10 x 20 Storage Shed Plan


This 10x20 storage shed is the same size as a single-car garage, but it'll be easier to find your stuff because it has a generous window on each side and a double-door entry. The doors are wide enough to pull in motorized lawn and garden equipment like a riding lawnmower or small tractor. The ventilation vents in the gable ends keeps the air cleaner year-round and the ramp into the shed simplifies loading and unloading.
Besides storage, there's enough room in the shed to make it a multifunctional space by combining it with room for hobbies, especially with its ample daylight. There's enough space on the roof to accommodate solar panels to generate electricity to use inside this spacious shed.

Materials you’ll need

  • Concrete
  • Bricks
  • Pressure-Treated Lumber
  • Pressure-Treated Board
  • Plywood
  • Building paper
  • Asphalt shingles
  • Wood siding boards
  • Door hinges
  • Door Pulls
  • Surface Bolts
  • Galvanized nails
  • Wood screws

Step 1 – Foundation Preparation

1.1 Clear the area where you want to build the shed and layout for the foundation. Use the below illustration as a guide.

1.2 For the foundation, dig the trenches at least 1′ wide and 1′ deep.

1.3 Fill the trenches to ground level with concrete and let cure, or harden. Since curing times vary between brands, read the packaging for recommended curing times.

1.4 Once the concrete has cured, use standard-sized bricks and lay them across the foundation. You will need roughly 250 bricks for this step.

10x20 storage shed foundation preparation

Step 2 – Framing The Floor

2.1 Assemble the frame using treated lumber. You will need 14 boards to use as a floor joists.

2.2 Secure the beams together with wood screws.

2.3 Take a few minutes to check the corners to make sure they are 90°.

10x20 storage shed floor framing

Step 3 – Assemble Front Wall Frame

3.1 Using treated lumber, put the front wall frame together using the drawing below for guidance.

3.2 Use flat head Phillips wood screws to connect the beams.

3.3 Use the square to check the corners to verify that each is 90°.

10x20 storage shed front wall framing

Step 4 – Assemble Back Wall Frame

4.1 Using pressure-treated lumber, construct the back wall frame. The drawing below provides the construction detail.

4.2 Connect the beams with wood screws.

4.3 Be sure to check the corners using a square to make sure they are 90°.

10x20 storage shed back wall framing

Step 5 – Assemble Left and Right Wall Frames

5.1 Using treated lumber, construct the side wall frames using the drawing below as a guide.

5.2 Join all the beams with flat head Phillips wood screws.

5.3 Check the corners as you go and when you complete the walls to make sure they are 90°.

10x20 storage shed side walls framing

Step 6 – Assemble the Roof Frame

6.1 Using pressure-treated lumber, cut 34 rafters according to the angle dimensions.

6.2 Using treated lumber, cut 15 collar ties according to the dimensions.

6.3 Using pressure-treated board, cut the ridge board according to the illustration below.

6.4 Use flat head Phillips wood screws to connect the beams.

10x20 storage shed roof framing

Step 7 – Assemble and Install Shed Doors

7.1 Build the door frames for the shed using treated lumber and secure with Phillips flat head wood screws.

7.2 Cut the plywood sheet into two pieces for the doors.

7.3 Use treated lumber for the door trim and fasten with Phillips flat head wood screws. You will need boards to make the trim.

7.4 Use pressure-treated lumber to cut and install a starter course.

7.5 For the exterior siding on the door, use wood siding board as shown in the image below.

7.6 Assemble siding shields with galvanized nails.

7.7 Install door hinges using Phillips flat head wood screws. Finish the door installation by attaching surface bolts and door pulls.

10x20 storage shed door

Step 8 – Roof Sheathing Installation

8.1 You will need 300 square feet of the asphalt shingle roofing of your choice.

8.2 Add the metal drip edge to the fascias.

8.3 Cover the plywood with building paper (roofing felt).

8.4 Install asphalt shingle roofing using an industrial stapler or roofing nails.

10x20 storage shed roof sheathing

Step 9 – Decorate the Shed

Now that you’ve finished this shed, you can paint, stain or use a wood preservative to finish the exterior.
10x20 storage shed

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10x20 storage shed plan

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