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Zoning certificate · Planning application

Duplex approved to replace detached garage on single-family lot

Planning staff approved, with conditions, a two-story building with a garage below and a second home above. Conditions include two street trees, a sidewalk widened to five feet and a five-foot walkway to the new unit's entrance.

ApprovedCZC26-00186Filed Aug. 17, 2026Winstead Park · 3031 N Mountain View Dr+1 related filing
Site plan for Duplex approved to replace detached garage on single-family lot
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

The owner of a single-family lot at 3031 N Mountain View Dr proposes to tear down the existing detached garage and build a new two-story building in its place. The ground floor would be a garage and the second floor a new dwelling unit, making the property a duplex. The city's planning staff approved it with conditions.

Duplex

Project name on file: 3031 N Mountain View Dr

Timeline

  1. Two days ago

    Status changed from In review to Approved

    Reported as “Approved”.

  2. Two days ago

    Review Complete: Completed

  3. Two days ago

    Planning and Zoning: Complete

  4. Two days ago

    Document added: PDS-Action Letter - PZ_ ADMINISTRATIVE APPROVAL LETTER ISSUED 10-16-2026_CZC26-00186

  5. Two days ago

    Document added: PDS-Agency Comments - ACHD 10-5-2026

  6. Two days ago

    Document added: PDS-Agency Comments - FIRE 10-9-2026

  7. Two days ago

    Document added: PDS-Agency Comments - PW HILLSIDE DRAINAGE 9-15-2026

  8. Two days ago

    Document added: PDS-Agency Comments - PARKS 10-7-2026

  9. Two days ago

    Document added: PDS-Agency Comments - PW SEWER 10-5-2026

  10. Oct. 15, 2026

    Document added: PDS-Maps and Drawings - NOTICING RADIUS MAP

  11. Oct. 15, 2026

    Document added: PDS-Legal Notice - PZ_ADMINISTRATIVE LEGAL NOTICE

  12. Oct. 14, 2026

    16 documents added

  13. Sept. 24, 2026

    Planning and Zoning: In Review

  14. Sept. 24, 2026

    Assign Reviewers: Completed

  15. Sept. 4, 2026

    Fee Payment: Payment Received

  16. Aug. 31, 2026

    Prescreen Review: Passed

  17. Aug. 31, 2026

    Prescreen Review: In Progress

  18. Aug. 31, 2026

    Prescreen Review: Corrections Required

  19. Aug. 27, 2026

    Prescreen Review: In Progress

  20. Aug. 25, 2026

    Prescreen Review: Corrections Required

  21. Aug. 17, 2026

    Prescreen Review: In Progress

  22. Aug. 17, 2026

    Application Submittal: ePlanReview

    Updated missing fields to generate ePlan case.

  23. Aug. 17, 2026

    Application filed

Documents

Site plans

  • Sheet site plan showing existing and new garage, driveway, fire pit, and electrical relocation, with general construction notes and a planning and zoning review status.

    Sept. 28, 2026 · 1 page · 130 KB · PDS-Maps and Drawings

    Download Site plan with general notes

Plans

  • Floor plan drawing for the second level, shown with general construction notes covering dimensions, fire-rated wall labeling, door hardware and code compliance.

    Sept. 28, 2026 · 1 page · 206 KB · PDS-Maps and Drawings

    Download Second floor plan
  • Exterior elevation sheet with general construction notes on materials, paint, and roof equipment, plus east and north garage elevations and material schedules.

    Sept. 28, 2026 · 1 page · 2.6 MB · PDS-Maps and Drawings

    Download Exterior elevations, garage
  • Landscape plan sheet L1 at 1 inch to 10 feet scale, prepared by Trailridge Design, LLC for a residential zoning certificate.

    Sept. 28, 2026 · 1 page · 584 KB · PDS-Maps and Drawings

    Download Landscape plan, sheet L1
  • Floor plan sheet for the main level, accompanied by general construction notes covering dimensions, fire-rated walls, door hinges and code compliance.

