The short answer
A per-square-foot fee is predictable; a percentage keeps the architect aligned with build cost but grows if the budget grows.
A per-square-foot fee is easy to budget and does not change when material prices move, which suits homeowners with a fixed envelope. A percentage of construction cost scales with complexity and keeps design decisions tied to build value, but it also rewards a larger budget.
A lump sum against a written scope is the clearest of all — provided the scope lists revisions, site visits and exclusions. Whichever basis you choose, fix it in the agreement with the assumed area or cost so the number cannot drift later.
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