Electricians inspecting the electrical panels and meters on a multifamily house
Electricians inspecting the electrical panels and meters on a multifamily house. Photo: Tomwsulcer, CC0, via Wikimedia Commons.

Electrical Mountain View

Mountain View's 200-amp floor and its 2026 heat pump rule, for owners

Once a Mountain View house outgrows its panel, City Code Section 8.51 sets the size of the upgrade: at least 200 amps for a one-family home. Since January 1, 2026, the city's electrification reach code also turns a replaced central air conditioner into a heat pump, and asks for pre-wiring wherever new gas equipment goes into a remodel or addition. Like-for-like panels, chargers and heat pumps can be permitted online.

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Upgrade minimum
200 amps for a one-family home, City Code Sec. 8.51(C)
Reach code
Ordinance No. 9.2025, in effect January 1, 2026
Power
Silicon Valley Clean Energy supply; PG&E reconnects new panels
Title 24 climate zone
Zone 4 for ZIP codes 94040, 94041 and 94043

The work

What usually brings an electrician to a Mountain View house

  • A panel upgrade sized to the city's floor

    When a load calculation shows the existing panel cannot carry a new heat pump, water heater or charger, the replacement must be at least 200 amps for a one-family house. The city issues an online permit for a residential panel replaced in the same general location at that size, built to PG&E's installation standards, with the service grounding and bonding redone. It is not available for a relocated panel, a service above 200 amps, added subpanels, or other wiring done at the same time; those go through a regular permit.

  • Central air out, heat pump in

    On an existing one-family house, a permit to replace the central air conditioner is now a permit for a heat pump. The city and Silicon Valley Clean Energy note that a heat pump's power needs are very close to an air conditioner's, so the existing circuit usually serves. The outdoor unit must stay at least 3 feet from side and rear property lines, out of the front yard and out of view from the street, under the city's noise limits of 55 dBA by day and 50 at night.

  • EV chargers inside the panel's limits

    A charger in a garage or on an exterior wall of a house can be permitted online, as a new installation or a replacement, as long as it does not exceed the house's existing electrical capacity. When it would, the city gives two routes: an electrical load management system that keeps the total within the panel's rating, or a panel upgrade under its own permit. Chargers at apartment buildings, commercial properties or in an HOA's common area take the regular permit process.

  • Pre-wiring beside new gas equipment

    If a remodel or addition installs gas or propane equipment, such as a furnace, a dryer or a range, Mountain View now asks for the wiring a future electric replacement would need, run while the walls are open. The requirement covers only the parts of the house being altered or the equipment being replaced, not the whole home. The city's code update includes exceptions and alternative paths for cases where the pre-wiring alone would force a panel upgrade.

Mountain View City Hall
Mountain View City Hall. Photo: Aleh Haiko, CC BY-SA 3.0, via Wikimedia Commons.

The houses here

Eichler ceilings, HOA complexes and one-family tracts

Mountain View's housing runs from 1950s ranch and Eichler tracts to townhouse complexes and six mobile home parks, and each meets an electrical job differently. In the Monta Loma Eichlers the roof deck is the ceiling, with no attic above it, so a new circuit for a heat pump or a charger travels along the surface, under the eaves or through the roof rather than being fished overhead. A townhouse or condo governed by a homeowners association needs the association's signed authorization before the city accepts an application, and the online permits are closed to work in common areas. A detached one-family house is where the 200-amp minimum bites hardest, because it applies the moment a load calculation says the old panel cannot carry what is being added.

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Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.

Permits and local rules

Mountain View code sections behind the electrical work

  • City Code Section 8.51 and the 200-amp minimum

    The Building Division's online permit rules cite Mountain View City Code Section 8.51(C) and (D): a minimum 200-amp service disconnect for a one-family dwelling and 125 amps for other dwellings. They apply it whenever an existing panel is too small for added load, whether that load is an air conditioner, a heat pump, a heat pump water heater or an EV charger. The panel upgrade itself requires a utility release inspection, after which the inspector's release form goes to PG&E to reconnect the house.

