As of this month, a San Francisco remodel that touches the furnace and the walls can’t put gas back in.
The city’s All-Electric Major Renovations Ordinance applies to building permit applications submitted on or after July 1, 2026. Qualifying projects can’t install a new gas furnace, water heater, stove or clothes dryer, and can’t run gas or propane piping to serve those uses. Board President Rafael Mandelman sponsored the measure, with Supervisors Fielder, Melgar and Mahmood co-sponsoring. It passed unanimously.
What actually triggers the requirement
The two-part test is the whole story for estimators. A project has to both replace the building’s core systems, meaning the furnace or water heater, and involve substantial work to the building itself: reworking walls across most of the house, changing the structure, or adding significant new space.
Both conditions have to be met. A kitchen refresh doesn’t trigger it. A single bathroom doesn’t. Swapping a failed water heater on its own doesn’t. A gut renovation that also replaces the furnace does.
That threshold is going to generate scoping arguments, and contractors should expect owners to ask whether a scope can be trimmed below the line. It also means the same house can get two very different bids depending on how the work is packaged.
The real cost sits in the electrical service
The equipment swap is the easy part. Heat pumps for space conditioning and water heating, induction cooking and electric drying all land on a panel that in San Francisco’s older housing stock is frequently 100 amps or less, sometimes with knob-and-tube upstream. Service upgrades, panel replacements, new branch circuits and in some cases a utility coordination timeline are the actual budget and schedule drivers.
The city’s analysis found that going all-electric during a major renovation can cost less than an equivalent mixed-fuel project, since you’re not paying to extend and maintain two energy systems through the same walls. That math holds better when the service upgrade was already required than when the ordinance is what forces it.
Why this ordinance travels
San Francisco already required all-electric new construction. Extending it to major renovations reaches the existing building stock, which is where the emissions actually are and where the city’s 2040 net zero target lives or dies.
It also matters beyond city limits. San Francisco building ordinances have a long history of getting copied across California and up the West Coast, and renovation-triggered electrification is a policy other jurisdictions have watched without moving first. Residential builders working new construction in San Francisco have operated under all-electric rules for years. The remodel market is only now catching up.
Sources: SF Environment Department, SF.gov.