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Zoning certificate · Planning application

Attached 749-square-foot backyard-style apartment approved for single-family home

The city approved a one-story, one-bedroom accessory dwelling unit attached to an existing house, with conditions: a paved path at least 4 feet wide to its entrance, drainage kept on site, and limited exterior construction hours. The decision is dated Aug. 14.

ApprovedCZC26-00100Filed April 27, 2026Southwest Boise · 2551 S Sumpter Way+1 related filing
Site plan for Attached 749-square-foot backyard-style apartment approved for single-family home
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 city approved a 749-square-foot, one-bedroom, one-bathroom accessory dwelling unit attached to an existing single-family home at 2551 S Sumpter Way in Boise. The addition is a single story and sits in a large-lot residential zone.

Project name on file: 2551 S SUMPTER WAY

Timeline

  1. Aug. 25, 2026

    Appeal Period: Completed

  2. Aug. 14, 2026

    Review Complete: Completed

  3. Aug. 14, 2026

    Planning and Zoning: Complete

  4. Aug. 14, 2026

    Planning and Zoning: In Review

  5. Aug. 14, 2026

    Assign Reviewers: Completed

  6. July 15, 2026

    Review Complete: Corrections Required

  7. July 14, 2026

    Planning and Zoning: Corrections Required

  8. June 30, 2026

    Planning and Zoning: In Review

  9. June 30, 2026

    Assign Reviewers: Completed

  10. June 30, 2026

    Fee Payment: Payment Received

  11. June 30, 2026

    Prescreen Review: Passed

  12. June 26, 2026

    Prescreen Review: In Progress

  13. June 2, 2026

    Prescreen Review: Corrections Required

  14. May 29, 2026

    Prescreen Review: In Progress

  15. April 27, 2026

    Application Submittal: ePlanReview

  16. April 27, 2026

    Application filed

Documents

Site plans

  • Revised site plan showing property lines, setbacks, easements, electrical conduit and transformer locations, and general construction notes for a zoning certificate.

    Aug. 10, 2026 · 1 page · 5.3 MB · PDS-Maps and Drawings

    Download Site plan, version 2
  • FEMA determination removing the subject property from the Special Flood Hazard Area on the effective flood map, so federal flood insurance is not mandatory.

    July 14, 2026 · 4 pages · 106 KB · PDS-Other Small Docs

    Download FEMA Letter of Map Revision based on fill determination
  • Site plan for a proposed 749 sq ft attached accessory dwelling unit, showing setbacks, easements, existing structures, trees and general construction notes for a zoning certificate.

    July 13, 2026 · 1 page · 6.5 MB · PDS-Maps and Drawings

    Download Site plan for attached accessory dwelling unit

Plans

  • Architectural drawing sheets for an attached accessory dwelling unit showing north and east elevations, a proposed demo plan and a foundation ventilation calculation, with the sheets marked for demolition of existing…

    Aug. 10, 2026 · 3 pages · 2.3 MB · PDS-Maps and Drawings

    Download Existing and proposed elevations, demo plan (version 2)
  • Floor plan sheet with door and window schedules, ventilation and illumination calculations, and general building notes.

    Aug. 10, 2026 · 1 page · 1.8 MB · PDS-Maps and Drawings

    Download Floor plan, version 2
  • Site plan showing existing trees, driveway, gravel and paver areas to remain, and proposed ADU landscaping, with general construction notes on site verification and storm water protection.

    Aug. 10, 2026 · 1 page · 6.2 MB · PDS-Maps and Drawings

    Download Landscape plan, version 2
  • Cover page of the drawing set with general notes, abbreviations, sheet index and project team for the June 30, 2026 zoning certificate application.

    July 13, 2026 · 10 pages · 15.8 MB · PDS-Maps and Drawings

    Download Cover sheet for zoning certificate drawings
  • Floor plan sheet listing door and window schedules, ventilation and illumination calculations, and general construction notes for the zoning certificate.

    July 13, 2026 · 1 page · 6.3 MB · PDS-Maps and Drawings

    Download Floor plan with door, window and ventilation schedules
  • Elevation drawing sheet with scales and general construction notes on air sealing, under-floor access, emergency escape openings and glazing hazard locations.

    July 13, 2026 · 2 pages · 2.2 MB · PDS-Statement of Legal Interest

    Download Building elevations with general notes

Project narrative

  • Applicant's explanation of a proposed single-story attached accessory dwelling unit of about 743 to 749 square feet, with one bedroom, and how it meets ADU, setback and easement standards.

    July 13, 2026 · 2 pages · 139 KB · PDS-Letter of Intent

    Download Letter of intent for attached ADU zoning certificate

Decisions

Notices

  • Approval notice for a zoning certificate allowing an attached accessory dwelling unit on a 0.31-acre R-1A lot, with an appeal deadline of Aug. 24, 2026.

    Aug. 12, 2026 · 2 pages · 900 KB · PDS-Legal Notice

    Download Notice of approval

Application

  • Application for a 749 sq ft accessory dwelling unit with two bedrooms, filed by an applicant for a single-family property in an R-1A zone, with a submittal checklist.

    April 27, 2026 · 3 pages · 205 KB · PDS-Application

    Download Zoning certificate application for accessory dwelling unit

Photos

  • A set of ten site photographs dated June 30, 2026, filed with the zoning certificate application; the text contains no further descriptive content.

    July 13, 2026 · 10 pages · 15.3 MB · PDS-Photos

    Download Site photos

Correspondence

  • ACHD finds no adjacent street improvements required and lists traffic impact fee, driveway approach permit, and right-of-way permit conditions, plus standard conditions of approval.

    July 20, 2026 · 3 pages · 166 KB · PDS-Agency Comments

    Download Ada County Highway District comments
  • The Boise Fire Department reports no comments on the zoning certificate review, noting building code requirements to be addressed at the building permit stage.

    July 20, 2026 · 1 page · 151 KB · PDS-Agency Comments

    Download Boise Fire Department comments
  • Public Works states central sanitary sewer connection is required at development, notes possible sewer capacity fees at building permit issuance, and conditions final sewer plan approval.

    July 15, 2026 · 1 page · 65 KB · PDS-Agency Comments

    Download Public Works sewer comments
  • Veolia Water Idaho reports available water pressure and flow at a nearby hydrant for fire sprinkler design, to be attached to architectural plan sets.

    July 13, 2026 · 1 page · 112 KB · PDS-Other Small Docs

    Download Veolia water pressure and fire flow letter
  • Email asking the city to replace the listed applicant on the zoning certificate with a construction company representative, with the contact details provided.

    April 28, 2026 · 1 page · 291 KB · PDS-Correspondence

    Download Request to change applicant contact information

Other documents

  • Noticing radius map

    Aug. 12, 2026 · 640 KB · PDS-Maps and Drawings

  • Transmittal to review agencies

    July 14, 2026 · 131 KB · PDS-Transmittal Agencies

  • Statement of legal interest

    July 13, 2026 · 206 KB · PDS-Statement of Legal Interest

  • Receipt

    June 30, 2026 · 135 KB · PDS-Receipts

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