    Sept. 28, 2026 · 1 page · 418 KB · PDS-Maps and Drawings

    Download Main floor plan
  • Mobility plan drawing for a custom home project, showing existing bike paths, a bus stop, curb and gutter, and fire truck staging with a hammerhead turnaround.

    Sept. 28, 2026 · 1 page · 4.1 MB · PDS-Maps and Drawings

    Download Mobility plan sheet AS102
  • Cover sheet listing the garage demolition and new duplex project's zoning, setbacks, height limits, floor areas, project team and drawing index.

    Sept. 28, 2026 · 1 page · 5.0 MB · PDS-Maps and Drawings

    Download Project information and drawing index sheet

Project narrative

  • Applicant describes replacing an undersized detached garage with a garage and accessory living unit for family and caregivers, including accessibility features and a sidewalk waiver request.

    Sept. 28, 2026 · 1 page · 33 KB · PDS-Letter of Intent

    Download Letter of intent for garage replacement with accessory duplex

Decisions

Notices

  • Notice that a zoning certificate was approved to construct an additional dwelling unit for a duplex in a traditional residential zone, with an appeal deadline of Oct. 26, 2026.

    Oct. 15, 2026 · 2 pages · 847 KB · PDS-Legal Notice

    Download Notice of zoning certificate approval

Application

  • Application form for a zoning certificate for a proposed duplex on an R-1C residential parcel, with property, applicant and owner details and a submittal checklist.

    Oct. 2, 2026 · 3 pages · 202 KB · PDS-Application

    Download Zoning certificate application for duplex
  • Application to remove an existing garage and build a tandem garage with a second living area, wheelchair accessible with a lift, for grandparents or a caretaker.

    Sept. 28, 2026 · 2 pages · 160 KB · PDS-Application

    Download Zoning certificate application

Photos

Correspondence

  • ACHD found no required street improvements, supports the detached sidewalk waiver, and lists traffic impact fee, driveway approach, and right-of-way permit conditions.

    Two days ago · 3 pages · 207 KB · PDS-Agency Comments

    Download Ada County Highway District comments
  • Fire Department conditions for the proposed ADU duplex over garage: hydrant distance (600 ft limit exceeded), hydrant spacing, apparatus access, driving surface load, and garage heat detection.

    Two days ago · 2 pages · 226 KB · PDS-Agency Comments

    Download Boise Fire Department comments on ADU zoning certificate
  • Parks department comments requiring fencing, irrigation, and construction standards to protect a mature tree retained on the site during construction.

    Two days ago · 2 pages · 156 KB · PDS-Agency Comments

    Download Boise Parks and Recreation comments on tree protection
  • Public Works reviewer states no hillside or drainage conditions apply, and the project does not require a Stormwater Management Plan.

    Two days ago · 1 page · 134 KB · PDS-Agency Comments

    Download Public Works hillside and drainage comments
  • Public Works says the project must connect to the central sanitary sewer, which is available onsite, and sewer capacity fees may apply at building permit issuance.

    Two days ago · 1 page · 65 KB · PDS-Agency Comments

    Download Public Works sewer comments
  • Water utility letter stating a nearby hydrant can flow at least 1500 gallons per minute, with flows subject to change with system demand.

    Sept. 28, 2026 · 1 page · 115 KB · PDS-Other Small Docs

    Download Veolia fire flow letter

Other documents

  • Noticing radius map

    Oct. 15, 2026 · 692 KB · PDS-Maps and Drawings

  • Transmittal sheet

    Oct. 2, 2026 · 137 KB · PDS-Transmittal Agencies

  • Record summary showing a pending zoning certificate application for a duplex, with its status history, record contacts, and R-1C zoning designation.

    Sept. 28, 2026 · 2 pages · 215 KB · PDS-Other Small Docs

    Download Public record summary for zoning certificate
  • Statement of legal interest

    Sept. 28, 2026 · 221 KB · PDS-Statement of Legal Interest

  • Receipt

    Sept. 4, 2026 · 131 KB · PDS-Receipts

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