Decide what the project needs to do
Start with a short brief: “A freestanding cover for one nursery pot, beside the patio door.” That is easier to plan than “make the balcony look better.” Decide whether the outer structure will hold soil directly or simply conceal a separate growing container. For a first project, using a removable inner pot can make access and replacement simpler.
This guide is a planning checklist, not a load-bearing construction specification. Use a complete, suitable construction plan or a rated commercial product where structural strength, fastening, or attachment to a building is involved.
Measure three different things
- The available space: include doors opening, walking room, and access for cleaning.
- The growing container: measure its widest point, height, handles, and any saucer.
- The finished outside dimensions: allow for material thickness and the way the pieces join.
Sketch both a top view and a side view. Mark which measurements are internal. A 60 cm external width is not 60 cm of usable planting space once walls and supports take up room. Use cardboard or masking tape on the floor to check the footprint before committing to materials.
Think about the water route
Follow an imaginary watering can from the plant to the ground. Water should be able to leave the growing container without sitting against vulnerable materials or spilling where it causes a problem. Keep drainage openings accessible for inspection. Do not assume a decorative outer box provides adequate drainage.
If a saucer is needed to protect a surface, make sure you can remove it. Plan to lift out the inner pot or reach underneath it, rather than sealing everything into a box that cannot be checked.
Take a useful list to the shop
Your list should include the cut plan, material thickness, finish suitable for the intended use, compatible fasteners, and the inner container. Confirm product suitability with the supplier, particularly for edible crops. Avoid reclaimed materials with an unknown treatment history.
Before filling the planter, place it in its final location and check stability. A container that is easy to move when empty can become difficult to handle after watering. Do not use our volume calculator to infer weight capacity.