How does the calculator handle multi-generational layouts with larger footprints?

Larger footprints with separate living wings, multiple kitchens or independent entries for extended family increase both structural complexity and finishing scope beyond what a simple area multiplier captures, so the calculator's package and area inputs should reflect the actual planned layout rather than a rough guess. Discuss your family composition and privacy needs with your architect early, since retrofitting separate wings after a single-family layout is finalised is expensive. The calculator gives you a planning range; the layout brief is what actually shapes the final design.