Accessory Dwelling Unit (ADU) in Livingston, Montana
VerifiedAccessory dwelling units are legalized by right on any lot where a single-family dwelling use is allowed, per Montana Code Annotated 76-2-345 (enacted via 2023 Senate Bill 528) and codified locally through City of Livingston Ordinance No. 3056 (approved by the City Commission, effective ~January 2025, amending Municipal Code Chapter 30). There is no separate ADU permit application — ADU construction uses the standard Building Permit Application (Residential category), subject to the statutory size, parking, and fee constraints below.
Verified 2026-07-03 · Source
When you need this permit
- Municipalities must allow a minimum of one ADU by right on any lot containing a single-family dwelling, without public hearings or discretionary review, per MCA 76-2-345
- ADU size capped at 75% of the gross floor area of the primary single-family dwelling, or 1,000 sq. ft., whichever is less (detached or attached units; internal units have no statutory size cap)
- City may NOT require additional off-street parking, or a fee in lieu of parking, for an ADU
- City may NOT impose stricter building height, setback, lot size, lot coverage, or frontage requirements on an ADU than apply to the primary single-family dwelling
- City may NOT mandate matching exterior design/roof pitch/materials with the primary dwelling, require owner-occupancy of either unit, or require a familial/employment relationship between occupants
- Standard City of Livingston Building Permit Application and 2021 IBC/IRC review process applies to the structural scope, same as any residential addition or new accessory structure
Required documents
- Required
Building Permit Application
City of Livingston Building Department Permit Application (Residential category); no separate ADU-specific form was found published
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit Fee — valuation-based (same schedule as new construction/addition) | $23.50 minimum ($1.00-$500.00 valuation), scaling per the City of Livingston Fee Schedule Building Fees table | City of Livingston Fee Schedule (Resolution 5181, approved 2/03/2026) |
| One-time ADU application review fee (statutory cap) | Up to $250 per unit (statutory maximum); no distinct Livingston-specific ADU review fee line was found published separately from the standard building permit fee | MCA 76-2-345 |
| Impact fees on ADU construction | $0 — full waiver required by MCA 76-2-345 ('may not assess impact fees on the construction of an accessory dwelling unit'), which supersedes the City's older 2021 Impact Fee Schedule Exhibit A (that pre-statute document listed only a 50% ADU impact-fee reduction, not a full waiver) | MCA 76-2-345; City of Livingston Impact Fee Schedule (Exhibit A, 2021) — the 2021 PDF's 50% figure is superseded by the later-enacted statute and Ordinance 3056 |
Review timeline
1–10 business days
Livingston’s published plan-review target
Inspection process
- 1
Footing/Foundation
Required before concrete pour for detached ADU construction
- 2
Framing
Structural framing verified before walls are closed
- 3
Final
Completed ADU verified against approved plans
Tips
- GENUINELY UNPUBLISHED: no distinct ADU-specific permit application, checklist, or standalone fee schedule was found published by the City of Livingston Building & Planning Department as of this review — ADUs are processed through the ordinary Residential Building Permit Application, subject to the MCA 76-2-345 constraints (size cap, no parking mandate, full impact-fee waiver, $250 review-fee cap).
- The City's 2021 Impact Fee Schedule Exhibit A predates Ordinance 3056 and the statute's full impact-fee waiver — do not rely on the 2021 PDF's 50%-reduction figure for ADUs; the statute's 100% waiver controls.
- Ordinance 3056 (approved by City Commission, effective ~January 2025) also codified duplex legalization per a companion state law (2023 Senate Bill 323) in the same zoning-code amendment.
Frequently asked questions
- Can I build an accessory dwelling unit on my property in Livingston?
- Yes. Under Montana Code Annotated 76-2-345 and City of Livingston Ordinance No. 3056, at least one ADU is allowed by right on any lot with a single-family dwelling, without discretionary review. The ADU is capped at 75% of the primary dwelling's floor area or 1,000 sq. ft. (whichever is less), the City cannot require extra parking or impact fees for it, and it goes through the standard Building Permit process.
Sources & verification
Verified against official sources. Last reviewed 2026-07-03.
- City of Livingston Building & Planning Department (Building Division) — city-certified for Building and Swimming Pool permits only; Electrical, Plumbing, and Mechanical/HVAC permits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau — official building department
- MCA 76-2-345: Accessory dwelling units -- regulations -- restrictions
- City commissioners adopt new zoning code (ADUs & duplexes per SB 528 / SB 323) | Livingston Enterprise
- Impact Fee Schedule (PDF, Exhibit A, 2021) | City of Livingston
- Chapter 30 - Zoning | Code of Ordinances | Livingston, MT | Municode Library
- Building Permit Application (PDF) | City of Livingston
- MCA 50-60-106(2)(c) — 10-working-day permit/disapproval requirement for certified jurisdictions
Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Livingston building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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