8 x 12 Garden Shed Plan

Introduction

This shed offers you backyard style and lots of storage space. Its 106 square feet of floor space and nearly seven-foot ceiling plate will give you plenty of walking space and head room for all but the tallest.
The pleasing exterior features shuttered windows and lattice-framed doors that give the garden shed an inviting appearance for the backyard. Since it's built similar to a house, it would be easy to add wiring and plumbing to make the shed a more functional and livable space. Sturdy flooring and finishes could make it a dual-purpose building for your enjoyment and convenience.

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 135 bricks for this step.

8x12 gable 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 nine boards cut to 7′-9″ for the floor joists.

2.2 Secure the beams with 8×5″ flat head Phillips wood screws.

2.3 Using the square of your choice, check the corners to make sure they are 90°.

8x12 gable 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 three boards cut to 11″ that will be the cripple studs, one board cut to 5′-4″ that will be the door header, ten boards cut to 6′-11″ that will be the studs, two boards cut to 3′-4″ that will be the bottom plates and one board cut to 12′ 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°.

8x12 gable garden shed front wall framing

Step 4 – Assemble Back Wall Frame

4.1 Build the back wall frame using 1 1/2″ x 3 1/2″ and 3 1/2″ x 3 1/2″ treated lumber, using the drawing below as a reference. You will need ten boards cut to 6′-11″ for the studs and two boards cut to 12′ for the top and bottom plates.

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

4.3 Be sure that the corners are 90°.

8x12 gable garden shed back wall framing

Step 5 – Assemble Left and Right Wall Frames

5.1 Construct the side wall frames using the drawing below as a reference and using 1 1/2″ x 3 1/2″ pressure-treated lumber. You will need four boards cut to 5 1/2″ to use as the cripple studs, four boards cut to 2′-10 1/2″ that will be the wall studs, two boards cut to 3′-4″ for the window header and rough sill, six boards cut to 6′-11″ to use as the studs and two boards cut to 7′-5″ that will be the top and bottom plates.

5.2 Join the beams with 2×4″ flat head Phillips wood screws.

5.3 Check the corners to make sure that each one is 90°.

8x12 gable garden shed side walls framing

Step 6 – Assemble the Roof Frame

6.1 Cut twenty rafters 5′-10 1/4″ long using 1 1/2″ x 5 1/2″ treated lumber, according to the dimensions.

6.2 Use 1 1/2″ x 3 1/2″ treated lumber to cut eight collar ties 5′-11 3/4″ long according to the dimensions.

6.3 Cut the ridge board 12′ long using 3/4″ x 7 1/4″ pressure-treated board, according to the illustration below.

6.4 Attach the beams to each other with 2×3″ Phillips flat head wood screws.

8x12 gable garden shed roof framing

Step 7 – Assemble and Install Shed Doors

8.1 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″ for the vertical girts and two boards cut to 2′-3/4″ for the horizontal girts.

8.2 Cut two doors out of the 9/16″ plywood sheet to 2′-7 3/4″ x 5′-11 3/4″ by using the layout shown below.

8.3 Use 2 1/2″ x 3/4″ treated lumber for the door trim and fasten with 2″ Phillips flat head wood screws. You will need two boards cut to 2′-2 3/4″ and two boards cut to 5′-11 3/4″.

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

8.5 Use 1/2″ x 6″ wood siding boards for the exterior siding on the doors, and the illustration below as a tool.

8.6 Assemble siding shields with 2″ galvanized nails.

8.7 Install three 3″ door hinges using 6×1″ Phillips wood screws. Finish the installation of the door by attaching 4″ surface bolts and 6″ door pulls.

8x12 gable garden shed door

Step 8 – Roof Sheathing Installation

8.1 This garden shed requires 160 square feet of asphalt shingle roofing.

8.2 Add the metal drip edge to the fascias.

8.3 Cover the plywood sheeting with roofing felt or building paper.

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

8x12 gable garden shed roof sheathing

Step 9 – Window Installation for Side Walls

9.1 Using 1 1/2″ x 2 1/2″ treated lumber, make the outer frame for the window as shown below. You will need two boards cut to 3′-1″ for the vertical gifts and two boards
cut to 3′-4″ for the horizontal girts. Additionally, add vertical 2′-11 1/2″ long and horizontal 3′-1″ long supports using 3/4″ x 1″ lumber and carve out the recesses for the window hinges.

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

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

9.4 Install glass into the inner frame groove and fasten it with window beading on all sides. Secure with 1/2″ brads.

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

8x12 gable garden shed window

Step 10 – Assemble and Install Window Shutters

10.1 This plan requires four window shutters.

10.2 Make the shutter frames using 3/4″ x 1 1/2″ treated lumber and attach with 3″ wood screws. You will need one board cut to 1′-4 3/4″, two boards cut to 3′-3/4″ for the vertical girts and two boards cut to 1′-7 3/4″ for the horizontal girts.

10.3 Mill a recess along the vertical girts for the slats, using Section L-L on page 34 as a reference.

10.4 Use 1/4″ x 1 1/2″ treated lumber for the slats. You will need 22 boards cut to 1′-5 3/4″.

10.5 Install two 3″ door hinges using 6×1″ flat head wood screws.

8x12 gable garden shed window shutters

Step 11 – Assemble and Install Pergolas

11.1 This shed requires two pergolas.

11.2 Construct the front frame using 1 1/2″ x 1 1/2″ treated lumber and secure with 3″ flat head wood screws. You will need two boards cut to 6′-7″ as the vertical girts and two boards cut to 1′-5 1/2″ to use as the horizontal girts.

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

11.4 Use 3/4″ x 3/4″ treated lumber for the lattice. You will need 36 boards cut to 6′-7″. Assemble according to the drawing.

8x12 gable garden shed pergolas

Step 12 – Assemble and Install Roof Drainage System

12.1 Put together the roof drainage system on the front fascia board. You will need 5″ half round gutter 10′ long, two end pieces with the outlet, six 45° elbows, two 3″ pipes 6′ long, two joint connectors and two end caps.

12.2 Fasten the round gutter to the fascia with the seven round hangers.

12.3 Fasten the vertical pipe sections with the four wall fasteners by spacing them out evenly.

8x12 gable garden shed roof drainage system

Step 13 – Assemble and Install Door Ramp

13.1 Assemble five 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″.

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

13.3 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.

13.4 Assemble siding shields with 2″ galvanized nails.

8x12 gable garden shed door ramp

Step 14 – Decorate the Shed

After finishing the garden shed, apply paint, wood stain or a wood preservative to it immediately. Any of these finishes will prevent moisture from damaging the plywood.
8x12 gable garden shed

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8x12 garden shed plan