Washington State has no outright natural gas ban. Instead, the state uses building code credit penalties, utility planning mandates, and carbon pricing to make gas impractical in new construction while leaving existing gas service in homes and businesses untouched. A voter initiative that tried to unwind much of this framework, Initiative 2066, was struck down in 2025 and is now before the Washington Supreme Court, so parts of the picture could still shift.
The Energy Code Is the Real Restriction
The 2021 Washington State Energy Code does not prohibit gas equipment. It uses a credit system that makes choosing gas so expensive on paper that most builders drop it. Every new building must earn a minimum number of energy efficiency credits at permitting, and the permit application has to identify each selected option and its point value.1Washington State Building Code Council. 2021 Washington State Energy Code – Residential Provisions
For residential construction, required credits range from 5.0 for dwelling units under 1,500 square feet to 9.0 for homes over 5,000 square feet. Medium homes need 8.0 credits and Group R-2 multifamily units need 6.5. The code sets a “carbon emission equalization” baseline that changes point values depending on whether the building uses gas or electric as its base fuel, so picking gas makes the credit math significantly harder.1Washington State Building Code Council. 2021 Washington State Energy Code – Residential Provisions
Commercial construction is where the penalty becomes prohibitive. Buildings using the fossil fuel compliance path must earn large numbers of additional credits on top of the standard requirement. Fossil-fuel water heating in a Group R-2 apartment building triggers 212 extra credits. An office building using gas for space heating faces 101 additional credits, and a retail building using gas for space heating faces 111. Most commercial developers find the all-electric path dramatically cheaper.2Washington State Building Code Council. 2024 Washington State Energy Code – Commercial Provisions First Draft
Gas remains technically permitted through the fossil fuel compliance path. In practice, that path functions as a de facto ban for most projects, and nearly every new commercial building and most new homes in Washington are now designed all-electric. A draft update to the commercial code takes effect November 1, 2026 and keeps the same structure, so the credit-based deterrent is not going away.2Washington State Building Code Council. 2024 Washington State Energy Code – Commercial Provisions First Draft
HB 1589 and the Utility Side
House Bill 1589, signed in 2024, targets the delivery side of natural gas. It requires large combination utilities that provide both gas and electricity to file integrated system plans, which in practice means Puget Sound Energy, the state’s largest multi-fuel utility. The law requires PSE to plan for the long-term future of its gas infrastructure alongside its electric operations.3Washington State Legislature. HB 1589 – 2023-24
A key provision allows a utility to consolidate its gas and electric rate bases, treating both systems as one financial entity. That change simplifies shifting investment from gas pipelines toward electric capacity. HB 1589 also prohibited utilities from offering rebates or incentives for new gas appliances and from marketing gas as a preferred energy source, and it directed the Utilities and Transportation Commission to pursue cost-effective electrification of gas-served end uses.
Separately, Washington regulators have shifted how the cost of new gas connections gets allocated. Utilities traditionally spread the expense of new gas lines across all existing ratepayers through line extension allowances. Recent changes push those costs onto the developer or homeowner requesting the connection. Paying the full cost of trenching, pipe, and connection changes the economics of choosing gas over electric sharply, especially for a single new home.
Where Gas Is Still Allowed
Nothing in current law requires you to remove a working gas furnace, water heater, stove, or fireplace from an existing home or business. Existing gas connections remain active. The pressure arrives when that equipment fails and you have to choose a replacement that meets current code and efficiency requirements.
Commercial kitchens are the clearest carve-out for new gas equipment. The 2021 energy code recognizes gas cooking appliances across duty categories, including heavy-duty gas broilers and open-burner ranges, medium-duty gas griddles and fryers, and light-duty gas ovens. For facilities where commercial kitchen equipment is the primary business function, the code requires at least one gas or electric fryer as part of its efficiency measures.4WA Energy Codes. Commercial Kitchen Air Systems
The commercial code also lets builders reduce the fossil fuel credit penalty through a formula tied to the ratio of exempt equipment to total heating capacity. A restaurant with gas cooking but electric space and water heating can reasonably include gas without drowning in compliance credits.
