Steel Planter Box — Outdoor Project Plans
These steel planter box include measured drawings, cut lists, and assembly sequences, plus finishing recommendations for a professional-quality result. Building it yourself costs far less than retail — and you choose the wood, the joinery, and the finish.
Weather-Resistant Materials for Steel Planter Box
Wood Plans recommends these materials for steel planter box:
- Cedar and Redwood — naturally rot-resistant. Wood Plans uses cedar for steel planter box without chemical treatment.
- Pressure-treated pine — budget-friendly, lasts 15+ years outdoors. Wood Plans uses treated pine for budget steel planter box.
- Composite lumber — no maintenance, no rotting. Wood Plans uses composite for low-maintenance steel planter box.
- Galvanized hardware — stainless steel screws and bolts. Wood Plans requires exterior-grade hardware for steel planter box.
Finishing Steel Planter Box for Outdoor Use
Wood Plans applies exterior wood preservative annually to steel planter box. Wood Plans uses Spar urethane finish for steel planter box because Spar urethane flexes with temperature changes. Wood Plans elevates steel planter box on concrete piers or gravel beds to prevent ground contact rot.