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Montana SB 245 — Density Restriction Preemption in Residential Zones (MT)

Tracked preemption from the Montana overlay bundle.

Overview

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Effective
2023-10-01
Sunset
—
Authority
state
Scope
state:MT
Other Montana preemptions
Montana SB 323 — Duplex By-Right in Cities >=5,000Montana SB 528 — ADU Statewide By-RightMontana SB 382 — Montana Land Use Planning ActMontana HB 819 — Minimum Lot Size Cap in Cities >=5,000Montana HB 337 — Parking Minimum Cap for Multifamily Near TransitMontana Property Tax Mill Levy Cap
Primary-source summary
SB 245 (2023)

Trigger predicate

When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.

parcel.base_zone_category ∈ {res_sf, res_mf, res_th}

Preempted fields

3 fields on the base district schema are rewritten when the trigger fires.

FieldOpValueNote
base_districts[category=res_sf].max_units_per_acrewaive—
base_districts[category=res_mf].max_units_per_acrewaive—
base_districts[category=res_th].max_units_per_acrewaive—

Citation

Authority source
Montana SB 245 (2023) — codified at MCA Title 76, Chapter 2
§ SB 245 §1
https://leg.mt.gov/bills/2023/billpdf/SB0245.pdf

Research notes

Removes local authority to cap dwelling units per acre in residential zones. Density is instead governed by lot size, setbacks, and building code envelope limits. Applies statewide to all residential zoning.