Zoning › State preemptions › Montana

Montana HB 819 — Minimum Lot Size Cap in Cities >=5,000 (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 337 — Parking Minimum Cap for Multifamily Near TransitMontana SB 245 — Density Restriction Preemption in Residential ZonesMontana Property Tax Mill Levy Cap

Trigger predicate

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

AND
  • city.population ≥ 5000
  • 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].min_lot_size_sfcap_at2500
base_districts[category=res_mf].min_lot_size_sfcap_at2500
base_districts[category=res_th].min_lot_size_sfcap_at2500

Citation

Authority source
Montana HB 819 (2023) — codified at MCA Title 76, Chapter 2
§ HB 819 §1–2
https://leg.mt.gov/bills/2023/billpdf/HB0819.pdf

Research notes

Caps minimum lot size at 2,500 sf for residential lots in cities with population >=5,000. Cities may not impose larger minimum lot sizes as a condition of residential development.