Introduction

King County is inviting local governments in King, Kitsap, Pierce, and Snohomish Counties that are interested in applying for a Building Decarbonization Grant to submit a Letter of Interest (LOI) form.

Letter of Interest forms will be reviewed on a rolling basis. The deadline to submit an LOI form is January 12, 2026 at 11:59pm Pacific Time. Eligible entities are encouraged to submit Letter of Interest forms sooner rather than later.

Entities that have submitted an LOI form will be notified of the outcome within 3-5 weeks of submission. Outcomes include:

• This project qualifies and you are invited to submit a full application.
• This project qualifies and is in a priority geography; you are invited and encouraged to submit a full application.
• This project mostly qualifies, however there are some ineligible activities or other issues with the project; you are invited to submit a full application, noting that there are revisions needed to ensure all activities are eligible.
• Not invited to submit a full application (due to ineligible building types, activities, etc.).
• For LOIs that are turned down due to ineligibility, applicants are free to submit another LOI so long as it's within the LOI submission window (Nov 10, 2025 - Jan 12, 2026).

In addition to notification of LOI outcome, entities requesting pre-application technical assistance will receive information about the next steps in that technical assistance selection process.

The LOI form includes:

• Background and screening questions such as contact information and basic information about the building(s) (heating system fuel type, building age, etc.)
• Very short narrative responses to questions related to proposed project scope, impact, and budget. (100-word limit for each question.)

A PDF of the Letter of Interest form questions is located here to support eligible entities working through the process.

Note: The Letter of Interest form includes a few questions related to building characteristics, systems, and operations. If you have questions about how to obtain such information, please contact your facilities management department or capital projects team. If you’re not able to gain the requisite information from them, please contact King County staff for support at CPRG@kingcounty.gov. Please include “Local Govt Grant” in the subject line.

For additional information about eligibility and program structure, please return to the program website.

If you’re applying for funds to support retrofits on a portfolio of buildings, please complete the Building Information Spreadsheet. The spreadsheet template includes a column for each of the building-related LOI form questions. Please include one building per spreadsheet row and do not change the format or structure of the template.

Be sure to add your first initial and last name to the file name.

Upload the spreadsheet in the box below when complete.

Technical assistance to support the development of a full grant application is available on a very limited basis for high-need, low-capacity local governments that are applying for funds to retrofit a building(s) in frontline communities. King County anticipates being able to support up to five (5) applicants with such technical assistance.

Public Records Disclaimer 

I acknowledge that this LOI form, and all information contained herein, is a public record and may be subject to disclosure. 

Attestation

I attest that the information provided in this LOI form is true and accurate to the best of my knowledge.