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Zoning certificate · Planning application

Boise approves 651-square-foot backyard accessory dwelling unit

The approved single-story detached unit has two bedrooms and one bathroom, built in the back yard of an existing house. Approval came with conditions on sound insulation, a paved path to the entrance, and exterior lighting limits.

ApprovedCZC25-00201Filed Oct. 1, 2025Borah · 6455 W Grandview Dr+1 related filing
Site plan for Boise approves 651-square-foot backyard accessory dwelling unit
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

A property owner at 6455 W Grandview Drive in Boise has been approved to build a single-story detached accessory dwelling unit (a small second home) in the back yard of the existing house. The unit is 651 square feet with two bedrooms and one bathroom.

Accessory Dwelling Unit (ADU)

Project name on file: 6455 W GRANDVIEW DR - ADU

Timeline

  1. Nov. 25, 2025

    Appeal Period: Completed

  2. Nov. 14, 2025

    Review Complete: Completed

  3. Nov. 14, 2025

    Current Planning: Complete

  4. Oct. 28, 2025

    Current Planning: In Review

  5. Oct. 28, 2025

    Assign Reviewers: Completed

  6. Oct. 20, 2025

    Fee Payment: Payment Received

  7. Oct. 20, 2025

    Prescreen Review: Passed

  8. Oct. 17, 2025

    Prescreen Review: In Progress

  9. Oct. 9, 2025

    Prescreen Review: Corrections Required

  10. Oct. 8, 2025

    Prescreen Review: In Progress

  11. Oct. 1, 2025

    Application Submittal: ePlanReview

  12. Oct. 1, 2025

    Application filed

Documents

Site plans

  • Site plan sheet showing property lines, setbacks, drainage and slope notes, along with prescriptive energy code notes, adopted codes, and climate design criteria.

    Oct. 29, 2025 · 2 pages · 1.4 MB · PDS-Maps and Drawings

    Download Site plan with energy notes and design criteria

Plans

  • Elevation drawing labeled with front and rear endwall and sidewall dimensions, including 50-foot endwalls, 48-foot sidewalls, and 14'-8" and 13'-4" heights.

    Oct. 29, 2025 · 1 page · 39 KB · PDS-Maps and Drawings

    Download Building elevations
  • Floor plan drawings submitted with the zoning certificate application, showing room dimensions across two pages.

    Oct. 29, 2025 · 2 pages · 67 KB · PDS-Maps and Drawings

    Download Floor plans

Project narrative

  • Contractor's letter describing a prebuilt manufactured accessory dwelling unit with a poured foundation, located in an R1-C zone.

    Oct. 29, 2025 · 1 page · 45 KB · PDS-Letter of Intent

    Download Letter of intent for rear ADU

Decisions

Notices

  • City planning staff notice that a detached accessory dwelling unit was approved under the zoning ordinance, with appeals due by November 24, 2025.

    Nov. 12, 2025 · 2 pages · 729 KB · PDS-Legal Notice

    Download Notice of approval for detached ADU

Application

Photos

  • Photographs of the site submitted with the zoning certificate application; the text is mostly unreadable image noise.

    Oct. 29, 2025 · 4 pages · 22.5 MB · PDS-Photos

    Download Site photos

Correspondence

  • The Boise Fire Department reports no comments on the zoning certificate review, noting that IBC, IFC and city code requirements will apply at building permit stage.

    Nov. 14, 2025 · 1 page · 152 KB · PDS-Agency Comments

    Download Boise Fire Department comments
  • Boise Parks and Recreation, reviewed with Community Forestry, has no comment on the application.

    Nov. 14, 2025 · 1 page · 58 KB · PDS-Agency Comments

    Download Parks and Recreation comments
  • Nov. 14, 2025 · 1 page · 40 KB · PDS-Agency Comments

    Download Public Works sewer comments
  • Public Works street light supervisor reports no comments on the zoning certificate application.

    Nov. 14, 2025 · 1 page · 125 KB · PDS-Agency Comments

    Download Street light department comments
  • Veolia requires a separate service line and meter for the new ADU structure and asks for a site plan submittal for review before approval.

    Nov. 14, 2025 · 1 page · 300 KB · PDS-Agency Comments

    Download Veolia Water Idaho comments on water service
  • Nov. 13, 2025 · 1 page · 196 KB · PDS-Agency Comments

    Download PDS-Agency Comments - WEST BOISE SEWER DISTRICT COMMENT - 11/7/25
  • 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.

    Nov. 7, 2025 · 3 pages · 181 KB · PDS-Agency Comments

    Download Ada County Highway District comments
  • Boise Project Board of Control states no Boise Project or New York Irrigation District facilities or surface water right exist on the property, but neighboring ditches must stay unobstructed and protected by easement.

    Nov. 7, 2025 · 2 pages · 165 KB · PDS-Agency Comments

    Download Irrigation district comment on zoning certificate
  • Veolia Water Idaho reports water pressure and flow available at a hydrant near the property, for fire sprinkler design under maximum-day conditions.

    Oct. 29, 2025 · 1 page · 131 KB · PDS-Other Small Docs

    Download Veolia Water fire flow availability letter

Other documents

  • Noticing radius map

    Nov. 12, 2025 · 563 KB · PDS-Maps and Drawings

  • Transmittal to agencies

    Oct. 31, 2025 · 99 KB · PDS-Transmittal Agencies

  • Statement of legal interest

    Oct. 29, 2025 · 1.6 MB · PDS-Statement of Legal Interest

  • Receipt

    Oct. 20, 2025 · 135 KB · PDS-Receipts

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