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Single-family home on hillside lot approved in Boise

The city approved a single-family home on a 0.31-acre lot in the Hillside Overlay on Sept. 30. Staff classed it as a Category II hillside project because of slope and soil hazards, so geotechnical and grading reports are required.

ApprovedPLN26-00508Filed May 27, 2026Central Foothills · 4691 N Accipiter Pl+1 related filing
Site plan for Single-family home on hillside lot approved in Boise
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

Project name on file: 4691 N ACCIPITER PL

Timeline

  1. Aug. 24, 2026

    Planning Applications: Project Entitled

  2. June 9, 2026

    Pending Application Submittal: Planning Applications in Review

  3. June 8, 2026

    Concept Review Complete: CR Complete - Type 2

  4. June 2, 2026

    Concept Review Complete: Corrections Required

    Maximum driveway width in the front setback may not exceed 30' wide. Please provide a site plan that meets this requirement.

  5. May 28, 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, 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 or we can set up a meeting if you prefer.

  6. May 27, 2026

    Concept Review Complete: Engineering Preview

  7. May 27, 2026

    Application Submittal: Online

  8. May 27, 2026

    Application filed

Documents

Site plans

  • Site plan with general notes, setbacks, energy compliance notes and foundation notes for a new attached-garage home in an existing subdivision lot.

    May 27, 2026 · 7 pages · 2.9 MB · PDS-Other Small Docs

    Download Site plan for new single-family home

Plans

  • Detail sheet with grading and drainage notes, including foundation drain, roof drain, side yard conveyance, expansion joint, and cleanout details, referencing the geotechnical report.

    June 5, 2026 · 1 page · 675 KB · PDS-Other Small Docs

    Download Grading and drainage construction details
  • Site grading plan showing existing and proposed contours, drainage features, and numbered callout notes on erosion control, roof and foundation drains, and driveway and patio work.

    June 5, 2026 · 1 page · 874 KB · PDS-Other Small Docs

    Download Grading plan

Project narrative

  • Advisory concept review notes covering one single-family unit, parking and driveway limits, and a Category II hillside determination requiring a geotechnical report and structural calculations.

    June 8, 2026 · 2 pages · 470 KB · PDS-Concept Review Summary Report

    Download Concept review summary for single-family home in hillside overlay

Application

  • Application for a new single-family residence on an R-1A zoned parcel, with applicant, owner, and zoning details listed; it references a required Hillside Questionnaire.

    May 27, 2026 · 2 pages · 158 KB · PDS-Application

    Download Planning project application form
  • Public Works hillside questionnaire: marks a new dwelling, new driveway and grading over 12 inches; no retaining walls or parcel changes.

    May 27, 2026 · 1 page · 688 KB · PDS-Other Small Docs

    Download Hillside project questionnaire

Studies and reports

  • Manual S compliance report pairing a Trane split AC and gas furnace with the calculated cooling and heating loads for the whole house, dated June 8, 2026.

    June 9, 2026 · 26 pages · 913 KB · PDS-Other Small Docs

    Download Manual S equipment compliance report
  • Idaho Native Geotech's limited deep subsurface evaluation of several lots in Eyrie Canyon Subdivision No. 11, reviewing prior ALLWEST geotechnical reports and addenda.

    May 27, 2026 · 32 pages · 1.9 MB · PDS-Other Small Docs

    Download Limited deep geotechnical evaluation for Subdivision No. 11 lots

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.

    May 28, 2026 · 5 pages · 804 KB · PDS-Agency Comments

    Download Hillside retaining wall permitting guidance

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