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Planning project · Planning application

Single-family home proposed on 0.2-acre hillside lot

The application is under administrative review by city planners. Because of steep slopes and unstable soils, the home needs a Category II Hillside review, which calls for a geotechnical report and retaining wall details.

In reviewPLN26-00297Filed March 26, 2026Warm Springs Mesa · 3572 E Asteroid Dr+1 related filing
Site plan for Single-family home proposed on 0.2-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

Single-family home in Hillside Overlay

Project name on file: 3572 E ASTEROID DR

Timeline

  1. April 9, 2026

    Pending Application Submittal: Planning Applications in Review

  2. April 3, 2026

    Concept Review Complete: CR Complete - Type 2

  3. April 2, 2026

    Concept Review Complete: Engineering Preview

  4. April 2, 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 that is greater than four feet of height, more than one retaining wall when the horizontal interior distance between the retaining walls is less than 10 feet and the total of all retaining walls exceeds four feet in height, a retaining wall having a surcharge, having 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. March 26, 2026

    Application Submittal: Online

  6. March 26, 2026

    Application filed

Documents

Site plans

  • Site plan for a proposed lot showing setbacks, driveway and patio layout, with numbered comments on driveway slope, final grading, drainage, retaining walls over 4 feet needing engineering, and berming.

    March 26, 2026 · 1 page · 692 KB · PDS-Other Small Docs

    Download Proposed site plan with drainage and grading comments

Project narrative

  • Planning concept review summary for a single-family home in the Hillside Overlay, classed as Category II Hillside, listing required geotechnical, structural and civil documents.

    April 3, 2026 · 2 pages · 470 KB · PDS-Concept Review Summary Report

    Download Concept review summary
  • Public Works questionnaire answering whether the project involves a new dwelling, new grading over 12 inches, and retaining walls, with a few checkboxes marked no or unknown.

    March 26, 2026 · 1 page · 672 KB · PDS-Other Small Docs

    Download Hillside project questionnaire

Application

  • Application for a single-family residence in the A-1 zone, with a Hillside Questionnaire required, filed by Core Building Co.

    March 26, 2026 · 2 pages · 158 KB · PDS-Application

    Download Planning project application form

Studies and reports

  • Soils test pit findings for the lot, including bedrock depth, expansive fat clay, and recommended foundation types and bearing pressure of 1500 psf.

    March 26, 2026 · 16 pages · 1.2 MB · PDS-Other Small Docs

    Download Geotechnical recommendation report

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 2, 2026 · 5 pages · 804 KB · PDS-Agency Comments

    Download Hillside retaining wall permitting guidance

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