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In the context of Figure 4, the P50 cost is represented as âcâ dollars. The P50 estimate is one with equal chance of project overruns or underruns up till when the project scope can be finalised. The P90 value is an estimate of the project cost based on a 90% probability that the cost will not be exceeded.his arises as the P90 cost estimation was adopted at the early stage during project scoping. Had the P50 cost estimate been adopted, there would have been a deviation of $7 million between the actual ($69 million) and budgeted P50 figure ($62 million). The project would have been under-budgeted.
1 The homewyse cost estimates include all typical costs for subsurface preparation, material layout and fabrication, edge restraints and surface finished flat, with proper drainage slope. 2  The homewyse Sandstone Paver cost estimates do not include costs for demolition / removal of existing hardscape or extensive grading.omewyse strongly recommends that you contact reputable professionals for an accurate assessment of work required and costs for your project-before making any decisions or commitments. 1  Sandstone Paver cost estimates may require an onsite inspection.