Plumbing & Electrical Rough-In Costs: What to Expect Behind the Drywall

The mechanical, electrical, and plumbing (MEP) rough-in phase represents the functional circulatory system of a remodeled room. Because this work is completely concealed behind drywall at final completion, homeowners are often surprised by rough-in labor invoices.

Understanding code requirements and material costs demystifies rough-in budgeting.

Electrical Rough-In Scope & Pricing

A typical kitchen or bathroom electrical rough-in involves:

• Dedicated Appliance Circuits ($200–$400 per run): Running 12/2 Romex directly back to the breaker panel for microwave, refrigerator, dishwasher, and garbage disposal.
• GFCI & AFCI Protection: Required by NEC code on all countertop receptacles and living areas to prevent ground faults and electrical arc fires.
• Recessed Can Lighting ($120–$180 per fixture installed): Wiring IC-rated airtight LED housing cans in ceiling joists.

Plumbing Rough-In Scope & Pricing

Plumbing divides into two distinct piping networks:

1. Water Supply Lines (PEX vs Copper): PEX-A (expansion PEX) has largely replaced rigid copper due to its freeze-burst resistance, flexible routing, and fast installation ($1,200–$2,500 for a standard bathroom).
2. Drain-Waste-Vent (DWV) Lines: Rigid PVC or ABS piping sloped at 1/4-inch per foot toward the municipal sewer line. Moving a toilet drain or shower P-trap is labor-intensive because it requires cutting structural joists and tying into vertical vent stacks through the roof ($1,500–$3,500+).