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Zoning certificate · Planning application

Approved: 495-square-foot backyard accessory unit in Boise

The city approved a one-story detached accessory dwelling unit with one bedroom, set 12 feet from the rear property line, with conditions requiring a five-foot paved path to its entrance and limiting exterior construction hours.

ApprovedCZC25-00229Filed Feb. 25, 2026West Valley · 2946 N Gretchen Way+1 related filing
Site plan for Approved: 495-square-foot backyard accessory unit in Boise
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 zoning certificate for a one-story detached accessory dwelling unit of 495 square feet with one bedroom, built behind the existing single-family house at 2946 N Gretchen Way in Boise's R-1C residential zone. The building would sit 12 feet from the rear property line, and the approval requires a five-foot-wide paved path from the unit's entrance to the driveway.

ADU

Project name on file: 2946 N GRETCHEN WAY

Timeline

  1. June 16, 2026

    Appeal Period: Completed

  2. June 5, 2026

    Review Complete: Completed

  3. June 5, 2026

    Current Planning: Complete

  4. May 28, 2026

    Current Planning: In Review

  5. May 28, 2026

    Assign Reviewers: Completed

  6. May 27, 2026

    Review Complete: Corrections Required

  7. May 27, 2026

    Current Planning: Corrections Required

  8. May 22, 2026

    Current Planning: In Review

  9. May 22, 2026

    Assign Reviewers: Completed

  10. April 29, 2026

    Review Complete: Corrections Required

  11. April 29, 2026

    Current Planning: Corrections Required

  12. April 23, 2026

    Current Planning: In Review

  13. April 23, 2026

    Assign Reviewers: Completed

  14. April 21, 2026

    Review Complete: Corrections Required

  15. April 15, 2026

    Current Planning: Corrections Required

  16. April 13, 2026

    Current Planning: In Review

  17. April 13, 2026

    Assign Reviewers: Completed

  18. April 7, 2026

    Fee Payment: Payment Received

  19. April 7, 2026

    Prescreen Review: Passed

  20. April 6, 2026

    Prescreen Review: In Progress

  21. Feb. 25, 2026

    Application Submittal: ePlanReview

  22. Feb. 25, 2026

    Application filed

Documents

Site plans

  • Revised site plan dated 5-28-26 for a zoning certificate application; the page text is mostly garbled, so the drawing's details can't be confirmed.

    May 30, 2026 · 1 page · 4.2 MB · PDS-Maps and Drawings

    Download Revised site plan
  • One-page site plan drawing for the zoning certificate application; the extracted text is mostly dimension labels and is hard to read.

    April 15, 2026 · 1 page · 39 KB · PDS-Maps and Drawings

    Download Site plan

Plans

  • Revised front elevation drawing with header and portal details, plus 2018 IRC braced-wall-line length calculations for side-to-side and front-to-back walls.

    May 30, 2026 · 1 page · 704 KB · PDS-Maps and Drawings

    Download Revised building elevations and braced-wall-line calculations
  • Revised floor plans for the zoning certificate application, with roof plan and braced wall details, though much of the drawing text is garbled in the extraction.

    May 30, 2026 · 1 page · 322 KB · PDS-Maps and Drawings

    Download Revised floor plans dated 5-28-26
  • Elevation drawings showing east-west and north views, including a vaulted ceiling profile.

    April 15, 2026 · 1 page · 39 KB · PDS-Maps and Drawings

    Download Building elevations
  • Interior floor plan sheet showing room layouts, including a living room, bedroom, closet and desk area, with dimension labels.

    April 15, 2026 · 1 page · 32 KB · PDS-Maps and Drawings

    Download Floor plan
  • Construction detail sheet for braced wall portal frames, showing header, anchor bolt, sheathing nailing and foundation connection details referencing IRC Table R602.10 provisions.

    April 15, 2026 · 1 page · 519 KB · PDS-Other Small Docs

    Download Braced wall calculation
  • Single-page braced wall line plan drawing, with dimensions and wall layout marks; the text is mostly illegible drawing labels.

