What it costs, what's permitted, and what to ask before you hire.
Last verified: 2026-05-31 · Well-sourced
Panel / electrical
May require a panel upgrade
Permit likelihood
Confirm with your building department
Permit snapshot
plumbing + electrical permit
As of 2026-05-31, residential heat pump water heater (HPWH) installations in the City of Oakland typically require a plumbing permit (and an electrical permit when a new dedicated 240 V circuit is required) from the Bureau of Building within PBD. Most like-for-like water heater replacements — including HPWH replacements where electrical capacity is already present — typically qualify for an over-the-counter / online no-plan Combination Permit when paired with a new dedicated electrical circuit. Installations that change equipment location, require structural seismic-strap or platform changes beyond standard practice, or trigger gas-line modifications beyond a simple cap route through traditional plan review. The contractor is typically required to be a C-36 (Plumbing) and/or C-10 (Electrical) licensed contractor authorized to perform the work. Permits filed January 1, 2026 or later are reviewed under the 2025 California Plumbing Code, 2025 California Electrical Code, and 2025 California Energy Code. Verify current Combination Permit eligibility and scope with the Bureau of Building before scheduling installation.