Initiative 2066 and What the Supreme Court Could Change
In November 2024, Washington voters approved Initiative 2066, which aimed to roll back most of the state’s gas restrictions. The measure prohibited state and local governments from restricting access to natural gas, barred the Building Code Council from penalizing or discouraging gas use in buildings, and repealed sections of HB 1589 that required utilities to plan for electrification of gas customers.5Ballotpedia. Washington Initiative 2066, Natural Gas Policies Measure 2024
I-2066 also struck the requirement that the UTC “achieve all cost-effective electrification of end uses currently served by natural gas,” repealed the prohibition on gas rebates and incentives, and added new language preventing cities, towns, and counties from “in any way” prohibiting, penalizing, or discouraging gas use for heating or appliances in any building.6Washington Secretary of State. Initiative Measure No. 2066 Full Text
In March 2025, a King County Superior Court judge ruled I-2066 unconstitutional, finding it violated the state constitution’s single-subject rule for voter initiatives. A written order followed in May 2025. In September 2025, the Washington Supreme Court agreed to hear the case on direct review. Until that court rules, the pre-I-2066 framework largely remains in effect.
The court’s decision matters in specific ways. If it upholds the lower court and I-2066 stays struck down, HB 1589’s utility planning requirements, the prohibitions on gas incentives and marketing, and the bar on local gas restrictions all survive. If the court reinstates I-2066, utilities regain the ability to promote gas, the electrification planning mandate disappears, and cities lose the ability to adopt their own gas restrictions.
One thing the court fight will not change: the energy code credit system. Those penalties sit in the building code independently, and they would remain even if I-2066 were fully reinstated. For anyone building new, the all-electric design path stays significantly easier to permit either way.
Existing Large Buildings: The Clean Buildings Standard
Existing commercial and large multifamily buildings face separate pressure through the Clean Buildings Performance Standard under RCW 19.27A.210. The standard sets energy use intensity (EUI) targets by building type. Buildings that miss their target must identify and implement cost-effective efficiency measures.7Washington State Department of Commerce. Clean Buildings Performance Standard
The standard does not ban gas equipment in existing buildings. It sets a performance benchmark that gas-heavy buildings often struggle to meet, which creates indirect pressure to replace older gas boilers and furnaces when the time comes for major renovation or equipment turnover.
Tier 1 buildings, over 50,000 gross square feet of nonresidential, hotel, motel, or dormitory space, face staggered deadlines:7Washington State Department of Commerce. Clean Buildings Performance Standard
- June 1, 2026: buildings over 220,000 square feet
- June 1, 2027: buildings 90,000 to 220,000 square feet
- June 1, 2028: buildings 50,000 to 90,000 square feet
Tier 2 buildings cover nonresidential buildings 20,000 to 50,000 square feet and multifamily residential buildings over 20,000 square feet. Their compliance deadline is July 1, 2027.7Washington State Department of Commerce. Clean Buildings Performance Standard
Penalties for missing deadlines are real. Tier 1 buildings face a maximum of $5,000 plus up to $1 per square foot per year, accumulating for up to 18 months. Tier 2 buildings face up to $0.30 per square foot for failing to demonstrate compliance.8Washington State Legislature. SB 5514 – Clean Buildings If you own or manage a covered building, tracking your EUI numbers now is the right move.
The Cost of Gas Itself Is Going Up
Washington’s 2021 Climate Commitment Act adds a separate cost layer to natural gas. The cap-and-invest program covers fuel suppliers and gas utilities, requiring them to acquire emission allowances that raise the delivered cost of fossil fuels. Voters rejected Initiative 2117, which would have repealed the program, in November 2024.9Ballotpedia. Washington Initiative 2117, Prohibit Carbon Tax Credit Trading and Repeal Carbon Cap-and-Invest Program Measure 2024
With that program intact, gas prices in Washington carry a carbon compliance premium that electric heating avoids on a grid dominated by hydroelectric power. As emission caps tighten, the gap is expected to widen.
Money for Switching to Electric
Federal programs help offset the cost of replacing gas equipment with electric. The federal Energy Efficient Home Improvement Credit provides a tax credit of up to $2,000 per year for qualifying heat pump installations.10Internal Revenue Service. Energy Efficient Home Improvement Credit The credit was expanded by the Inflation Reduction Act and is scheduled to remain available through 2032. Verify current eligibility with the IRS before filing.
The federal High-Efficiency Electric Home Rebate Act (HEEHRA) offers point-of-sale rebates for lower-income households. Under federal guidelines, qualifying households can receive up to $8,000 for a heat pump air conditioner or heater and up to $1,750 for a heat pump water heater, with a maximum of $14,000 across all eligible upgrades. HEEHRA is administered state by state, and program availability depends on Washington’s launch status and continued federal funding. As of late 2025, some state programs had paused enrollment due to federal funding uncertainty. Check with the Washington State Department of Commerce for the current status before planning a purchase around a rebate.