10 x 20 Garden Shed Plan


When you need a storage space or workshop in your yard that is architecturally pleasing but fully functional, look no further than this 10x20 shed. The walls are 16" on center and there's plenty of room for batt insulation in the walls, floor, and ceiling. The shed is easy to wire and plumb since there's plenty of room. The roof is strong enough for solar panels and there's enough room for battery storage.
It has two generous windows, a double-door entry and an easy-access ramp for loading and unloading. The doors are framed by lattice panels and each window has shutters on hinges. With some paint and landscaping, this shed could be as attractive as it is functional for the larger yard.

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 250 bricks for this step.

10x20 garden shed foundation preparation

Step 2 – Framing The Floor

2.1 Make the frame using pressure-treated lumber. You will need fourteen boards for the floor joists.

2.2 Use Phillips flat head wood screws to attach the beams together.

2.3 Measure the corners to make sure they are 90° for the garden shed.

10x20 garden shed floor framing

Step 3 – Assemble Front Wall Frame

3.1 Using pressure-treated lumber, construct the front wall frame using the drawing below.

3.2 Connect all the beams with flat head Phillips wood screws.

3.3 Using a speed or carpenter’s square, check the corners to make sure they are 90°.

10x20 garden shed front wall framing

Step 4 – Assemble Back Wall Frame

4.1 Using treated lumber, construct the back wall frame using the drawing below to guide you.

4.2 Join the beams for the garden shed with wood screws.

4.3 Using a square, check the corners to make sure they are 90°.

10x20 garden shed back wall framing

Step 5 – Assemble Side Walls Frames

5.1 Using treated lumber, make the side wall frames using the drawing below as a visual tool.

5.2 Assemble the parts with Phillips flat head wood screws.

5.3 Verify that the corners are 90°.

10x20 garden shed side walls framing

Step 6 – Assemble the Roof Frame

6.1 Using pressure-treated lumber, cut 34 pieces that will form the rafters according to the dimensions.

6.2 Using pressure-treated lumber, cut fifteen collar ties.

6.3 Using treated lumber, cut the ridge board according to the illustration below.

6.4 Connect the beams with Phillips wood screws.

10x20 garden shed roof framing

Step 7 – Install Shed Doors

7.1 Build the door frames for the shed using treated lumber and secure with flat head Phillips wood screws.

7.2 Cut the plywood sheet into two pieces for the doors according to the drawing.

7.3 Use treated lumber for the door trim and fasten with Phillips flat head wood screws.

7.4 Cut and install a starter course.

7.5 Use wood siding boards to cover the door.

7.6 Assemble siding shields with galvanized nails.

7.7 Install door hinges using Phillips wood screws. Finish the door installation by attaching surface bolts and door handles.

10x20 garden shed door

Step 8 – Roof Sheathing Installation

8.1 You will need 300 square feet of the asphalt shingle roofing of your choice.

8.2 Add the metal drip edge to the fascias.

8.3 Cover the plywood with roofing felt or building paper.

8.4 Install asphalt shingle roofing using an industrial stapler or hammer and roofing nails.

10x20 garden shed roof sheathing

Step 9 – Window Installation for Side Walls

This garden shed uses 2 windows built onsite.

9.1 Using pressure-treated lumber, assemble the outer frame for the window as shown in the drawing below.

9.2 Use pressure-treated material to make the inner frame and secure with wood screws.

9.3 Use treated wood to make the inner frame supports and secure with wood screws.

9.4 Prepare and install glass into inner frame groove and fasten it with window beading from four sides.

9.5 Install two hinges with flat head wood screws and assemble the window. Install a lock on the inner side of the window.

10x20 garden shed window

Step 10 – Assemble and Install Window Shutters

This plan requires four handmade window shutters.

10.1 Assemble frames using treated lumber and secure with flat head wood screws.

10.2 Mill a recess along the vertical girts for the slats.

10.3 Use pressure-treated lumber for the 24 slats.

10.4 Install two door hinges using wood screws for each shutter.

10x20 garden shed window shutters

Step 11 – Assemble and Install Pergolas

This garden shed plan uses two pergolas to accent the front door.

11.1 Assemble front frame using treated lumber and secure with flat head wood screws.

11.2 Assemble the back frame using treated lumber and secure with Phillips wood screws.

11.3 Use pressure-treated lumber for the lattice. You will need 36 boards.

10x20 garden shed pergolas

Step 12 – Assemble and Install Roof Drainage System

12.1 Assemble roof drainage system on the front fascia board. You will need half round gutter, end pieces with the outlet, 45° elbows, pipes, joint connectors and end caps.

12.2 Fasten the round gutter to the fascia with the eleven round hungers.

12.3 Fasten the vertical pipe section with the four wall fasteners.

10x20 garden shed roof drainage system

Step 13 – Assemble and Install Door Ramp

13.1 Assemble the 5 door ramp frames from treated lumber and secure with Phillips wood screws.

13.2 Secure all frames using a board and flat head Phillip wood screws.

13.3 Cut the plywood for the top and two sheets for the sides.

13.4 Assemble siding shields with galvanized nails.

10x20 garden shed door ramp

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.
10x20 gable garden shed

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10x20 garden shed plan

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