Planning project · Planning application
Detached garage proposed on hillside lot with existing home
The plan adds a detached garage about 19 feet tall beside a single-family house on a 0.99-acre lot. Its east wall would be set into the slope with a retaining wall. The city is reviewing the application at staff level.

From the filing
The application's description as it appears in City of Boise's record. See the official record
CAT II Hillside
Project name on file: 1381 W PARKHILL DR
Timeline
Sept. 1, 2026
Planning Applications: Generate Additional Application
Added Ben Semple as Primary Contact per Jason & Ben to generate new CFH, as Ben will be handling the submittal for Jason. Changed Jason back to Primary on PLN after generating new CFH.
Sept. 1, 2026
Pending Application Submittal: Planning Applications in Review
June 2, 2026
Concept Review Complete: CR Complete - Type 2
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.
May 27, 2026
Concept Review Complete: Engineering Preview
May 22, 2026
Application Submittal: Online
May 22, 2026
Application filed
Documents
Site plans
- Download Site plan of proposed garage
Survey-style site plan showing the proposed garage, driveway, grading elevations, utilities and property lines, dated Apr. 7, 2026.
May 22, 2026 · 1 page · 3.0 MB · PDS-Other Small Docs
Renderings
- Download Renderings of the elevations
Dimensioned floor plan, roof plan and proposed column locations for a concept design, dated Apr. 7, 2026, with footing and pitch notes.
May 22, 2026 · 1 page · 60 KB · PDS-Other Small Docs
Project narrative
- Download Project description for detached accessory garage
Narrative describing a new detached hillside garage with set-in eastern wall, retaining wall, grading limits and an enlarged French drain for runoff.
May 22, 2026 · 1 page · 52 KB · PDS-Other Small Docs
Application
- Download Planning application form
Application form for a garage addition beside an existing garage in the R-1C zone, with a Hillside Questionnaire noted as attached.
May 22, 2026 · 2 pages · 158 KB · PDS-Application
- Download Hillside questionnaire
May 22, 2026 · 1 page · 46 KB · PDS-Other Small Docs
Correspondence
- Download Hillside retaining wall permitting guidance
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



