12 x 24 Storage Shed Plan

Introduction

The 12’x24’ Lean-To Storage Shed plan is a simplified method for building sizable storage sheds. The plan incorporates a step by step instructional guide that is designed for beginners as well as experienced carpenters. A detailed material list includes information about the types of lumber for the shed and different construction materials needed from start to finish. It utilizes a solid foundation plan with a concrete footing and mortared brick support. The plan includes detailed pictures with measurements for lumber and shows illustrations in 3-D. It helps the builder to understand how the finished product should look and how all of the cut pieces of lumber fit together. A series of smaller steps will guide the builder step-by-step until the shed is complete. It provides different angles of all four sides of the shed as well as the roof and foundation. The plan does a good job at showing the builder how to make the barn-style doors, louvered vents, and door ramp. It also includes a simple, but low-cost and sturdy roof design.
The 12’x24’ Lean-To Storage Shed is 288 square feet of workable space that can be outfitted with a variety of storage applications. This amount of floor space can accommodate a number of recreational vehicles as well as a riding lawn mower and other outdoor equipment. The windowless design offers more wall space for shelving and storage closets that can be used to lock up harmful pesticides or chemicals and out of reach for children. The shed is built with long-lasting construction material and will provide years of endurance. It can be modified as a “drive-in/drive-out” system by duplicating the door design on the back wall. Architectural shingles or metal roofing can also, be used for the desired look and added performance. The shed can be stained or painted to match the exterior of any house
and is very low maintenance.

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 300 bricks for this step.
12x24 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 24′ 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°.
12x24 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 sixteen boards cut to 7′-3″ that will be studs, two boards cut to 9′-4″ that will be the bottom plates, one board cut to 24′ 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°.
12x24 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 nineteen boards cut to 8′-3″ that will be the studs and two boards cut to 24′ 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°.
12x24 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 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°.
12x24 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 twenty 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.
12x24 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 (see nodes F, G, H).
12x24 lean to storage shed door

Step 8 – Roof Sheathing Installation

8.1 You will need 345 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.
12x24 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. 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.
12x24 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.
12x24 lean to storage shed

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