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Zoning certificate · Planning application

Detached 672-square-foot backyard home approved with conditions

The city approved a new detached accessory dwelling unit at 4 S Randall Street, behind an existing single-family home in an R-1C residential zone.

ApprovedCZC26-00246Filed Sept. 4, 2026Depot Bench · 4 S Randall St+1 related filing
Site plan for Detached 672-square-foot backyard home approved with conditions
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 new detached accessory dwelling unit at 4 S Randall Street, behind an existing single-family home in an R-1C residential zone. The one-story unit would be 672 square feet and 14 feet tall, with two bedrooms and one bathroom.

Project name on file: 4 S RANDALL ST - ADU

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-Agency Comments - PARKS AND RECREATION COMMENTS 10/5/26

  5. Two days ago

    Document added: PDS-Action Letter - ACTION LETTER 10/16/26

  6. Oct. 15, 2026

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

  7. Oct. 15, 2026

    Document added: PDS-Legal Notice - PZ_ADMINISTRATIVE LEGAL NOTICE

  8. Oct. 14, 2026

    16 documents added

  9. Oct. 14, 2026

    Status changed from On hold to In review

    Reported as “In Review”.

  10. Oct. 13, 2026

    Planning and Zoning: In Review

  11. Oct. 13, 2026

    Assign Reviewers: Completed

  12. Oct. 2, 2026

    Review Complete: Corrections Required

  13. Oct. 1, 2026

    Planning and Zoning: Corrections Required

  14. Sept. 24, 2026

    Planning and Zoning: In Review

  15. Sept. 24, 2026

    Assign Reviewers: Completed

  16. Sept. 4, 2026

    Fee Payment: Payment Received

  17. Sept. 4, 2026

    Prescreen Review: Passed

  18. Sept. 4, 2026

    Prescreen Review: In Progress

  19. Sept. 4, 2026

    Application Submittal: ePlanReview

  20. Sept. 4, 2026

    Application filed

Documents

Site plans

Plans

  • Front, left, right and rear building elevations plus a wall section, with exterior ventilation notes and final drawings at revision A.

    Sept. 24, 2026 · 1 page · 500 KB · PDS-Maps and Drawings

    Download Building elevations and wall section
  • Building sketch showing first-floor layout with rooms and a 1,027 sq ft living area, plus a 127.5 sq ft concrete patio, dated Sept. 4, 2026.

    Sept. 24, 2026 · 1 page · 2.0 MB · PDS-Maps and Drawings

    Download Floor plan sketch with area calculations
  • A floor plan drawing dated 9/4/2026, filed with a zoning certificate application; the extracted text shows only design firm and institute logos, with no readable dimensions or notes.

    Sept. 24, 2026 · 1 page · 823 KB · PDS-Maps and Drawings

    Download Floor plan

Project narrative

  • Treeline Design Build requests zoning compliance approval for a single-story, 672 sq. ft. detached accessory dwelling unit with two bedrooms and one bathroom.

    Sept. 24, 2026 · 1 page · 110 KB · PDS-Letter of Intent

    Download Letter of intent for detached accessory dwelling unit

Decisions

Notices

Application

Photos

  • Four photographs of the site, with no readable captions or text describing what they show.

    Sept. 24, 2026 · 4 pages · 21.3 MB · PDS-Photos

    Download Site photos

Correspondence

  • Boise Parks and Recreation reviewed the proposal with Community Forestry and has no comments, finding no impact to existing mature trees on the site.

    Two days ago · 1 page · 57 KB · PDS-Agency Comments

    Download Parks and Recreation comments
  • ACHD finds no adjacent street improvements required and lists conditions: traffic impact fee, driveway approach permit, right-of-way permits, and standard conditions of approval.

    Sept. 29, 2026 · 3 pages · 166 KB · PDS-Agency Comments

    Download Ada County Highway District comments
  • Public Works reviewer found no comment and noted the project does not meet Stormwater Management Plan or other hillside and drainage conditions.

    Sept. 29, 2026 · 1 page · 134 KB · PDS-Agency Comments

    Download Hillside and drainage comments
  • The Boise Fire Department has no comments on the zoning certificate application, noting that IBC, IFC and Boise City Code provisions will apply at building permit stage.

    Sept. 29, 2026 · 1 page · 151 KB · PDS-Agency Comments

    Download Boise Fire Department comments
  • Public Works states the property must connect to the central sanitary sewer, and that sewer capacity fees may be due when the building permit is issued.

    Sept. 29, 2026 · 1 page · 65 KB · PDS-Agency Comments

    Download Public Works sewer comments
  • Veolia Water says the ADU needs a separate water service line and meter, and requires a site plan submitted for review before approval.

    Sept. 29, 2026 · 1 page · 237 KB · PDS-Agency Comments

    Download Veolia Water Idaho comments
  • Veolia Water Idaho provides water pressure and flow availability at a nearby hydrant for fire sprinkler design under maximum-day conditions.

    Sept. 24, 2026 · 1 page · 112 KB · PDS-Other Small Docs

    Download Water company fire flow information

Other documents

  • Noticing radius map

    Oct. 15, 2026 · 651 KB · PDS-Maps and Drawings

  • Transmittal sheet

    Sept. 25, 2026 · 137 KB · PDS-Transmittal Agencies

  • Statement of legal interest

    Sept. 24, 2026 · 221 KB · PDS-Statement of Legal Interest

  • Receipt

    Sept. 4, 2026 · 130 KB · PDS-Receipts

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