Use reclaimed materials such as old windows, doors, pallets, and lumber
Choose a simple shape like a hoop house or lean-to
Build on level ground to avoid extra foundation work
Use PVC pipe, conduit, or treated wood for the frame
Cover with greenhouse plastic or poly film instead of glass
Secure the covering with battens, clips, or staples
Add a door made from salvaged materials
Use gravel, pavers, or bare soil for the floor
Collect rainwater with barrels for low-cost watering
Add ventilation with roll-up sides, vents, or cheap windows
Insulate with bubble wrap or recycled materials in colder months
Start small and expand later
Buy materials secondhand from salvage yards, classifieds, or construction leftovers
Keep the design simple to reduce labor and material costs
Anchor the structure well to withstand wind without expensive framing
Use passive solar placement with maximum sun exposure
Reuse containers, trays, and shelves for planting
Make repairs with tape, clamps, and spare plastic instead of replacing parts
Avoid unnecessary features like automatic systems or expensive glazing