Bathroom Remodel Plumbing Calculator

Labor Cost, Total Estimated Cost, and Cost Per Fixture all rise directly with Plumber Hourly Rate ($) -- this rises across the full $40-$200/hr range -- since Labor Cost is simply Labor Hours × Plumber Hourly Rate, and that flows straight through to the totals. Contingency Reserve moves the same way with Contingency %, since it's a direct percentage of the running subtotal. Pipe Material genuinely scales Fixture & Material Cost by a real multiplier -- PEX at 1.0×, CPVC at 1.1×, Copper at 1.45× -- so switching from PEX to Copper raises that line item 45%.

This calculator's own automated sensitivity check can't confirm that relationship directly, though: Pipe Material's default is PEX (0), and a value of exactly zero is skipped by the ±10% local-perturbation method this site uses, so this effect isn't independently confirmed by that automated check, even though the underlying multiplier is real and verifiable by hand. Total Fixtures and Fixtures Being Relocated work the same way -- both are genuine cost drivers (fixture count multiplies material cost directly; relocated fixtures each add a flat $1,200 surcharge and double their own labor hours), but each sits at a small integer default (3 and 1) that a ±10% nudge rounds straight back to, so this calculator's local sensitivity probe can't detect their effect near the default either.