Greenhouse Plans – 8’x8′ – Step-By-Step Plans

Use four pressure treated 4×4’s 8′ long for the foundation. Notch the corners as shown on illustration above. Secure the corners using 3 1/2″ screws. To keep the foundation from shifting secure it down with wood spikes.

Build the side walls using 2×4’s. Cut four 2×4’s to 8′ for the top and bottom plate. Cut ten 2×4’s to 6′ for the wall studs. Install as shown on illustration above using 3 1/2″ nails.

Cut eight 1×4’s to 3′ 2 11/16″ for the wall brace. The ends will have 45 degree angle cuts in the same direction. Notch the wall studs around the brace as shown on illustration above. Nail 3″ nails through the brace and into the studs.

Cut ten 2×4’s to 1′ 10 1/2″ to make the vent/window frames, install as shown above using 3 1/2″ nails.

Build the front and back wall using 2×4’s. Cut four 2×4’s to 7′ 5″ for the top and bottom plate. Cut eight 2×4’s 6′ long for the studs. Install as shown on illustration above using 3 1/2″ nails.

Cut eight 1×4’s to 3′ 5 1/8″ for the wall brace. The ends will have 45 degree angle cuts in the same direction. Notch the wall studs around the brace as shown on illustration above. Nail 3″ nails through the brace and into the studs.

Build the top ridge using a 2×4. Cut two 2×4’s to 1′ 2 3/8″ long and one 2×4 to 8′ long. Assemble as shown on illustration above using 3 1/2″ nails.

Remove the 2×4 plate on the door entrance as shown on illustration above.

Cut ten 2×4’s to 4′ 2 7/16″ long for the rafters. Cut the ends of the rafters as shown on illustration above.

Install the rafters as shown on illustration above using 3 1/2″ nails. Notch the rafters and install a 1×4 brace to the roof. Nail 3″ nails through the brace and into the rafters.

Cut two 2×4’s to 8′ long, rip the 2×4’s to 2 9/16″, cut an 18 degree bevel cut to the edge. Nail 3 1/2″ nails through the 2×4 and into the rafters.

Install the greenhouse plastic using staples.

Cut 1×2 trim to size and install as show on illustration above. To make replacing the plastic easier if required use 1 1/4″ deck screws, screw through the 1×2 trim and into the frame.

Build the door frame using 2×2’s. Cut two 2×2’s to 6′ 1 1/2″ long and three 2×2’s to 3′ long. Notch and assemble as shown on illustration above using 1 1/4″ deck screws.

Staple the greenhouse plastic to the door frame. Cut 1×2 trim to size and install over plastic, screw 1 1/4″ deck screws through the trim and into the frame. Install hinges and door handle.

Build the window/vent frames using 2×2’s. Cut twelve 2×2’s to 1′ 10 1/2″ long and twelve 2×2’s to 2′ long. Notch the corners and assemble using 1 1/4″ deck screws.

Staple the greenhouse plastic to the window/ vent frame. Cut 1×2 trim to size and install over plastic, screw 1 1/4″ deck screws through the trim and into the frame. Install the hinges to the window/vents.

Install door and window/vents.