Boise building & ADU permits
Recent permit activity, updated continuously.
Boise is Idaho's capital and largest city, setting ADU rules locally. Its residential-permit feed carries a structured 'ADU' living-units flag, making Boise one of Igni's highest-yield sources for cleanly identified accessory-dwelling permits; with no ZIP field, each record is reverse-geocoded from its location.
Igni is tracking 320 residential and building permits in Boise, ID — including 55 classified accessory-dwelling-unit (ADU) filings. The most active ZIP is 83709. The most recent filing Igni tracked was Sep 11, 2026. All records come from City of Boise open data (ArcGIS), an official government open-data feed, and are refreshed continuously.
320
Permits tracked
55
ADU permits
9
Distinct ZIP codes
Sep 11, 2026
Newest permit
Recent permits
A sample of the freshest permits in this jurisdiction — ZIP and city only (no street addresses).
| ZIP | Permit type | ADU type | Valuation | Applied |
|---|---|---|---|---|
| 83712 | Residential | Unknown | — | Feb 26, 2026 |
| 83712 | Residential | — | — | Feb 26, 2026 |
| 83706 | Residential | — | — | Jul 8, 2026 |
| 83702 | Residential | — | — | Jul 8, 2026 |
| 83709 | Residential | Unknown | — | Jul 2, 2026 |
| 83716 | Residential | — | — | Jul 31, 2026 |
| 83709 | Residential | — | — | Aug 13, 2026 |
| 83709 | Residential | — | — | Jun 17, 2026 |
| 83709 | Residential | — | — | Jun 19, 2026 |
| 83712 | Residential | — | — | Feb 7, 2026 |
| 83703 | Residential | — | — | Jul 30, 2026 |
| 83704 | Residential | — | — | Jun 17, 2026 |
| 83704 | Residential | — | — | Jun 18, 2026 |
| 83704 | Residential | — | — | Jun 18, 2026 |
| 83716 | Residential | — | — | Jul 29, 2026 |
| 83716 | Residential | — | — | Mar 5, 2025 |
| 83705 | Residential | Unknown | — | Jun 12, 2026 |
| 83709 | Residential | — | — | Aug 14, 2026 |
| 83709 | Residential | — | — | Aug 14, 2026 |
| 83709 | Residential | — | — | Aug 13, 2026 |
Top ZIP codes by recent activity
ADU types in the recent set
Housing law — Idaho
Accessory dwelling units in Idaho are handled locally; with no statewide ADU mandate, requirements vary by city and county.
Idaho has no statewide upzoning law; residential density is determined by local zoning.
Boise ADU rules
Boise allows one accessory dwelling unit on most residential lots under its Modern Zoning Code — the city's first comprehensive zoning rewrite since 1966, effective December 1, 2023. ADUs may be attached, detached, or interior conversions, and the rewrite removed Boise's former owner-occupancy requirement, so an owner is no longer required to live on site to have an ADU.
A Boise ADU is generally limited to 900 square feet or 70 percent of the primary home's floor area, whichever is smaller, with a maximum of two bedrooms — an increase over the old code's tighter cap — and minimum-lot-size and density standards do not apply to ADUs. Height and setback requirements follow the underlying zone rather than ADU-specific numbers. No additional off-street parking is required, and a code-compliant ADU is approved administratively, without a conditional-use permit or public hearing.
To make building easier, Boise offers a free pre-approved ADU plan program — a catalog of ready-to-use detached designs (studio to two-bedroom) that removes most of the design cost and shortens the timeline. The city has continued to refine its housing rules since the rewrite, so the per-lot allowance and related standards are worth confirming before you build.
This is an informational summary — verify current rules with the city's planning/permitting department; not legal advice.
See also: Idaho ADU law and what is an ADU?
Data source
Sourced from City of Boise open data (ArcGIS). Public records (no declared open license).
Learn more about ADUs & building permits
Background reading on accessory dwelling units, building permits, and how Igni turns Boise permit records into leads.
Boise permit data — FAQ
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Informational only, not legal advice. Headline counts reflect all permits Igni has tracked for this jurisdiction; the table shows recent activity. Housing law changes — verify current statutes before relying on this.