Planning project · Planning application
Backyard swimming pool and spa proposed on hillside lot at existing home
The plan is a 15-by-30-foot pool with an 8-by-8-foot spa, with its infinity edge built at the hillside's edge. City planners say it needs a Category 2 hillside permit, likely with a geotechnical report. The city's administrative staff will review it.

About this application
Swimming pool in Hillside
Project name on file: 220 W SKY DR
Timeline
Two days ago
4 documents added
July 21, 2026
Concept Review Complete: CR Complete - Type 2
July 17, 2026
Concept Review Complete: Engineering Preview
July 17, 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.
July 16, 2026
Application Submittal: Online
July 16, 2026
Application filed
Documents
Site plans
- Download Simple site plan of backyard, house and pool
One-page site plan showing a 15'x30' pool, an 8'x8' spa, and a 7' setback from the pool's southwest corner to the foundation, with a proposed infinity edge on the hillside.
July 16, 2026 · 1 page · 81 KB · PDS-Other Small Docs
Project narrative
- Download Concept review summary
Advisory concept review for a backyard pool and spa on a hillside lot, with planner notes that the project is a Category II hillside development requiring a geotechnical report and related documents.
July 21, 2026 · 2 pages · 457 KB · PDS-Concept Review Summary Report
Application
- Download Planning project application for backyard swimming pool and spa
Application to build a 15x30 foot swimming pool with an 8x8 foot spa and an infinity edge in a residential R-1B zone, with a Hillside Questionnaire required.
July 16, 2026 · 2 pages · 155 KB · PDS-Application
- Download PDS-Other Small Docs - HILLSIDE QUESTIONAIRE
July 16, 2026 · 1 page · 691 KB · PDS-Other Small Docs