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Zoning certificate · Planning application

Attached 896-square-foot accessory dwelling unit approved with conditions

The one-story, two-bedroom unit would be built with a new single-family home. Approval requires a paved path at least 4 feet wide to its entrance, drainage kept on the property and limits on exterior construction hours. The city issued its decision July 14.

ApprovedCZC26-00113Filed May 26, 2026South Cole · 1821 S Vinnell St+3 related filings
Site plan for Attached 896-square-foot accessory dwelling unit approved with conditions
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 zoning certificate for a one-story attached accessory dwelling unit at 1821 S Vinnell Street in Boise. The 896-square-foot unit has two bedrooms and one bathroom and is proposed along with a single-family home on the lot.

ADU Permit

Project name on file: 1821 S VINNELL ST

Timeline

  1. July 25, 2026

    Appeal Period: Completed

  2. July 14, 2026

    Review Complete: Completed

  3. July 14, 2026

    Planning and Zoning: Complete

  4. June 15, 2026

    Planning and Zoning: In Review

  5. June 15, 2026

    Assign Reviewers: Completed

  6. June 12, 2026

    Fee Payment: Payment Received

  7. June 12, 2026

    Prescreen Review: Passed

  8. June 11, 2026

    Prescreen Review: In Progress

  9. May 29, 2026

    Prescreen Review: Corrections Required

  10. May 28, 2026

    Prescreen Review: In Progress

  11. May 26, 2026

    Application Submittal: ePlanReview

  12. May 26, 2026

    Application filed

Documents

Site plans

  • Site plan sheet A100 showing setbacks, foundation height notes, general notes, and square footage for a manufactured home with an accessory dwelling unit.

    June 23, 2026 · 1 page · 438 KB · PDS-Maps and Drawings

    Download Site plan for manufactured home and detached garage

Renderings

  • Three-dimensional renderings of the house plans, with electrical legend, electrical and HVAC disclaimers, and notes on outlets, GFI receptacles and vent placement.

    June 23, 2026 · 1 page · 510 KB · PDS-Maps and Drawings

    Download 3D views with electrical and HVAC notes

Plans

  • Sheet A107 of the set, labeled electrical plan, with 3D views of the residence and the designer's project details.

    June 23, 2026 · 1 page · 658 KB · PDS-Maps and Drawings

    Download Electrical plan
  • Elevation drawings for a zoning certificate, with general notes on roof venting, eaves, siding, gutters and garage and entry doors, plus left, right and rear elevation views.

    June 23, 2026 · 1 page · 323 KB · PDS-Maps and Drawings

    Download Building elevations and roof venting notes
  • Structural sheet listing foundation soil bearing, frost depth, gravity loads, general structural notes, and contractor coordination requirements, dated 6/12/2026.

    June 23, 2026 · 1 page · 1.5 MB · PDS-Maps and Drawings

    Download Engineering details: foundation design criteria and general structural notes
  • First-floor plan sheet with general notes, a braced wall calculation schedule and bracing method details, prepared for a zoning certificate.

    June 23, 2026 · 1 page · 709 KB · PDS-Maps and Drawings

    Download First floor plan, with bracing notes and calculations
  • Second-floor plan sheet for a residence, with a window schedule, interior door schedule, energy compliance notes, framing notes and square footage totals.

    June 23, 2026 · 1 page · 237 KB · PDS-Maps and Drawings

    Download Second floor plan
  • Foundation notes, anchor bolt and hold-down schedule, slab and crawl space details, and framing references for a residential garage and house, dated 6/12/2026.

    June 23, 2026 · 1 page · 568 KB · PDS-Maps and Drawings

    Download Foundation plan and details sheet
  • Construction detail drawings for adhered concrete masonry veneer, including weather-resistive barrier layers, flashing, and lath and mortar assembly.

    June 23, 2026 · 1 page · 107 KB · PDS-Maps and Drawings

    Download Masonry installation details
  • Roof and exterior construction notes for the residence, covering engineered truss requirements, eave overhangs, roof and gable vents, gutters, and a stair section with fire-rated gypsum board details.