    April 15, 2026 · 1 page · 25 KB · PDS-Other Small Docs

    Download Braced wall plan
  • One-page electrical plan sheet for the zoning certificate application; the text is mostly garbled scan noise, so details are unclear.

    April 15, 2026 · 1 page · 42 KB · PDS-Other Small Docs

    Download Electrical plan
  • Single-sheet preliminary foundation plan with anchor bolt and washer plate detail, filed with a zoning certificate application.

    April 15, 2026 · 1 page · 37 KB · PDS-Other Small Docs

    Download Preliminary foundation plan
  • Sheet of general notes listing design loads, wind and seismic criteria, and the 2018 IRC and IECC code editions that apply to the work.

    April 15, 2026 · 1 page · 202 KB · PDS-Other Small Docs

    Download General notes on structural and energy codes
  • One-page roof plan drawing showing gutter and ridge lines, with minimal legible text beyond the sheet label.

    April 15, 2026 · 1 page · 17 KB · PDS-Other Small Docs

    Download Roof plan
  • Single-page drawing of a typical exterior wall detail showing framing, sheathing, insulation, siding and sill plate connections.

    April 15, 2026 · 1 page · 40 KB · PDS-Other Small Docs

    Download Typical wall section

Project narrative

  • Homeowner's letter requesting planning approval to build a 497 sq. ft. accessory dwelling unit in the backyard, intended to supplement retirement income and offer affordable multi-generational housing.

    April 15, 2026 · 1 page · 38 KB · PDS-Letter of Intent

    Download Detailed letter of explanation for accessory dwelling unit

Decisions

Notices

  • City of Boise notice that a 495 square foot accessory dwelling unit behind an existing house was reviewed and approved under the zoning ordinance; appeals are due by June 15, 2026.

    June 3, 2026 · 2 pages · 684 KB · PDS-Legal Notice

    Download Notice of approval for zoning certificate

Application

Photos

  • Three photos of the accessory dwelling unit site, taken from east-to-west, north-to-south and south-to-north viewpoints.

    April 15, 2026 · 3 pages · 1.0 MB · PDS-Photos

    Download Site photos of the ADU location

Correspondence

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

    June 4, 2026 · 3 pages · 173 KB · PDS-Agency Comments

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

    June 4, 2026 · 1 page · 151 KB · PDS-Agency Comments

    Download Fire Department comments
  • NMID has no comment on the application since no facilities are affected and stormwater stays on site, but it requires private laterals and waste ways be protected and drainage be retained on site.

    June 4, 2026 · 2 pages · 329 KB · PDS-Agency Comments

    Download Nampa & Meridian Irrigation District comments
  • Boise Parks and Recreation finds the plans acceptable but recommends planting a new Class II or III deciduous tree to replace a mature rear-yard tree already removed for the ADU.

    June 4, 2026 · 1 page · 60 KB · PDS-Agency Comments

    Download Parks and Recreation Department comments
  • Public Works requires connection to the central sanitary sewer, notes that sewer capacity fees may apply at building permit issuance, and conditions final sewer plan approval.

    June 4, 2026 · 1 page · 65 KB · PDS-Agency Comments

    Download Public Works sewer comments
  • Veolia requires a separate service line and meter for the new ADU, and a site plan must be submitted to Veolia for review and approval.

    June 4, 2026 · 1 page · 323 KB · PDS-Agency Comments

    Download Veolia Water Idaho comments on water service

Other documents

  • Noticing radius map

    June 3, 2026 · 626 KB · PDS-Maps and Drawings

  • Transmittal to review agencies

    April 17, 2026 · 136 KB · PDS-Transmittal Agencies

  • Statement of legal interest

    April 15, 2026 · 77 KB · PDS-Statement of Legal Interest

  • Receipt

    April 7, 2026 · 135 KB · PDS-Receipts

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