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Design review · Planning application

Two new homes with garage apartments approved to replace one house on small lot

The plan tears down an existing house and splits the lot into two. Each new two-story home gets a detached garage with a roughly 400-square-foot one-bedroom apartment above it. Approval was issued July 17 with conditions, including alley parking and a detached sidewalk.

ApprovedDRH26-00173Filed May 26, 2026Southeast Boise · 1427 S Colorado Ave+2 related filings
Site plan for Two new homes with garage apartments approved to replace one house on small 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 applicant plans to tear down the existing home at 1427 S Colorado Ave in Boise and build two detached single-family homes on two small lots. Each home gets a detached two-stall garage with a one-bedroom accessory dwelling unit of about 400 square feet above it. The buildings would be two stories with a roof peak around 23 feet, and parking would be reached from the alley.

Demolish existing home , Small lot 2 new SFD w ADU

Project name on file: 1427 S COLORADO AVE

Timeline

  1. July 28, 2026

    Appeal Period: Completed

  2. July 17, 2026

    Review Complete: Completed

  3. July 17, 2026

    DR: Complete

  4. June 26, 2026

    DR: In Review

  5. June 26, 2026

    Assign Reviewers: Completed

  6. June 23, 2026

    Review Complete: Corrections Required

  7. June 23, 2026

    DR: Corrections Required

  8. June 17, 2026

    DR: In Review

  9. June 17, 2026

    Assign Reviewers: Completed

  10. June 12, 2026

    Review Complete: Corrections Required

  11. June 12, 2026

    DR: Corrections Required

  12. June 2, 2026

    DR: In Review

  13. June 2, 2026

    Assign Reviewers: Completed

  14. May 28, 2026

    Fee Payment: Payment Received

  15. May 27, 2026

    Prescreen Review: Passed

  16. May 27, 2026

    Prescreen Review: In Progress

  17. May 26, 2026

    Application Submittal: ePlanReview

  18. May 26, 2026

    Application filed

Documents

Site plans

  • Cover sheet and site plan for a two-unit row house design review, with a drawing index, site information, setbacks, and contact details for the architect and builder.

    June 5, 2026 · 1 page · 1.1 MB · PDS-Maps and Drawings

    Download Cover sheet and site plan

Renderings

Plans

  • Floor plan of the upper floor for a row house unit, with area calculations for the main, upper and ADU floors and the garage.

    June 5, 2026 · 1 page · 637 KB · PDS-Maps and Drawings

    Download Upper floor plan
  • Roof plan sheet for the design review submittal, dated 5/28/2026, showing attic venting requirements and provided soffit and ridge vents for the roof areas.

    June 5, 2026 · 1 page · 357 KB · PDS-Maps and Drawings

    Download Roof plan with attic ventilation calculations and general notes
  • Sheet A-1-3 floor plans with area calculations for the main, upper and ADU floors, plus garage and unconditioned space, for a small-lot row house unit B.

    June 5, 2026 · 1 page · 451 KB · PDS-Maps and Drawings

    Download Upper floor plan and area calculations
  • Roof plan sheet A-1-4 showing attic venting requirements by roof section (garage, small lot, lower and upper roofs), with general construction notes.

    June 5, 2026 · 1 page · 354 KB · PDS-Maps and Drawings

    Download Roof plan with attic ventilation calculations and general notes
  • Exterior elevation drawings for a row house unit, showing north and south elevations with materials such as stucco, lap siding, asphalt shingle roofing, and cementitious trim, dated May 28, 2026.

    June 5, 2026 · 4 pages · 1.4 MB · PDS-Maps and Drawings

    Download Exterior elevations, sheet A-2.1
  • Landscape plan for a two-unit row house with open space, fencing, a class II tree, and a mobility plan showing bus stops and sidewalk access.

    June 5, 2026 · 1 page · 759 KB · PDS-Maps and Drawings

    Download Landscape and mobility plan, sheet L-0.1

Project narrative

  • Letter from the applicant's architect describing a proposal to demolish the existing house, split the lot, and build a new single-family home and a detached garage with an ADU on each lot.

    June 5, 2026 · 1 page · 92 KB · PDS-Letter of Intent

    Download Detailed letter of explanation

Decisions

Notices

  • City of Boise notice that staff approved two small lot single-family homes with accessory dwelling units and a demolition, under design review and zoning certificate, with appeal instructions.

    July 15, 2026 · 2 pages · 719 KB · PDS-Legal Notice

    Download Notice of approval for design review and zoning certificate

Application

Photos

  • Photos of the site and neighboring properties, including the existing residence to be demolished, submitted with the small lot row house design review.

    June 5, 2026 · 1 page · 3.1 MB · PDS-Photos

    Download Site photos, sheet G-1.2

Correspondence

  • July 17, 2026 letter from the Ada County Highway District applying its site-specific and standard conditions of approval to the duplex project under the design review application.

    July 17, 2026 · 13 pages · 906 KB · PDS-Agency Comments

    Download Ada County Highway District conditions of approval letter
  • Public Works requires a stormwater management plan, approved before any building or grading permit is issued, following the City of Boise 2019 Stormwater Design Manual.

    July 17, 2026 · 1 page · 138 KB · PDS-Agency Comments

    Download Drainage comments from Public Works
  • Boise Parks and Recreation, with Community Forestry, asks the applicant for an arborist assessment of trees proposed for removal and mitigation calculations for replacement trees.

    July 17, 2026 · 2 pages · 326 KB · PDS-Agency Comments

    Download Parks Department comments on tree removal and mitigation
  • Public Works sewer requirements: connect to central sanitary sewer, separate service line per home, sewer tap permit, and possible sewer capacity fees at building permit.

    July 17, 2026 · 1 page · 67 KB · PDS-Agency Comments

    Download Public Works sewer comments
  • Veolia requires a separate water service line and meter for the new ADU structure and asks that a site plan be submitted to its engineering team for review.

    July 17, 2026 · 1 page · 180 KB · PDS-Agency Comments

    Download Veolia Water Idaho comments on water service
  • Veolia Water Idaho reports available hydrant pressure and flow for the site (2,000 GPM at 20 PSI residual) and says the document must be attached to approved plan sets.

    June 5, 2026 · 1 page · 113 KB · PDS-Other Small Docs

    Download Veolia Water fire flow information

Other documents

  • Noticing radius map

    July 15, 2026 · 514 KB · PDS-Maps and Drawings

  • Transmittal to review agencies

    June 9, 2026 · 132 KB · PDS-Transmittal Agencies

  • Statement of legal interest

    June 5, 2026 · 103 KB · PDS-Statement of Legal Interest

  • Fee receipt

    May 28, 2026 · 135 KB · PDS-Receipts

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