EV charging
Home EV charger installation in San Francisco
Home charging is convenient, but it is also one of the largest loads a home can add. Planning starts with your parking situation and your panel.
Overview
Level 1, Level 2, and what your home needs
Level 1 charging uses a standard 120-volt outlet. It is slow — often adding only a few miles of range per hour — but can be enough for short daily commutes. Level 2 charging uses 240 volts and typically adds range several times faster; it is what most people mean by a home charger.
A Level 2 charger is usually installed on a dedicated circuit sized to the charger's requirements, either hardwired or through a 240-volt receptacle. Because EV charging is a continuous load that can run for hours, circuit sizing follows specific code rules, and the panel's available capacity is the key question.
Before buying a charger
- Check where you will park
- Note the distance to your panel
- Find the main breaker rating
- Ask about adjustable amperage
Situations
Common reasons people look into this
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You bought or leased an EV
And want faster, more convenient charging than a standard outlet.
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Using a standard outlet now
Long, regular charging on an existing outlet is a reason to check that circuit's condition.
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Replacing a charger
A new charger may draw more than the old one's circuit supports.
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Panel is full or small
Limited capacity or spaces may call for load management or upgrades.
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Garage far from the panel
Long circuit runs affect scope and wire sizing.
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Planning for two EVs
Power-sharing chargers can serve two vehicles on one circuit.
Technical
Technical considerations
Circuit sizing
Chargers are rated by the current they draw. Because charging is treated as a continuous load, the circuit must be sized with a margin above the charger's draw, per code. Many chargers allow the installer to set a lower maximum current to match available capacity.
Capacity and load management
If a load calculation shows limited headroom, options include setting the charger to a lower current, installing a load management device that reduces charging when other loads are high, or upgrading the panel or service.
Location details
Outdoor and garage installations need equipment rated for the location. The route from the panel to the charger — through walls, ceilings, or along garage surfaces in conduit — often determines labor and timeline. Some installations require protection from vehicle impact.
Assessment
What an electrician typically evaluates
Every property is different. A qualified electrician will usually look at the following before recommending any work.
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Panel capacity and spaces
A load calculation to determine safe charging current.
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Charger specifications
Required circuit size, hardwire versus receptacle, and listing.
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Route and distance
Path from panel to parking spot and any obstacles.
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Location suitability
Indoor/outdoor ratings, mounting surface and cable reach.
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Load management options
If capacity is limited, what devices could help.
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Permits
Permit and inspection requirements for the circuit and equipment.
Talk through your situation
A short call can help you understand what an on-site assessment would involve.
Local context
San Francisco housing considerations
Off-street parking is limited in much of San Francisco. Many homes have tandem garages beneath the living space, accessed by a steep driveway, with the electrical panel nearby in the garage — often a convenient arrangement. Others have no off-street parking at all.
In flats and small multi-unit buildings, the garage may be shared, and the closest panel may be a house panel rather than your unit's panel — which raises questions about capacity and billing. See shared garage EV charging for those situations. San Francisco has also been developing curbside charging permits through SFMTA; check SFMTA for current rules.
Permitting
Permits and inspections
Installing an EV charger circuit generally requires an electrical permit and inspection through San Francisco DBI. State law encourages streamlined permitting for residential EV charging, and DBI has offered expedited electrical permits for registered contractors. Requirements for your specific installation should be confirmed by the installer.
If panel or service upgrades are part of the project, they carry their own permit and utility requirements.
Not legal advice. Permit requirements depend on the exact scope of work and the codes in force when the permit is issued. The provider performing the work is responsible for determining and obtaining the correct permits.
Frequently asked questions
Do I need a panel upgrade for an EV charger?
Not always. Many homes can add a charger by choosing an appropriate charging current or using load management. A load calculation tells you whether there is room.
Hardwired or plug-in?
Both can be appropriate. Hardwired chargers avoid receptacle wear and may allow higher currents; plug-in units can be moved. Follow the charger manufacturer's instructions and code requirements — your electrician can advise.
Can I install a charger in a rental?
With the property owner's approval. California law includes provisions for tenant requests to install EV charging, with conditions. Review the current law or get advice for your situation.
Is a permit really necessary?
A new 240-volt circuit generally requires a permit and inspection. Inspections confirm the installation meets code, which can also matter for insurance and resale.
Official resources
Requirements change. Check current information directly with these official sources.
- San Francisco Department of Building Inspection (opens in a new tab) www.sf.gov Permits and inspections for electrical work in San Francisco.
- PG&E (opens in a new tab) www.pge.com The electric utility serving most San Francisco addresses; involved in service upgrades and meter work.
- SFMTA (opens in a new tab) www.sfmta.com Transportation agency; information on curbside EV charging programs.
- CSLB license lookup (opens in a new tab) cslb.ca.gov Check a contractor's license number, classification and status before hiring.
Ready to talk to an electrical professional?
Call to speak with an electrical professional who can assess your property and explain your options.