    June 23, 2026 · 1 page · 521 KB · PDS-Maps and Drawings

    Download Roof layout and exterior notes
  • Construction section detail sheet showing framing, sheathing, insulation, anchor bolts, and slab/foundation specifications for a residential build.

    June 23, 2026 · 1 page · 2.3 MB · PDS-Maps and Drawings

    Download Wall and foundation section details
  • Framing detail sheets for braced wall panel connections, including overbuild details for perpendicular and parallel framing, prepared by the homebuilder.

    June 23, 2026 · 1 page · 1.4 MB · PDS-Maps and Drawings

    Download Shear wall and braced wall panel connection details
  • Drawing sheet D1.0 with typical construction details for a residence, including mud bench, square and arch openings, and fireplace package and mantel details.

    June 23, 2026 · 1 page · 183 KB · PDS-Other Small Docs

    Download Typical details sheet (fireplace, mud bench and openings)

Project narrative

  • Applicants describe building a new home with an attached accessory dwelling unit for a disabled family member, plus a bonus room over the garage with a side entrance for another disabled family member.

    June 23, 2026 · 1 page · 106 KB · PDS-Letter of Intent

    Download Letter of intent for new home with attached accessory dwelling unit

Decisions

Notices

  • City notice that staff found an accessory dwelling unit project consistent with the zoning ordinance and approved it, with an appeal deadline of July 24, 2026.

    July 10, 2026 · 2 pages · 668 KB · PDS-Legal Notice

    Download Administrative notice of approval for zoning certificate

Application

  • Application for an 896 sq ft accessory dwelling unit with two bedrooms on a residential R-1B lot, with a 3,035 sq ft existing home and a two-lot subdivision noted.

    May 26, 2026 · 3 pages · 208 KB · PDS-Application

    Download Zoning certificate application for accessory dwelling unit

Studies and reports

  • Engineer's composite lumber (LVL) member analysis and design per NDS-2015, covering bending, shear, and support reactions for the residence's header.

    June 23, 2026 · 81 pages · 4.3 MB · PDS-Other Small Docs

    Download Structural calculation packet for header and beam
  • HVAC load and equipment sizing report for the Smith residence showing Rheem cooling and gas furnace capacities against design loads under ACCA Manual S.

    June 23, 2026 · 49 pages · 1.7 MB · PDS-Other Small Docs

    Download Manual S compliance report, rest of house and ADU furnace

Photos

Correspondence

  • Fire Department recommends approval subject to a heat detector interconnected with ADU smoke alarms in the garage below, plus hydrant, access and street identification requirements.

    July 6, 2026 · 1 page · 194 KB · PDS-Agency Comments

    Download Fire Department agency comments
  • ACHD reports no required street improvements and lists traffic impact fee, driveway approach permit, right-of-way permit, and standard conditions of approval.

    June 30, 2026 · 3 pages · 167 KB · PDS-Agency Comments

    Download Ada County Highway District comments
  • Boise Parks and Recreation comments noting an unmapped mature tree on the site and recommending new Class II and III trees in a landscape plan.

    June 30, 2026 · 1 page · 60 KB · PDS-Agency Comments

    Download Parks and Recreation Department agency comments
  • Public Works memo stating the property must connect to central sanitary sewer, that sewer capacity fees may apply at building permit issuance, and that final sewer plan approval is pending.

    June 30, 2026 · 1 page · 66 KB · PDS-Agency Comments

    Download Sewer agency comments
  • Veolia Water Idaho reports available water pressure and flow at a nearby hydrant for fire sprinkler design, noting the Fire Department will determine adequacy.

    June 23, 2026 · 1 page · 112 KB · PDS-Other Small Docs

    Download Veolia Water fire flow information

Other documents

  • Noticing radius map

    July 10, 2026 · 552 KB · PDS-Maps and Drawings

  • Statement of legal interest

    June 23, 2026 · 190 KB · PDS-Statement of Legal Interest

  • Transmittal to agencies for review

    June 23, 2026 · 131 KB · PDS-Transmittal Agencies

  • Receipt

    June 12, 2026 · 134 KB · PDS-Receipts

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