12 x 16 Storage Shed Plan

Introduction

The 12’x16’ Lean-To Storage Shed plan is a step by step design for beginners or intermediate skill levels. It incorporates detailed sections with additional steps to build the shed. Every section includes 3-D drawings the accurately shows the measurements as well as illustrations of the finished product. The material list is very well thought out as it includes all of the required lumber, roofing materials, fasteners, hardware, foundation materials, and miscellaneous accessories.
The plan is engineered for the average homeowner with directions that are easy to understand. The illustrations provide excellent examples of how the finished section should look when it’s completed. The sections also include the correct nail and screw sizes for every application as well as the properly required door hinges. The shed plan features a square wooden louvered vent for increased air circulation that cuts down on condensation.
The plan shows how to build the doors as well as the access ramp, and it provides a solid foundation made of approximately 225 bricks on top of a concrete footing for years of durability and low maintenance.

The 12’x16’ Lean-To Storage Shed provides plenty of headroom with an 8-foot ceiling, and just as impressive is the 192 square feet of floor space. Everything from riding lawn mowers to 4-wheelers and snowmobiles can be easily driven into the shed using the provided access ramp and 5’x6’ open entry doors. There’s also lots of room for smaller machinery like push mowers, rototillers, chainsaws, weed eaters, and portable generators.
The louvered vent provides fresh air flow and an exhaust outlet for running a portable generator for lights and power tools or propane and kerosene heaters in cold weather conditions. The interior wall space also offers a lot of options for storage racks, shelving or accessories for hanging garden tools.

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 225 bricks for this step.
12x16 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 16′ that will be the rim joist and two boards cut to 11′-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°.
12x16 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 ten boards cut to 7′-3″ that will be studs, two boards cut to 5′-4″ that will be the bottom plates, one board cut to 16′ 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°.
12x16 lean to garden 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 thirteen boards cut to 8′-3″ that will be the studs and two boards cut to 16′ 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°.
12x16 lean to garden 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 ten boards cut to 7′-3″ that will be the studs and two boards cut to 11′-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°.
12x16 lean to garden shed side walls framing

Step 6 – Assemble The Roof Frame

6.1 Using 1 1/2″ x 5 1/2″ pressure-treated lumber, cut thirteen rafters 13′-3 1/4″ 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.
12x16 lean to storage shed roof framing

Step 7 – Assemble and Install Shed’s Door

7.1 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.

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

7.3 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″.

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

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

7.6 Assemble siding shields with 2″ galvanized nails.

7.7 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.
12x16 lean to storage shed door

Step 8 – Roof Sheathing Installation

8.1 You will need 235 Sq Ft of asphalt shingle roofing.

8.2 Add the metal drip edge to the fascias.

8.3 Cover the plywood with building paper.

8.4 Install asphalt shingle roofing using an industrial stapler.
12x16 lean to storage shed roof sheathing installation

Step 9 – Install Door Ramp

9.1 Assemble the 5 door ramp frames from pressure-treated lumber and secure with 3″ and 5″ wood screws (node K on page 28). 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″.

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

9.3 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.

9.4 Assemble siding shields with 2″ galvanized nails.
12x16 lean to storage shed door ramp installation

Step 10 – Decorate the Shed

Now that you’ve finished the shed, you are ready to paint it or finish with a wood stain or preservative.
12x16 lean to storage shed

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12x16 lean to storage shed plan

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