Two houses of the same size can differ widely in cost. Knowing why helps you set a realistic budget before you start.
Finish level
Flooring, doors, windows, bathroom fittings, electrical fixtures and paint are the biggest swing. Basic and premium finishes of the same house can differ greatly.
Structure and floors
More floors, a basement, larger spans and heavier loads need more steel and concrete. Soil quality affects the foundation.
Design complexity
Projections, curves, double-height spaces and large openings cost more than a regular plan.
Timing and material prices
Cement, steel and labour rates move. A written specification with allowances for each item avoids disputes.
Items people forget
Approvals, soil test, compound wall, water tank, septic or sewer connection, electrical connection, landscaping and furniture.
Start with a range, then get a BOQ from drawings and keep a contingency. Try our calculators for an indicative figure.
General guidance only. Every project differs; consult your engineer for yours.