14 x 20 Storage Shed Plan

Introduction

The 14’x20’ Lean-To Storage Shed plan is a basic step by step instructional guide that is designed for beginners or those with intermediate carpentry skill levels. The plan includes a complete list of materials with the type of lumber required as well as information on the foundation, roofing applications, miscellaneous fasteners, and hardware. The plan also includes a design for a durable foundation that is cost-effective and lasts for decades, it clearly explains each phase of construction with beautifully designed 3-D illustrations. The drawings provide a great visual of the section with step-by-step instructions on how to cut the pieces and put them together. It shows the builder how to assemble the simple roof design, barn-style doors, louvered vent, door ramp, sub-floor, and all four walls of the shed. The plan offers flexibility for those who might want to paint it a different color, add architectural shingles or even install a standing seam metal roof.
The 14’x20’ Lean-To Storage Shed offers 280sqft of interior floor space with a comfortable ceiling height of 8-feet. The concrete footing and mortared brick design allow this shed to easily store 4 to 6 ATVs or snowmobiles. Still leaving plenty of room for a riding lawnmower, numerous garden tools, and more. The construction design is solid with materials like pressure treated lumber and plywood.
The shed provides lots of room for shelving applications, large chest-drawer tool boxes, air compressors, power tools, generators, and large outdoor machinery. It can even be modified into a complete woodworking shop with large table saws, lathes, drill presses, radial arm saws, large planers and still, have plenty of room for a separate painting and staining station. The possibilities are endless. The shed is even large enough to run a dividing wall, creating a storage area, and the perfect place for a man-cave.

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 foot wide and 1 foot 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 270 bricks for this step.
14x20 lean to storage shed foundation preparation

Step 2 – Framing The Floor

2.1 Assemble the frame using 1 1/2″ x 7 1/4″ pressure-treated lumber. You will need two boards cut to 20′ that will be the rim joist and two boards cut to 13′-9″ that will be the joist.

2.2 Secure the beams with 8×5″ wood screws.

2.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
14x20 lean to storage shed floor framing

Step 3 – Assemble Front Wall Frame

3.1 Using 1 1/2″ x 3 1/2″ and 3 1/2″ x 3 1/2″ pressure-treated lumber, construct front wall frame using the drawing below as a reference. You will need fourteen boards cut to 7′-3″ that will be studs, two boards cut to 7′-4″ that will be the bottom plates, one board cut to 20′ that will be the top plate, one board cut to 5′-4″ that will be the door header, three boards cut to 1′-1″ that will be cripple studs.

3.2 Connect the beams with 2×3″ and 2×5″wood screws.

3.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
14x20 lean to storage shed front wall framing

Step 4 – Assemble Back Wall Frame

4.1 Using 1 1/2″ x 3 1/2″ and 3 1/2″ x 3 1/2″ pressure-treated lumber, construct back wall frame using the drawing below as a reference. You will need sixteen boards cut to 8′-3″ that will be the studs and two boards cut to 20′ that will be the top and bottom plates.

4.2 Connect the beams with 2×3″ wood screws.

4.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
14x20 lean to storage shed back wall framing

Step 5 – Assemble Side Wall Frames

5.1 Using 1 1/2″ x 3 1/2″ pressure-treated lumber, construct side wall frame using the drawing below as a reference. You will need eleven boards cut to 7′-3″ that will be
the studs and two boards cut to 13′-5″ that will be the top and bottom plates.

5.2 Connect the beams with 2×3″ wood screws.

5.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
14x20 lean to storage shed side walls framing

Step 6 – Assemble The Roof Frame

6.1 Using 1 1/2″ x 5 1/2″ pressure-treated lumber, cut fourteen rafters 15′-3 3/4″ long according to the dimensions in drawing below. Cut the recesses in each beam for splicing connection with wall frames.

6.2 Connect the beams with a top frame with the help of 3″ wood screws.
14x20 lean to storage shed roof framing

Step 7 – Install Plywood for the Roof

7.1 Cut sheets of 9/16″ plywood for the roof sheathing using the drawing below as a guide. You will need four 8′ x 4′ sheets, four 7′-7 3/4″ x 4′ sheets and four 4′-11 1/4″ x 4′ sheets.

7.2 Secure the plywood with 2″ wood screws.
14x20 lean to storage plywood for roofing

Step 8 – Assemble and Install Shed Doors

8.1 Build the door frames for the shed using 1 1/2″ x 3 1/2″ pressure-treated lumber and secure with 5″ wood screws. You will need two boards cut to 5′-11 3/4″ that will be the vertical girts and two boards cut to 2′-3/4″ that will be the horizontal girts.

8.2 Prepare the 9/16″ plywood sheet with dimensions 2′-7 3/4″ x 5′-11 3/4″ for the doors according to the drawing.

8.3 Use 2 1/2″ x 3/4″ pressure-treated lumber for the door trim and fasten with 2″ wood screws. You will need two boards cut to 2′-2 3/4″ and two boards cut to 5′-11 3/4″.

8.4 Using 1/4″ x 3/4″ pressure-treated lumber, cut and install a starter course 2′-2 3/4″ long.

8.5 For the exterior siding on the door, use 1/2″ x 6″ wood siding boards and the illustration below as a reference.

8.6 Assemble siding shields with 2″ galvanized nails.

8.7 Install three 3″ door hinges using 6×1″ wood screws. Finish the installation of the doors by attaching 4″ surface bolts and 6″ door pulls.
14x20 lean to storage shed door

Step 9 – Roof Sheathing Installation

9.1 You will need 330 Sq Ft of asphalt shingle roofing.

9.2 Add the metal drip edge to the fascias.

9.3 Cover the plywood with building paper.

9.4 Install asphalt shingle roofing using an industrial stapler.
14x20 lean to storage shed roof sheathing installation

Step 10 – Assemble and Install Door Ramp

10.1 Assemble the 5 door ramp frames from pressure-treated lumber and secure with 3″ and 5″ wood screws. For each frame you will need one 1 1/2″ x 1 1/2″ board cut to 1′-8″; one 1 1/2″ x 2 1/2″ board cut to 3′-3/4″ and one 1 1/2″ x 3 1/2″ board cut to 6 1/4″.

10.2 Connect and secure all frames using one 1 1/2″ x 2 1/2″ board 5′-9″ long and 3″ wood screws.

10.3 Cut the 9/16″ plywood sheet with dimensions 3′-3/4″ x 5′-9″ for the top plane and two sheets with dimensions 9 1/4″ x 2′-9 1/2″ for the sides.

10.4 Assemble siding shields with 2″ galvanized nails.
14x20 lean to storage shed door ramp installation

Step 11 – Decorate the Shed

Now that you’ve finished the shed, you are ready to paint it or finish with a wood stain or preservative.
14x20 lean to storage shed

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14x20 lean to storage shed plan

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