How to accurately estimate site development costs for a dual occupancy project in suburban Adelaide?

Accurately estimating site development costs for a suburban Adelaide dual occupancy project necessitates a comprehensive site analysis. Key factors include demolition, excavation, and earthworks, especially if retaining walls are required due to site topography. Consider infrastructure upgrades like stormwater, sewerage, and utility connections (power, water, gas, NBN), often requiring significant off-site works. Geotechnical reports are crucial for foundation design and costing. Always factor in council development application fees, specialist consultant reports (e.g., arborist, heritage), and landscaping. Obtain detailed quotes from licenced contractors for each component to minimise financial surprises and ensure compliance with the Planning and Design Code.