Installed Cost Stack Comparator

Material price is one line. Excavation is the line that moves. Put your own local rates in and see what each system actually asks you to dig, haul and buy back.

Required storage (cubic metres)

1,000 m³ = 35,315 cu ft

Excavate + haul + dispose

currency per cubic metre

Stone, delivered & placed

currency per cubic metre

Gravel void ratio

Cost Stack Analysis

System	Void ratio	Storage-zone envelope	Excavation cost	Stone cost	Earthwork subtotal

This tool prices earthwork only. It deliberately omits module price, freight, duty, dewatering, geotextile, connections, labour and geotechnical borings — add those from your own quotations. Stone volume for the gravel trench is the envelope less its void space; the arch chamber figure assumes stone surround at a 45% system void; the crate and vault figures assume bedding and perimeter stone only, taken as 12% of envelope. Change any assumption you disagree with; the arithmetic is all in the page source.

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