The foundation needs to be square and strong. Cut two 2x4s to 6 ft and two to 3 ft 9 in. Assemble into a rectangle, ensuring diagonals are equal. Fasten with 3-inch screws.

Cut four 2×4 posts to 5 ft. Attach them vertically at each inside corner of the base. Build an identical top frame and secure it on top of the posts. You now have a sturdy box.

Create a simple pitched roof. Cut ten 2×2 rafters with 45-degree angles. Attach them in pairs to the top frame using rafter ties, spaced every 24 inches. Add a 6 ft 2×2 ridge purlin at the peak.

Measure openings, then score and snap polycarbonate sheets to size. Lay a bead of silicone on the frame, press the panel on, and fasten with special gasketed screws. Do not overtighten!

Use 2x2s to frame a simple door. Attach a polycarbonate panel to it. Hang the door with hinges and add a latch. Apply weather-stripping tape around the frame for a snug seal.

For fruiting plants (tomatoes, etc.), you need a minimum of 6-8 hours of direct sunlight. For leafy greens and herbs, 4-6 hours is sufficient.

In mild climates (Zones 8-10), yes! In colder zones, it acts as a cold frame, protecting plants from frost but won’t stay warm enough for active growth without a small heater. It’s perfect for getting an early start on spring seeds.