Most online cost figures answer the wrong question. They describe an average, but no client builds an average house — they build a specific home on a specific lot with a specific structure and specification.
A reliable budget basis starts with the lot: terrain, soil, access, and drainage influence foundations and construction method long before finishes are chosen.
What actually moves the cost
Structure and spans: long clear spans and cantilevers cost more per square metre than efficient, well-proportioned structural grids.
Specification: kitchens, bathrooms, glazing, and built-ins carry a disproportionate share of the budget relative to their floor area.
Site logistics: access for materials and equipment, staging space, and hauling affect labor and time, especially on tight or sloping lots.
Scope boundaries: what is included — perimeter works, landscaping, utilities, contingencies — changes comparisons between quotes more than unit prices do.
How to use cost figures responsibly
Treat published per-square-metre numbers as orientation, not quotation. A useful planning basis is only possible once site, floor area, structural system, specification, scope, location, and schedule are reviewed together.
During the assessment and design stages, ARDesign aligns the budget with the design as decisions are made — so cost conversations happen while options are still open, not after they are closed.