Initiative 2066|
|
|
|
| 
| Choice | Votes | % |  
| Yes | 1,941,474 | 51.71% |  
| No | 1,813,169 | 48.29% |  |
 
| Total votes | 3,754,643 | 100.00% |  |
 | 
| 
 | 
| Congressional district results
 
| Yes   90–100%    80–90%    70–80%    60–70%    50–60%  | No   90–100%    80–90%    70–80%    60–70%    50–60%  | Other   Tie    No data    |  | 
| Source: Canvass of the Returns at the Wayback Machine (archived February 14, 2025) | 
Washington Initiative Measure No. 2066 (I-2066) was a popular referendum that was decided on November 5, 2024. The initiative was placed on the ballot by a coalition of organizations led by the Building Industry Association of Washington, a Tumwater-based non-profit organization representing an array of organizations in the homebuilding industries. The initiative was started in response to changes to the state's building codes which were intended to provide incentives for buildings to move away from natural gas as a source of heating. Initiative 2066 was approved by the voters following the November 5th, 2024 general election.