do you know why there aren’t many gable truss sheds? Are gable trusses more dangerous for live loads like 2 feet of snow accumulation? Thanks!

  6. antonio jones at - Reply

    Hi thanks for sharing the plans! I have a quick question..what do the measurements of the 2×6 floor joists indicate exm 13 3/4 and 14 1/2?

    • Ovidiu at - Reply

      The distance between the joists.

  7. antonio jones at - Reply

    Are all the wall 24″ on center?

    • Ovidiu at - Reply

      Yes, studs are placed every 24″ on center.

  8. antonio jones at - Reply

    Also is there a 2×6 on top of all the walls?

    • Ovidiu at - Reply

      There are no 2x6s on top of the walls.

      • antonio jones at -

        i was referring to the top plate on the walls, i see on certain sides its cut 3 1/2 shorter or longer

      • Ovidiu at -

        The double plates are made of 2×4, as well.


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