# Planned developments in Mercer Island, WA

Boardwalk found 28 planned projects in Mercer Island, WA in public filings from the last 12 months. The latest is on the Mercer Island Hearing Examiner agenda for Sep 10, 2026.

Data as of Oct 11, 2026. Updated monthly. Page: https://boardwalkai.com/development/washington/mercer-island/

## Mercer Island at a glance

| Measure | Value |
|---|---|
| Projects, last 12 months | 28 |
| New in the last 30 days | 0 |
| Most common type | Institutional/Public |
| Latest filing | Sep 10, 2026, Mercer Island Hearing Examiner |
| Sources we check | 15 |

Last 12 months, duplicates merged. Includes private, public, and small jobs. How we count: https://boardwalkai.com/coverage/#how-we-count

## What's planned in Mercer Island

By type, last 12 months.

| Type | Projects | Share |
|---|---|---|
| Public and institutional | 10 | 36% |
| Infrastructure | 8 | 29% |
| Residential | 4 | 14% |
| Development decisions | 3 | 11% |
| Commercial | 3 | 11% |

## Recent projects in Mercer Island

| Project | Developer | Type | Size | Stage | Latest meeting |
|---|---|---|---|---|---|
| 1,180-SF Narthex Expansion and Church Renovation | Encounter Eastside Church | Places of worship | Not stated in filing | Seeking approval | Sep 2, 2026 |
| $400K Water System Improvements Project Acceleration | Not stated | Utilities | Not stated in filing | Approved | Jul 21, 2026 |
| $205K City Hall Demolition Design and Permitting Appropriation | Not stated | Government offices | Not stated in filing | Approved | Jul 21, 2026 |
| $500K Grant Application for Deane's Children's Park Improvements | Not stated | Parks | Not stated in filing | Approved | Jul 7, 2026 |
| $408K Island Crest Way Corridor Improvements | Not stated | Transportation | Not stated in filing | In design | May 1, 2026 |
| City Hall Facility Full Renovation | Not stated | Government offices | Not stated in filing | Approved | Apr 7, 2026 |
| Water Supply Pipeline Phase 2 Design Contract Approval | Not stated | Pipelines | Not stated in filing | Approved | Apr 7, 2026 |
| 13,753-Sqft Marina Reconfiguration and Replacement | Mercer Island Beach Club | Entertainment and recreation | Not stated in filing | Approved | Jan 23, 2026 |
| Rezone of Two City-Owned Properties to Public Institution | Not stated | Institutional/Public | Not stated in filing | Seeking approval | Dec 2, 2025 |
| PreK-8 School and Office Building with Site Improvements | Not stated | Schools | Not stated in filing | Seeking approval | Oct 31, 2025 |
| Water Supply Pipeline Project Update | Not stated | Pipelines | Not stated in filing | In design | Oct 21, 2025 |
| Water Supply Line Infrastructure Improvements | Shorewood Apartments | Utilities | Not stated in filing | Early planning | Feb 4, 2025 |

Showing 12 of 28 projects. A free trial opens the full records and documents.

Samples show projects filed by companies or public bodies.

## Nearby places

- Beaux Arts Village, WA · 9 projects
- [Bellevue, WA](https://boardwalkai.com/development/washington/bellevue/) · 70 projects
- [Newcastle, WA](https://boardwalkai.com/development/washington/newcastle/) · 34 projects
- Medina, WA · 38 projects
- [Clyde Hill, WA](https://boardwalkai.com/development/washington/clyde-hill/) · 160+ projects
- Hunts Point, WA · 1 project

All places in Washington: [Washington](https://boardwalkai.com/development/washington/)

## Questions about Mercer Island

### What's planned in Mercer Island, WA?

Boardwalk found 28 planned projects in Mercer Island, WA in the last 12 months. The latest is on the Mercer Island Hearing Examiner agenda for Sep 10, 2026.

### Where does this data come from?

Boardwalk's Mercer Island projects come from public meeting records, such as Mercer Island Hearing Examiner agendas and minutes. Each one links to the original filing.

### How current is it?

Boardwalk checks Mercer Island's public records at least once a week; the last check was Oct 12, 2026. These counts are as of Oct 11, 2026 and refresh monthly.

### Can I get an Alert for new Mercer Island projects?

Yes, a Boardwalk Alert emails you new Mercer Island projects daily, weekly, or monthly. Start with a 7-day free trial, no credit card needed.

## Get the full data

- **Count for free.** Connect Boardwalk to Claude or ChatGPT and ask how many projects match. Counting is free during your trial and on every plan. [Use it in Claude or ChatGPT](https://boardwalkai.com/mcp/)
- **Open the records.** Start a 7-day free trial, no credit card. It includes 50 project records. [Start free trial](https://boardwalkai.com/auth/signup/)
- **Use it in your tools.** CSV export, the API, and the MCP server come with every plan. [API docs](https://boardwalkai.com/docs/api/)
- **Download these numbers.** [mercer-island.json](https://boardwalkai.com/data/places/washington/mercer-island.json) · [mercer-island.md](https://boardwalkai.com/development/washington/mercer-island/index.md)

## How to cite

Source: Boardwalk, "Planned developments in Mercer Island, WA", boardwalkai.com/development/washington/mercer-island/, data as of Oct 11, 2026.

How we count: https://boardwalkai.com/coverage/#how-we-count