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Zoning certificate · Planning application

Two-story, two-bedroom backyard cottage approved with conditions to replace garage

The 775-square-foot detached accessory dwelling unit would replace a detached garage and stand about 23 feet tall. Approval requires an alley-loaded parking space, a five-foot landscape buffer and on-site drainage. A Sept. 4 letter records the decision.

ApprovedCZC26-00126Filed May 6, 2026Southeast Boise · 1404 S Longmont Ave+1 related filing
Site plan for Two-story, two-bedroom backyard cottage approved with conditions to replace garage
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 applicant wants to tear down a detached garage and build a two-story, 775-square-foot detached accessory dwelling unit (ADU) at the rear of the existing home at 1404 S Longmont Ave, next to the alley. The ADU would have two bedrooms and one bathroom and stand about 23 feet tall, with an open-air parking space reached from the alley.

Detached ADU

Project name on file: 1404 S LONGMONT AVE - ADU

Timeline

  1. Sept. 15, 2026

    Appeal Period: Completed

  2. Sept. 4, 2026

    Review Complete: Completed

  3. Sept. 4, 2026

    Planning and Zoning: Complete

  4. Aug. 20, 2026

    Planning and Zoning: In Review

  5. Aug. 20, 2026

    Assign Reviewers: Completed

  6. Aug. 18, 2026

    Review Complete: Corrections Required

  7. Aug. 18, 2026

    Planning and Zoning: Corrections Required

  8. Aug. 3, 2026

    Planning and Zoning: In Review

  9. Aug. 3, 2026

    Assign Reviewers: Completed

  10. July 28, 2026

    Fee Payment: Payment Received

  11. July 28, 2026

    Prescreen Review: Passed

  12. July 27, 2026

    Prescreen Review: In Progress

  13. July 10, 2026

    Prescreen Review: Notes

    Application was Submitted with missing information. Caught up on Call with Building Contractor.

  14. July 10, 2026

    Application Submittal: ePlanReview

  15. May 6, 2026

    Application filed

Documents

Site plans

  • Plot plan for a zoning certificate showing setback dimensions, a proposed ADU, an off-street parking area, a protected existing tree, and a tankless water heater.

    Aug. 4, 2026 · 1 page · 300 KB · PDS-Maps and Drawings

    Download Site plan with setbacks, ADU and tree protection

Plans

  • Revised floor plan sheet dated 8/18/26, with room dimensions, door and window labels, and living area totals drawn by a manufactured home maker.

    Sept. 4, 2026 · 1 page · 173 KB · PDS-Maps and Drawings

    Download Revised floor plan
  • Elevation drawings for the house showing ridge and wall heights, window and door schedule, and exterior finish colors, prepared by Mode Homes.

    Aug. 4, 2026 · 2 pages · 5.6 MB · PDS-Maps and Drawings

    Download Building elevations, front, rear and side views
  • Dimensioned floor plan showing first and second floor layouts, room sizes, ceiling heights, and mechanical heater and unit locations, drawn at 3/8 in = 1 ft scale.

    Aug. 4, 2026 · 1 page · 211 KB · PDS-Maps and Drawings

    Download Floor plan, dimensioned (sheet 3)

Project narrative

  • Mode Homes describes a proposed 765 sq ft two-story ADU in the backyard with 2 bedrooms, meeting R2 setbacks and the size limit relative to the primary house.

    Aug. 4, 2026 · 1 page · 74 KB · PDS-Letter of Intent

    Download Letter of intent for accessory dwelling unit

Decisions

Notices

  • Notice that an administrative approval was granted to construct a two-story detached accessory dwelling unit in an R-2 compact residential zone; appeals are due by September 14, 2026.

    Sept. 2, 2026 · 2 pages · 698 KB · PDS-Legal Notice

    Download Notice of administrative approval

Application

Photos

  • Photo pages showing a proposed parking area and an ADU location, submitted with the zoning certificate application.

    Aug. 4, 2026 · 4 pages · 35.1 MB · PDS-Photos

    Download Proposed parking photos

Correspondence

  • ACHD reports no street improvements required and lists traffic impact fee, driveway approach permit, and right-of-way permit requirements plus standard conditions of approval.

    Sept. 4, 2026 · 3 pages · 169 KB · PDS-Agency Comments

    Download Ada County Highway District comments
  • The Boise Fire Department reports no comments on the zoning certificate review, noting that building code requirements will apply and are best addressed at building permit stage.

    Sept. 4, 2026 · 1 page · 151 KB · PDS-Agency Comments

    Download Boise Fire Department comments
  • Boise Parks and Recreation reviewed the plans with Community Forestry and has no comments, as the proposed unit does not appear to impact existing mature trees.

    Sept. 4, 2026 · 1 page · 58 KB · PDS-Agency Comments

    Download Parks and Recreation comments
  • Public Works hillside and drainage review requiring a stormwater management plan approved before a building or grading permit is issued.

    Sept. 4, 2026 · 1 page · 134 KB · PDS-Agency Comments

    Download Public Works drainage comments
  • Public Works requires connection to the central sanitary sewer, notes that sewer is available in the adjacent alley, and warns that sewer capacity fees may apply at building permit issuance.

    Sept. 4, 2026 · 1 page · 65 KB · PDS-Agency Comments

    Download Public Works sewer comments
  • Veolia Water Idaho requires a separate water service line and meter for the new accessory dwelling unit, and a site plan submitted for review before approval.

    Sept. 4, 2026 · 1 page · 194 KB · PDS-Agency Comments

    Download Veolia Water Idaho comments on accessory dwelling unit water service
  • Water provider letter reporting available pressure and flow at a nearby hydrant for fire sprinkler design, to be attached to the plan sets.

    Aug. 4, 2026 · 1 page · 113 KB · PDS-Other Small Docs

    Download Veolia fire flow availability letter

Other documents

  • Noticing radius map

    Sept. 2, 2026 · 511 KB · PDS-Maps and Drawings

  • Statement of legal interest

    Aug. 4, 2026 · 191 KB · PDS-Statement of Legal Interest

  • Transmittal sheet

    Aug. 4, 2026 · 137 KB · PDS-Transmittal Agencies

  • Receipt

    July 28, 2026 · 131 KB · PDS-Receipts

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