Tell the supplier now if you want to add walls or doors later. The intended enclosure needs to be considered in the building design; it should not be treated as a separate purchase that will automatically fit.
Describe the future building
Will it become a garage, a storage room or a workshop? Will there be doors, windows, electrical service or a finished interior? Write down the likely future layout even if you are not ready to build it. Vague future flexibility is harder to evaluate than a specific scenario.
Ask the supplier and appropriate local reviewers what information they need to assess that scenario. Do not treat a statement that panels can be added as confirmation that the entire future project is approved or engineered.
Identify decisions made today
Ask the building designer how the later walls and doors would affect the foundation and frame. Ask which provisions can reasonably be included now and which would need later redesign. Keep any future assumptions in the written proposal so they are available when the time comes.
Consider access during the transition. A post that is harmless in an open parking shelter may conflict with the garage-door arrangement you eventually want.
Compare the staged and complete projects
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