    City of Mountain View Building Division (opens in a new tab)

  • Ordinance No. 9.2025, the electrification reach code

    On September 9, 2025, the City Council adopted local amendments to the 2025 California codes that took effect January 1, 2026. For homes they add two requirements: an air conditioner replaced on an existing single-family house becomes a heat pump, and remodels or additions that install gas or propane equipment include electrical pre-wiring for a future electric appliance. All building permits submitted on or after that date fall under the 2025 Mountain View Green Building Code.

    City of Mountain View (opens in a new tab)

  • What the reach code leaves alone

    The city's question-and-answer sheet, written with Silicon Valley Clean Energy, says nothing in the 2025 codes prevents repairing an existing air conditioner. It also says the code does not require a gas water heater to be replaced with a heat pump model, and that pre-wiring is required only where work is happening, not throughout the house. Where either requirement would trigger a panel upgrade on its own, the code offers exceptions or alternative ways to comply.

    City of Mountain View and Silicon Valley Clean Energy (opens in a new tab)

  • New outlets need a permit

    Mountain View's AFCI and GFCI guide for one- and two-family homes says a permit is required to install new receptacle outlets, obtained before work starts. The city's list of work exempt from permits includes replacing a branch-circuit breaker of the required capacity in the same location and reinstalling receptacles, but not adding outlets. New work must meet the guide's GFCI locations, from kitchens and bathrooms to garages, laundry areas and crawlspaces.

    City of Mountain View Building Division (opens in a new tab)

State license for this work: C-10 Electrical. Look up a contractor's license on the CSLB website (opens in a new tab).

Before you hire

Settle these with a Mountain View electrician first

  • Ask for the load calculation in writing; it decides whether a heat pump, charger or water heater fits the existing panel.
  • If a panel upgrade is quoted, ask whether it stays in place at 200 amps, which keeps it on the online permit.
  • Ask whether a load management system could avoid a service upgrade for an EV charger.
  • Ask who arranges PG&E's reconnection after the utility release inspection, and how long the house may be without power.
  • Check the C-10 Electrical license at cslb.ca.gov and confirm a current Mountain View business license.

Questions

Mountain View electrical questions, answered from city rules

Our central AC died. Does Mountain View make us install a heat pump instead?

On an existing single-family house, yes, if you replace it: since January 1, 2026, the reach code requires a heat pump when an air conditioner is replaced. You can still have the old unit repaired. A heat pump draws power much like the air conditioner it replaces, so the existing circuit usually works, though an electrician should confirm it.

Do we have to go to 200 amps to add an EV charger in Mountain View?

Only if the charger would exceed what your panel can carry. In that case the city accepts either an electrical load management system that keeps the total load within the panel's rating, or a panel upgrade, and an upgraded panel on a one-family house must be at least 200 amps under City Code Section 8.51(C).

Can I replace a breaker or an outlet without a permit?

Replacing a branch-circuit breaker with one of the required capacity in the same spot, and reinstalling a receptacle, are exempt. Adding a new outlet is not: Mountain View requires a permit for new receptacle outlets, and the new work must meet the arc-fault and ground-fault rules in the city's AFCI and GFCI guide.

We're putting a gas dryer in a remodeled laundry room. What does the 2026 code ask for?

The electrification reach code asks for pre-wiring for a future electric dryer in the remodeled area, so the switch later does not mean opening walls again. It does not require an electric dryer now. If that wiring alone would push the house into a panel upgrade, the code provides exceptions or alternative ways to comply.

Does the reach code force us to replace our gas water heater with an electric one?

No. The city's question-and-answer sheet on the 2025 reach codes says the heat pump requirement is triggered only by an air conditioner replacement and has nothing to do with water heating. If you choose a heat pump water heater anyway, the panel has to carry it, and the 200-amp minimum applies if it does not.

Where these facts come from

Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.

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