Bathroom remodeling in San Jose and across the Bay Area is a regulated construction process, not a cosmetic upgrade. Proper waterproofing, plumbing layout, ventilation, and electrical safety are required to meet California Building Code standards and pass local inspections.

This article explains what professional bathroom remodeling involves, how much it costs, and why hiring a licensed contractor is critical.

When Bathroom Remodeling Requires Permits

Bathroom remodeling projects typically require permits when they include:

  • Plumbing relocation or replacement

  • Electrical work (lighting, outlets, exhaust fans)

  • Tub-to-shower or shower-to-tub conversions

  • Structural floor or framing modifications

Most Bay Area cities require inspections at the rough plumbing, rough electrical, and final stages. Performing work without permits can lead to fines, failed inspections, insurance issues, and resale complications.

Waterproofing Requirements and Inspection Standards

Waterproofing is the most critical phase of bathroom remodeling.

Inspectors review:

  • Shower pan installation

  • Waterproof membrane systems

  • Drain slope and flood testing

  • Approved backer board materials

Common contractor mistakes include improper slope, missing membranes, and unapproved materials. Any failure usually requires tile removal and rework.

Plumbing and Electrical Code Compliance

Plumbing

  • Proper drain slope and venting

  • Pressure testing

  • Code-compliant fixture connections

Electrical

  • GFCI-protected outlets

  • Electrical safety zones

  • Proper exhaust fan sizing (CFM)

  • Grounding and circuit protection

All plumbing and electrical work must be performed by licensed trades.