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Zoning certificate · Planning application

Approved: two single-family homes, each with a garage apartment, replace one house

Cook Bros Construction will demolish the existing home and build two two-story single-family homes, each with a detached garage and a one-bedroom accessory unit above. The city approved the project Jan. 23 with conditions on construction hours and outdoor lighting.

ApprovedCZC25-00250Filed Dec. 5, 2025West End · 911 N 31st St+2 related filings
Site plan for Approved: two single-family homes, each with a garage apartment, replace one house
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

Cook Bros Construction proposes two single-family homes at 911 N 31st Street in Boise, each on a small residential lot in an urban residential (R-3) zone. Each home would have a detached, alley-accessed garage with a one-bedroom accessory dwelling unit above it, and the peaks would reach about 27 feet. The city approved the project on January 23, 2026, with conditions.

ADUs *Building Permits were issued with no ADU or Living Space Above Garages. In order to include in the future, need to show compliance with residential floor area requirement*

Project name on file: 911 N 31ST ST

Timeline

  1. Feb. 3, 2026

    Appeal Period: Completed

  2. Jan. 23, 2026

    Review Complete: Completed

  3. Jan. 23, 2026

    DR: Complete

  4. Dec. 31, 2025

    DR: In Review

  5. Dec. 31, 2025

    Assign Reviewers: Completed

  6. Dec. 24, 2025

    Fee Payment: Payment Received

    Updated Via Script, status API:WTUA

  7. Dec. 17, 2025

    Prescreen Review: Passed

  8. Dec. 16, 2025

    Fee Payment: Payment Received

    Payment Received and wf was being caught up

  9. Dec. 12, 2025

    Prescreen Review: In Progress

  10. Dec. 12, 2025

    Prescreen Review: Corrections Required

  11. Dec. 11, 2025

    Prescreen Review: In Progress

  12. Dec. 5, 2025

    Application Submittal: ePlanReview

  13. Dec. 5, 2025

    Application filed

Documents

Site plans

  • Sheet P-1 showing the proposed site layout with landscape notes, including irrigated lawn, boxwood, hydrangea, maple tree, vinyl fence and crushed rock.

    Dec. 31, 2025 · 1 page · 507 KB · PDS-Maps and Drawings

    Download Proposed site and landscape plan

Plans

  • Exterior elevation drawings with a revision table, showing a highest ridge height of 26.1 feet above the first-floor subfloor, at 1/4-inch scale.

    Dec. 31, 2025 · 1 page · 3.4 MB · PDS-Maps and Drawings

    Download Exterior elevations (front, rear, left, right)
  • Revised floor plan drawings at 1/4 in = 1 ft scale showing room layouts, window and door schedules, and square footage for a living area of about 1,922 sq ft.

    Dec. 31, 2025 · 1 page · 262 KB · PDS-Maps and Drawings

    Download Floor plan, first and second floors
  • Floor plan sheets for a garage and accessory dwelling unit, showing first and second floor layouts with room areas, revision table, and a Dec. 11, 2025 drawing date.

    Dec. 31, 2025 · 1 page · 2.4 MB · PDS-Maps and Drawings

    Download Garage and ADU floor plans

Project narrative

  • Applicant letter describing plans to demolish the existing home and structures, restore two original lots, and build a two-story single-family home with garage and ADU on each.

    Dec. 31, 2025 · 1 page · 68 KB · PDS-Letter of Intent

    Download Letter of intent for demolition and two new homes

Decisions

  • Planning department letter approving two single-family dwellings with detached garages and accessory dwelling units on residential small lots, subject to conditions and a 10-day appeal period.

    Jan. 23, 2026 · 12 pages · 299 KB · PDS-Action Letter

    Download Approval letter for design review and zoning certificate

Application

Photos

Correspondence

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

    Jan. 23, 2026 · 3 pages · 223 KB · PDS-Agency Comments

    Download Ada County Highway District comments
  • Fire Department approves the proposed two single-family dwellings with detached garages and ADUs, requiring a heat detector interconnected with smoke detectors in the garage.

    Jan. 23, 2026 · 1 page · 166 KB · PDS-Agency Comments

    Download Boise Fire Department comments
  • Parks staff say the site plan omits a mature rear-yard tree and ask for more information, since no new trees are planned with the development.

    Jan. 23, 2026 · 1 page · 58 KB · PDS-Agency Comments

    Download Boise Parks and Recreation comments
  • Public Works requires connection to the central sanitary sewer, separate service lines per single-family home, a sewer tap permit for new connections, and possible sewer capacity fees at building permit.

    Jan. 23, 2026 · 1 page · 43 KB · PDS-Agency Comments

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

    Jan. 23, 2026 · 1 page · 125 KB · PDS-Agency Comments

    Download Public Works street light comments
  • Water utility comments requiring a will-serve letter, civil or site plan review, separate service lines and meters per building, and compliance with Veolia standards.

    Jan. 23, 2026 · 1 page · 307 KB · PDS-Agency Comments

    Download Veolia Water Idaho 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.

    Dec. 31, 2025 · 1 page · 131 KB · PDS-Other Small Docs

    Download Veolia water pressure and flow letter for fire flow review

Other documents

  • Transmittal sheet

    Jan. 2, 2026 · 101 KB · PDS-Transmittal Agencies

  • Statement of legal interest

    Dec. 31, 2025 · 393 KB · PDS-Statement of Legal Interest

  • Receipt

    Dec. 16, 2025 · 136 KB · PDS-Receipts

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