Green Building and Electrification

Across California, jurisdictions are looking to reduce natural gas use and are heading towards an all-electric future. Using electric appliances in homes improves indoor air quality, reducing GHG emissions, and saves residents money on utility bills over time.

The City worked with the County of Marin and other local stakeholders to develop model Green Building “reach codes,” that go beyond State codes to increase energy efficiency and reduce greenhouse gas emissions. In December 2022, the City adopted a requirement for most new construction to be all-electric by prohibiting the use of natural (methane) gas in new construction. You can find the building code here.  In addition, one provision disallows extending or increasing gas lines and meters in existing single-family homes and duplexes. The City has temporarily paused enforcement. However, we strongly encourage applicants to eliminate gas in new construction to avoid having stranded assets since the State is moving toward an all-electric future.

Future actions include the development of codes that address reductions in energy in existing homes (coming in 2024) and the creation of a resources to help building owners and contractors (see below). To further electrification efforts, the County of Marin launched Electrify Marin, a countywide rebate program to reduce natural gas use in homes by providing incentives to homeowners in Marin to replace existing natural gas water heaters, furnaces, and stoves with high-efficiency electric alternatives.


We know how hard it is to figure out where to start. So, we created these resources below to find more technical support, guides, and rebates and incentives, including a new 8-Step Guide to Electrify Your Home for homeowners. Check them out below and let us know if you have any feedback!

For more detailed information and resources on electrification and energy efficiency, refer to the California Energy Commission's Building and Home Energy Resource Hub.


  1. Where can I find the CalGreen checklists?
  2. How do I calculate my load to see if I have enough electricity for electrifying?
    • Refer to pages 15-18 of this Electrify Everything Guide from Rewiring America, with additional panel calculation resources listed on page 18. Redwood Energy also has a great Watt Calculator for assessing your real need for electricity: panel upgrades are not always necessary.
  3. How do I find a contractor?
    • Check out sources such as Switch Is On that have lists of contractors nearby.
  4. How do I find out about incentives, rebates and technical assistance for my project?
    • Most rebates and technical assistance can be found at Also refer to our links above for other resources based on project or appliance types.

For more frequently asked questions, please see the County of Marin’s comprehensive building electrification FAQ Sheet.

New construction and most remodels must follow the California Green Building Standards Code (CalGreen) requirements set by the state. CalGreen checklists can be found here: CA Building Standards – CALGreen 

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