User-controlled planning allowance
Retaining Wall Cost Calculator
Enter the wall face dimensions and your own expected square-metre rate. The calculator shows the arithmetic without pretending to be a quote.
Visible method
How this is calculated
What it is: a user-controlled planning allowance based on wall face area. It is not a quote, engineering estimate, profit figure or permit assessment.
Formula: wall length × average exposed height × the rate you enter. The upper result adds your selected planning buffer.
Benchmark source: no benchmark figure or hidden coefficient is supplied by this site. Enter a rate from your own written quote, quantity-surveyor advice or contractor discussion. Consumer Affairs Victoria provides guidance on defining scope and using written contracts.
Assumptions: the model treats the wall as a simple average face area. It ignores demolition, access, excavation, footings, drainage, engineering, permits, corners, stairs, fences, services, spoil, finish and site conditions unless your entered rate already includes them.