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Planning project · Planning application

New single-family home proposed on hillside lot, with extra slope review required

The plan calls for one single-family home with an attached garage on a 0.24-acre lot. The city says it needs the stricter hillside review because of steep slopes and unstable soils, and the application is under administrative review.

In reviewPLN26-00352Filed April 15, 2026Warm Springs Mesa · 3615 E Asteroid Ct+1 related filing
Site plan for New single-family home proposed on hillside lot, with extra slope review required
Site plan from the application documents.
Pin at the reported location; the shaded outline is the primary parcel (Ada County).

From the filing

City of Boise hasn't published a description of this application yet. See the official record

Project name on file: 3615 E ASTEROID CT

Timeline

  1. June 29, 2026

    Pending Application Submittal: Planning Applications in Review

  2. April 16, 2026

    Concept Review Complete: CR Complete - Type 2

  3. April 15, 2026

    Concept Review Complete: Engineering Preview

  4. April 15, 2026

    Concept Review Complete: Engineering Preview Complete

    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, 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.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 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 or we can set up a meeting if you prefer.

  5. April 15, 2026

    Application Submittal: Online

  6. April 15, 2026

    Application filed

Documents

Site plans

  • Site plan sheet with general construction notes, a building area breakdown totaling 3,580 square feet, and designer contact information from Biltmore Company.

    April 15, 2026 · 1 page · 758 KB · PDS-Other Small Docs

    Download Site plan with general notes and building area totals

Project narrative

  • Advisory concept review notes for one single-family home, covering access, parking, zoning history, height and retaining wall limits, and Category II Hillside requirements.

    April 16, 2026 · 3 pages · 467 KB · PDS-Concept Review Summary Report

    Download Concept review summary for single-family home

Application

  • Application for a single-family dwelling on an A-1 zoned lot, noting a Hillside Questionnaire is required and certifying the applicant's authority to file.

    April 15, 2026 · 2 pages · 158 KB · PDS-Application

    Download Planning project application form
  • Public Works questionnaire marking a new dwelling and a new access road or driveway as part of the project, with grading and retaining wall questions left largely unresolved.

    April 15, 2026 · 1 page · 677 KB · PDS-Other Small Docs

    Download Public Works hillside project questionnaire

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.

    April 15, 2026 · 5 pages · 804 KB · PDS-Agency Comments

    Download Hillside retaining wall permitting guidance

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