12 x 24 Garden Shed Plan

Introduction

The 12’x24’ Lean-To Garden Shed plan utilizes a step by step process to construct the shed. It’s designed in a way that the average homeowner can easily follow and understand. The plan explains the material list with information about the type of lumber and plywood to uses as well as hardware, fasteners, doors, shutters, drainage system, and other components. It has a detailed design for the roofing and foundation applications that will stand the test of time. The plan is divided into sections that start with the site preparation and continues with each phase until the final product is built. It includes 3-D illustrations with pictures of the required size to cut the lumber, how it should look when it’s completed, and precise layout design. It helps the average homeowner with the tools they should use as well as how to build the doors, windows, louvered vents, and shutters. The plan offers a low-cost design that has a lot of interior storage space and room for modifications. Additionally, it’s a very good visual guide that simplifies the construction process.
The 12’x24’ Lean-To Garden Shed is perfect for larger real estate properties that have acres of outdoor gardens, plants, and shrubs. It’s also the ideal storage solution for those who own apple orchards, orange groves, blueberries, and other farming products. The 288 square feet of interior floor space can accommodate small machinery, ATVs, garden supplies, and more. The construction of the shed is solid with plywood and pressure treated lumber that ensures a firm structure. The shed can be built in any weather climate, and it utilizes a duel louvered venting system for added airflow and condensation reduction. It can also be painted or stained any color and offers years of durability.

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 garden 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 garden 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 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 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 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 frames using the drawing below as a reference. You will need two boards cut to 11″ that will be the cripple studs, two boards cut to 2′-9″ and eight boards cut to 7′-3″ that will be the studs, two boards cut to 3′-4″ that will be the window header and rough sill 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°.

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.

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 six 3″ door hinges using 6×1″ wood screws. Finish the installation of the doors by attaching 4″ surface bolts and 6″ door pulls.
12x24 lean to garden 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 garden shed roof sheathing installation

Step 9 – Assemble and 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 garden shed door ramp installation

Step 10 – Window Installation for Side Walls

It is necessary to prepare 2 windows.

10.1 Using 1 1/2″ x 2 1/2″ pressure-treated lumber, assemble the outer frame for the window as shown in the drawing below. You will need two boards cut to 3′-1″ that will be the vertical girts and two boards cut to 3′-4″ that will be the horizontal girts. Additionally, add vertical 2′-11 1/2″ long and horizontal 3′-1″ long supports using 3/4″ x 1″ lumber and cut the recesses for the window hinges.

10.2 Use 1 1/2″ x 1 1/2″ pressure-treated material to make the inner frame and secure with 3″ wood screws. You will need two boards cut to 2′-9 3/4″ that will be the vertical girts and two boards cut to 3′-3/4″ that will be the horizontal girts. Mill a recess for the glass panes and for the hinges.

10.3 Use 1 1/4″ x 1 1/2″ pressure-treated material to make the inner frame supports and secure with 3″ wood screws. You will need two boards cut to 2′-9 3/4″ and mill a recess for interconnection.

10.4 Prepare and install glass into inner frame groove and fasten it by window beading from four sides. Use 1/2″ galvanized nails.

10.5 Install two hinges 3″ with 6×1″ wood screws and assemble the window. Install a lock on the inner side of the window.
12x24 lean to garden shed window

Step 11 – Assemble and Install Window Shutters

It is necessary to prepare 4 windows shutters.

11.1 Assemble frames using 3/4″ x 1 1/2″ pressure-treated lumber and secure with 3″ wood screws. You will need one board cut to 1′-4 3/4″ two boards cut to 3′-3/4″ that will be the vertical girts and two boards cut to 1′-7 3/4″ that will be the horizontal girts.

11.2 Mill a recess along the vertical girts for the jalousies.

11.3 Use 1/4″ x 1 1/2″ pressure-treated lumber for the jalousies. You will need twenty-two boards cut to 1′-5 3/4″.

11.4 Install two 3″ door hinges using 6×1″ wood screws.
12x24 lean to garden shed decorative window shutters assembly

Step 12 – Install Decorative Door Shutters

It is necessary to prepare two decorative door shutters.

12.1 Assemble front frame using 1 1/2″ x 1 1/2″ pressure-treated lumber and secure with 3″ wood screws. You will need two boards cut to 6′-7″ that will be the vertical girts and two boards cut to 1′-5 1/2″ that will be the horizontal girts.

12.2 Assemble back frame using 3/4″ x 2 1/2″ pressure-treated lumber and secure with 5″ wood screws. You will need two boards cut to 6′-7″ that will be the vertical girts and two boards cut to 1′-3 1/2″ that will be the horizontal girts.

12.3 Use 3/4″ x 3/4″ pressure-treated lumber for the lattice. You will need thirty-six boards cut to 2′-3/4″. Assemble according to the drawing.
12x24 lean to garden shed decorative door shutters assembly

Step 13 – Assemble Roof Drainage System

13.1 Assemble roof drainage system on the front fascia board. You will need 5″ half round gutter 22′ long, two end pieces with the outlet, six 45°
elbows, two 3″ pipes 6′ long, two joint connectors and two end caps.

13.2 Fasten the round gutter to the fascia with the round fits of hunger.

13.3 Fasten the vertical pipe section with the four wall fasteners.
12x24 lean to garden shed roof drainage system assembly

Step 14 – 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 garden shed

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12x24 lean to garden shed plan

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