20 x 10 Garden Shed Plan

Introduction

With 200 square feet of interior space and a generously covered patio, this 20x10 garden shed lends itself to storage and beyond. It's large enough for every yard and garden tool you have, and even more from the garage. The double door entry makes it easy to roll the heaviest and most awkward equipment inside. The patio adds versatility to the shed. Poolside, it would be a great place to store the brush and net behind a comfortable patio set. Place a gas-burning fire pit table on it, and you have a relaxing focal point. The shutters on the entry doors and the window add elevation appeal and with wiring, plumbing, and insulation, you have a solid option for adding livable space to your home as well as viable storage.

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 220 bricks for this step.
20x10 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 10′ that will be the rim joist and two boards cut to 9′-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°.
20x10 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 five boards cut to 11″ that will be the cripple studs, one board cut to 5′-4″ that will be the door header, eight boards cut to 6′-11″ that will be the studs, two boards cut to 2′-4″ that will be the bottom plates and one board cut to 10′ that will be the top plate.

3.2 Connect the beams with 2×4″ wood screws.

3.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
20x10 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 nine boards cut to 6′-11″ that will be the studs and two boards cut to 10′ that will be the top and bottom plates.

4.2 Connect the beams with 2×4″ wood screws.

4.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
20x10 garden shed back wall framing

Step 5 – Assemble Left Wall Frame

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 four boards cut to 5 1/2″ that will be the cripple studs, four boards cut to 2′-10 1/2″ that will be the studs, two boards cut to 3′-4″ that will be the window header and rough sill, eight boards cut to 6′-11″ that will be the studs and two boards cut to 9′-5″ that will be the top and bottom plates.

5.2 Connect the beams with 2×4″ wood screws.

5.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
20x10 garden shed left wall framing

Step 6 – Assemble Right Wall Frame

6.1 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 nine boards cut to 6′-11″ that will be the studs and two boards cut to 9′-5″ that will be the top and bottom plates.

6.2 Connect the beams with 2×4″ wood screws.

6.3 Using a speed square or carpenter’s square, check the corners to make sure they are 90°.
20x10 garden shed right wall framing

Step 7 – Assemble the Roof Frame

7.1 Using 1 1/2″ x 5 1/2″ pressure-treated lumber, cut eighteen rafters 6 ‘-7 3/4″ long according to the dimensions.

7.2 Using 1 1/2″ x 3 1/2″ pressure-treated lumber, cut seven collar ties 4′-10 1/4″ long according to the dimensions.

7.3 Using 3/4″ x 7 1/4″ pressure-treated board, cut the ridge board 10’ long according to the illustration below.

7.4 Connect the beams with 2×3″ wood screws.
20x10 garden shed roof framing

Step 8 – Assemble The Awning’s Roof Frame

8.1 Using 1 1/2″ x 5 1/2″ pressure-treated lumber, cut nine rafters 11′-1″ long according to the dimensions in drawing below. Cut the recesses in each beam for splicing connection with wall frames.

8.2 Connect the beams with a top frame and shed’s rafters with the help of 3″ wood screws.
20x10 garden shed awning roof framing

Step 9 – Assemble and Install Shed Doors

9.1 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.

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

9.3 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″.

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

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

9.6 Assemble siding shields with 2″ galvanized nails.

9.7 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.
20x10 garden shed door

Step 10 – Roof Sheathing Installation

10.1 You will need 260 Sq Ft of asphalt shingle roofing.

10.2 Add the metal drip edge to the fascias.

10.3 Cover the plywood with building paper.

10.4 Install asphalt shingle roofing using an industrial stapler.

Step 11 – Window Installation for Left Wall

11.1 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.

11.2 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 as shown.

11.3 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.

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

11.5 Install two hinges (3″) with 6×1″ wood screws and assemble the window. Install a lock on the inner side of the window.
20x10 garden shed window

Step 12 – Assemble and Install Window Shutters

It is necessary to prepare 2 windows shutters.

12.1 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.

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

12.3 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″.

12.4 Install two 3″ door hinges using 6×1″ wood screws.
20x10 garden shed window shutters framing

Step 13 – Assemble and Install Decorative Door Shutter

It is necessary to prepare two decorative door shutter.

13.1 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 11″ that will be the horizontal girts.

13.2 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 9″ that will be the horizontal girts.

13.3 Use 3/4″ x 3/4″ pressure-treated lumber for the lattice. You will need thirty-four boards cut to 1′-3 1/2″. Assemble according to the drawing.
20x10 garden shed decorative door shutter framing

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.

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20x10 garden shed plan