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Foothills/hillside · Planning application

Hillside permit approved for new gunite pool and spa on sloped lot

The city approved a hillside development permit to replace an existing vinyl pool with a 20-by-40-foot gunite pool and add a 7-by-7-foot spa, plus retaining walls and grading. The approval was issued March 17 and takes effect only after the appeal period ends.

ApprovedCFH25-00085Filed Feb. 10, 2026East End · 106 N Castello Pl+1 related filing
Site plan for Hillside permit approved for new gunite pool and spa on sloped 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

The city approved a hillside development permit at 106 N Castello Pl in Boise to remove an existing vinyl pool and build a new gunite swimming pool in the rear yard, along with retaining walls and grading on the sloped lot. The approval was issued March 17, 2026, and it takes effect only after the appeal period ends.

CAT II Hillside

Project name on file: 106 N CASTELLO PL

Timeline

  1. March 28, 2026

    Appeal Period: Completed

  2. March 17, 2026

    Review Complete: Completed

  3. March 17, 2026

    Current Planning: Complete

  4. March 3, 2026

    Current Planning: In Review

  5. March 3, 2026

    Assign Reviewers: Completed

  6. Feb. 26, 2026

    Review Complete: Corrections Required

  7. Feb. 26, 2026

    Current Planning: Corrections Required

  8. Feb. 18, 2026

    Current Planning: In Review

  9. Feb. 18, 2026

    Assign Reviewers: Completed

  10. Feb. 17, 2026

    Fee Payment: Payment Received

  11. Feb. 17, 2026

    Prescreen Review: Passed

  12. Feb. 17, 2026

    Prescreen Review: In Progress

  13. Feb. 17, 2026

    Prescreen Review: Corrections Required

  14. Feb. 13, 2026

    Prescreen Review: In Progress

  15. Feb. 12, 2026

    Prescreen Review: Corrections Required

  16. Feb. 10, 2026

    Prescreen Review: In Progress

  17. Feb. 10, 2026

    Application Submittal: ePlanReview

  18. Feb. 10, 2026

    Application filed

Documents

Site plans

  • Plot plan sheet for the application; the extracted text is only a Google Earth link and contains no readable plan details.

    Feb. 24, 2026 · 1 page · 741 KB · PDS-Maps and Drawings

    Download Plot plan
  • Feb. 24, 2026 · 1 page · 325 KB · PDS-Maps and Drawings

    Download Site plan

Plans

  • Engineering sheet with general notes stating that the pool, spa, sanitary sewer washout and hardscape are approximate, with exploration map locations marked for reference only.

    March 17, 2026 · 1 page · 180 KB · PDS-Maps and Drawings

    Download Sewer washout plan, revision R1
  • Cover sheet for the swimming pool plan set, listing the drawing index, design criteria, seismic and soil parameters, and general construction notes.

    Feb. 24, 2026 · 1 page · 1.3 MB · PDS-Maps and Drawings

    Download Swimming pool cover sheet and general notes
  • Structural engineering plan notes and pool shell section for the swimming pool, covering penetrations, drains, handrail bonding, hydrostatic relief, and soil requirements.

    Feb. 24, 2026 · 1 page · 296 KB · PDS-Maps and Drawings

    Download Pool plan and section, structural notes
  • Engineering sheet with swimming pool and spa wall reinforcement elevations, bond beam and reinforcement schedules, skimmer and step details, dated Feb. 17, 2026.

    Feb. 24, 2026 · 1 page · 626 KB · PDS-Maps and Drawings

    Download Pool wall reinforcement and details
  • Structural drawing of a spa plan and section with plan notes on shotcrete strength, plumbing penetrations and reinforcement, dated January 16, 2026.

    Feb. 24, 2026 · 1 page · 165 KB · PDS-Maps and Drawings

    Download Spa plan and section, sheet SP1.10
  • Structural sheet with wall reinforcement elevations, bond beam schedule, depth and radius schedule, and notes for the swimming pool and spa walls, dated Feb. 17, 2026.

    Feb. 24, 2026 · 1 page · 225 KB · PDS-Maps and Drawings

    Download Swimming pool and spa wall reinforcement details

Project narrative

  • Letter from the pool contractor describing replacing a vinyl liner pool with a 20 by 40 foot gunite pool in the same footprint, plus a 7 by 7 foot spa, with minimal excavation.

    March 17, 2026 · 1 page · 75 KB · PDS-Letter of Intent

    Download Letter of intent for pool replacement and spa addition

Decisions

  • Planning and Development Services approval of a Category II hillside permit for a pool replacement and retaining walls, relying on a geotechnical report and Public Works staff opinion that the site is suitable.

    March 17, 2026 · 6 pages · 211 KB · PDS-Action Letter

    Download Administrative approval letter for hillside development permit

Notices

  • Planning and Development Services notice that a hillside permit to remove and replace a swimming pool was approved after staff review, with an appeal deadline of March 27, 2026.

    March 13, 2026 · 2 pages · 1.1 MB · PDS-Legal Notice

    Download Notice of administrative approval

Application

  • Application form for a Category II single-lot single-family pool project in a hillside area, with applicant, owner, and property details.

    Feb. 24, 2026 · 2 pages · 204 KB · PDS-Application

    Download Hillside and foothills development application form
  • Application for a Category II single-lot, single-family residential project on a hillside property in the foothills, filed by a pool company on behalf of the owner.

    Feb. 10, 2026 · 2 pages · 203 KB · PDS-Application

    Download Hillside and foothills development application

Studies and reports

  • ABCO Engineering letter concluding a nearby slope under 33.3% grade meets IBC setback requirements, so a slope stability analysis is not required for the proposed pool and spa.

    March 17, 2026 · 2 pages · 32 KB · PDS-Other Small Docs

    Download Slope stability exemption letter from geotechnical engineer
  • Geotechnical investigation for a residential pool and spa, covering site geology, subsurface profile, groundwater, ground motion and corrosion potential, with recommendations.

    Feb. 24, 2026 · 62 pages · 7.5 MB · PDS-Maps and Drawings

    Download Geotechnical investigation report

Correspondence

  • Fire Department approves the in-ground pool as presented, with wildland-urban interface defensible space, setback and open-flame restrictions.

    March 17, 2026 · 2 pages · 278 KB · PDS-Agency Comments

    Download Boise Fire Department comments
  • Public Works staff find the pool project suitable for the site, citing a geotechnical report, while warning that pools above slopes carry slope-creep risk.

    March 17, 2026 · 2 pages · 135 KB · PDS-Agency Comments

    Download Public Works drainage and hillside comments
  • Public Works memo on sanitary sewer connection for a pool, noting a 50 gpm discharge limit and possible sewer capacity fees at building permit issuance.

    March 17, 2026 · 1 page · 77 KB · PDS-Agency Comments

    Download Public Works sewer comments

Other documents

  • Noticing radius map

    Map showing the area within the notice radius for neighboring property owners who were sent notice of the application.

    March 13, 2026 · 533 KB · PDS-Maps and Drawings

  • Statement of legal interest

    Feb. 24, 2026 · 231 KB · PDS-Statement of Legal Interest

  • Submittal checklist

    Feb. 24, 2026 · 945 KB · PDS-Submittal Checklist

  • Transmittal to review agencies

    Feb. 24, 2026 · 135 KB · PDS-Transmittal Agencies

  • Fee receipt

    Feb. 17, 2026 · 134 KB · PDS-Receipts

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