Commercial plumbing projects run from $5,000 for a small tenant improvement to $200,000+ for a full ground-up build. Fixture count, pipe material, floor plan complexity, and jurisdictional requirements all drive cost. This calculator builds a commercial plumbing estimate covering rough-in pipe, fixture installation, labor, permits, and your target margin.
Commercial toilet installation (floor-mount, floor-drain, with carrier): $1,200–$2,500 per unit including rough-in. Commercial urinal: $800–$1,800 installed. Commercial sink (stainless, countertop with faucet): $600–$1,500. Floor drain with trap primer: $300–$600. Commercial water heater (80-gallon, natural gas): $2,500–$5,000 installed. Rough-in labor for commercial plumbing runs $90–$150/hr in most markets.
Schedule 40 PVC (DWV): $0.40–$1.20/LF depending on diameter. Cast iron (noise reduction for multi-story): $3–$8/LF plus hangers. Copper (Type L, domestic water): $2.50–$6/LF depending on diameter. Press-fit copper fittings (faster than solder): $8–$25 per fitting but cut labor significantly. CPVC or PEX for domestic water where code allows: $0.50–$2/LF. Material selection should match the code requirements and building type — ask the inspector before committing to pipe spec.
Commercial plumbing permits are priced as a percentage of project value (typically 1–3%) plus a base fee. Budget $500–$3,000 for permits on a typical commercial TI. Backflow preventer installation (required for most commercial connections): $500–$1,500 per device including test and report. Backflow testing is required annually — position this as a recurring service revenue opportunity.
Commercial plumbing requires tight coordination with HVAC (shared utility trenches, condensate drainage), electrical (water heater and pump circuits), and general contractor schedule. Rough-in must be complete before concrete pours and drywall. Build project management time (5–10% of labor hours for scheduling, RFI responses, and coordination meetings) into your estimate — on commercial jobs it's rarely optional. Submittals and material approval add 4–8 hours of admin on most commercial projects.