Conditional use · Planning application

Triplex proposed to replace garage on lot with existing duplex

The 3,155-square-foot, two-story building would add three homes and four parking spaces, and one mature tree would be removed. The permit request is on hold after the city returned it to the applicant.

On holdCUP26-00030Filed Aug. 20, 2026Veterans Park · 4101 W Plum St+2 related filings

Site plan for Triplex proposed to replace garage on lot with existing duplex — Site plan from the application documents.

Pin at the reported location; the shaded outline is the primary parcel (Ada County).

From the filing

The application's description as it appears in City of Boise's record. See the official record

Adding an additional dwelling to existing Duplex
Project name on file: 4101 W PLUM ST

Timeline

Oct. 15, 2026
Document added: PDS-Agency Comments - ACHD AGENCY COMMENTS 10/15/2026
Oct. 14, 2026
12 documents added
Oct. 9, 2026
Review Complete: Corrections Required
Oct. 6, 2026
Planning and Zoning: Corrections Required
Sept. 29, 2026
Planning and Zoning: In Review
Sept. 29, 2026
Assign Reviewers: Completed
Aug. 24, 2026
Fee Payment: Payment Received
Aug. 21, 2026
Prescreen Review: Passed
Aug. 21, 2026
Prescreen Review: In Progress
Aug. 21, 2026
Prescreen Review: Corrections Required
Aug. 20, 2026
Prescreen Review: In Progress
Aug. 20, 2026
Application Submittal: ePlanReview
Aug. 20, 2026
Application filed

Documents

Plans

Four-side exterior elevation drawings for a new triplex, showing heights, materials and colors such as gray horizontal siding, white trim and black composite shingles.
Sept. 29, 2026 · 1 page · 460 KB · PDS-Maps and Drawings
Download Building elevations, northeast, southeast, northwest and southwest
First and second floor plans for a three-unit residential building, showing layouts for bedrooms, kitchen, bath, laundry, garage and covered parking, with square footage totals.
Sept. 29, 2026 · 1 page · 84 KB · PDS-Maps and Drawings
Download Floor plans for new triplex
Title sheet combined with site and landscape plan showing lot coverage, open space, tree retention and removal, xeriscaping, and parking for a proposed triplex with garage.
Sept. 29, 2026 · 1 page · 1.7 MB · PDS-Maps and Drawings
Download Landscape plan and site plan for new triplex

Project narrative

Architect's letter describing a proposed 3,155 square foot triplex beside an existing duplex, with four parking spaces, cementitious siding, and removal of one mature tree.
Sept. 29, 2026 · 1 page · 71 KB · PDS-Letter of Intent
Download Letter of intent for conditional use permit

Application

Application to add a dwelling to an existing duplex in the R-2 zone, converting the site to a tri-plex after demolishing an existing garage.
Aug. 20, 2026 · 9 pages · 308 KB · PDS-Application
Download Conditional use permit application

Photos

Existing site plan marked with photo locations, showing trees, grass, driveway, garage demolition and property lines for the conditional use permit.
Sept. 29, 2026 · 1 page · 556 KB · PDS-Photos
Download Existing site photos with plan

Correspondence

ACHD finds no adjacent street improvements required, and lists traffic impact fee, driveway approach, right-of-way permit and standard irrigation and utility conditions.
Oct. 15, 2026 · 3 pages · 206 KB · PDS-Agency Comments
Download Ada County Highway District comments
Letter to the applicant scheduling the conditional use permit for the Nov. 9, 2026 Planning and Zoning Commission hearing, with site posting and agency comment deadlines.
Oct. 13, 2026 · 1 page · 106 KB · PDS-Correspondence
Download Notice of the Nov. 9 Planning and Zoning Commission hearing
Veolia Water Idaho reports available water pressure and flow at a nearby hydrant for fire sprinkler design, under maximum-day conditions.
Sept. 29, 2026 · 1 page · 113 KB · PDS-Other Small Docs
Download Veolia water fire flow information

Triplex proposed to replace garage on lot with existing duplex

From the filing

Timeline