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Planning project · Planning application

Detached garage and studio in front of existing home sought on 5-acre hillside lot

The owner wants a conditional use permit to build a detached garage and studio in front of the existing house. Plans say it will not be a dwelling. The project is in neighborhood meeting review and also needs a hillside permit.

In reviewPLN26-00806Filed Aug. 27, 2026East End · 2478 E Warm Springs Ave+2 related filings
Site plan for Detached garage and studio in front of existing home sought on 5-acre hillside lot
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

CUP for detached accessory in front of the primary structure in Hillside

Project name on file: 2478 E WARM SPRINGS AVE

Timeline

  1. Oct. 15, 2026

    Document added: PDS-Other Small Docs - NEIGHBORHOOD MEETING INVITE LETTER.

  2. Oct. 15, 2026

    Document added: PDS-Other Small Docs - NEIGHBORHOOD MEETING SIGN UP SHEET.

  3. Oct. 13, 2026

    12 documents added

  4. Oct. 13, 2026

    Status changed from Submitted to In review

    Reported as “Neighborhood Meeting Review”.

  5. Sept. 21, 2026

    Concept Review Complete: CR Complete - Type 3

  6. Sept. 16, 2026

    Concept Review Complete: Engineering Preview Complete

    Based on submitted documents and limited overview of the property, a determination has been made that this project will be a Category II Hillside project due to slope, erosion-prone soils, unstable soils, earth movement, and other geologic and hydrologic hazards. In addition to the already submitted documents (please submit them with subsequent applications), additional documents may be required during the CFH Review process.Additional documents that you can expect to provide will be a site-specific geotechnical report with the possibility of a global slope stability analysis (please see the Agency Comment for Hillside Retaining Wall Permitting within this PLN); structural calculations for any retaining wall system that is greater than four feet in height from top of foundation to top of wall, that has more than one wall when the interior horizontal distance between the walls is less than 10 feet and the total height of all walls exceeds four feet, that has a surcharge, that has a backslope greater than three feet horizontal to one foot vertical, or that has structural components (these requirements will be assessed again at the time of occupancy); and civil plans. Please refer to the Hillside Development Requirements for Technical Reports for grading & drainage plan and geotechnical report requirements.A subgrade inspection by a geotechnical firm will be required at the time of construction once the subgrade is exposed and prior to placement of foundation materials or forms/rebar. A report of the inspection will need to be submitted to and accepted by PW Hillside (HillsideDrainage@cityofboise.org) before scheduling your inspection with the Building Department and receiving final occupancy.NOTE: The hazards of developing and building on a property, especially in the Boise foothills, are well known. It is the responsibility of the applicant/owner’s design, geological, and engineering professionals, not the City, to identify, address, and mitigate any hazards to the site. Satisfying these Conditions of Approval is for limited [City purpose] only and should not be relied on for design, geological or engineering purposes. Developer will comply with all requirements of Boise City Hillside Development Code Sections or submit evidence satisfactory to the Boise City Engineer that the proposed development is exempt from the requirements therein stated due to location, topography and/or the absence of adverse conditions associated with slope stability, ground water, erosion and sedimentation.If you would like to discuss this determination, please contact us at HillsideDrainage@cityofboise.org. Please include your application number and address in the subject line.

  7. Sept. 15, 2026

    Concept Review Complete: Engineering Preview

  8. Aug. 28, 2026

    Concept Review Complete: Corrections Required

    Please upload a site plan showing the proposed garage, a floor plan and the hillside questionnaire.

  9. Aug. 27, 2026

    Application Submittal: Online

  10. Aug. 27, 2026

    Application filed

Documents

Site plans

  • Architect's site plan sheet A100 showing a proposed detached structure, with general notes, symbol legend and tree protection notes; marked concept design V2.

    Sept. 10, 2026 · 1 page · 136 KB · PDS-Other Small Docs

    Download Updated site plan, concept design V2
  • Survey drawing of a parcel line adjustment showing existing boundaries, curve data, fencing, and the existing house and garage, with original and adjusted parcel acreages.

    Aug. 27, 2026 · 1 page · 390 KB · PDS-Other Small Docs

    Download Basic site plan for parcel line adjustment, existing conditions

Plans

  • Architectural floor plan sheet A201 for a concept design (V4) showing the office, studio, bath and storage layouts across two levels.

    Sept. 17, 2026 · 1 page · 1.4 MB · PDS-Other Small Docs

    Download Updated floor plans, Level 01 and Level 02
  • Concept design V3 floor plans for a small studio apartment project, showing a 440 SF studio unit, storage, a WC, and a utility sink, marked not for construction.

    Sept. 15, 2026 · 1 page · 1.4 MB · PDS-Other Small Docs

    Download Updated conceptual floor plans, levels 01 and 02
  • Concept design set of north, south, east and west building elevations, marked not for construction and dated for the Concept Design V2 phase.

    Sept. 10, 2026 · 1 page · 403 KB · PDS-Other Small Docs

    Download Conceptual exterior elevations, sheet A201
  • Architect's conceptual design floor plan sheet A201 for the second level, marked as not for construction, showing a 515 SF studio apartment and 1,370 SF upper level.

    Sept. 10, 2026 · 1 page · 1.2 MB · PDS-Other Small Docs

    Download Conceptual floor plans, level 02

Project narrative

  • Planner's concept review summary for a detached garage/studio project requiring a Conditional Use Permit and Category II Hillside Permit, with notes on expected geotechnical and retaining wall documentation.

    Sept. 21, 2026 · 3 pages · 462 KB · PDS-Concept Review Summary Report

    Download Concept review summary report
  • Describes replacing a failing detached storage structure with a workshop and office building in the hillside/WUI zone, and states the project meets zoning and hillside requirements.

    Sept. 17, 2026 · 1 page · 51 KB · PDS-Other Small Docs

    Download Updated project description for conditional use and hillside applications
  • Describes replacing a failing detached storage structure with a detached art studio and studio ADU in the hillside zone, and states the project meets the zoning code.

    Sept. 15, 2026 · 1 page · 51 KB · PDS-Other Small Docs

    Download Conditional use and hillside project description

Notices

  • Invitation to a required pre-application neighborhood meeting on Oct. 8 at 6:00pm, proposing a new accessory storage structure with a Conditional Use Permit.

    Oct. 15, 2026 · 3 pages · 1.6 MB · PDS-Other Small Docs

    Download Neighborhood meeting invitation letter
  • Sign-up sheet for attendees of a neighborhood meeting on the planning application; the text is mostly garbled or reversed and names are not legible in the extract.

    Oct. 15, 2026 · 1 page · 173 KB · PDS-Other Small Docs

    Download Neighborhood meeting sign-up sheet

Application

  • Questionnaire answers on hillside development triggers, indicating a parcel boundary or grading change and a retaining wall with no wall over 4 feet exposed and no stacked walls.

    Sept. 10, 2026 · 1 page · 688 KB · PDS-Other Small Docs

    Download Public Works hillside project questionnaire
  • Application form for a proposed replacement of a failing detached garage and studio on an A-1 zoned parcel, with the existing use remaining, and a hillside questionnaire reference.

    Aug. 27, 2026 · 2 pages · 155 KB · PDS-Application

    Download Planning project application form

Correspondence

  • Public Works guidance on when retaining walls in the hillside zone need a determination, slope stability analysis, and planning-code height and setback limits.

    Sept. 16, 2026 · 5 pages · 804 KB · PDS-Agency Comments

    Download Hillside retaining wall permitting guidance

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