NM HB 554 (2025) — Statewide ADU By-Right (Status: Pending Verification) (NM)
Tracked preemption from the New Mexico overlay bundle.
Overview
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Effective
None
Sunset
—
Authority
state
Scope
state:NM
Other New Mexico preemptions
WIPP (Carlsbad) Federal Radioactive Waste CorridorNMSA 3-21A — Manufactured Home Siting Non-DiscriminationMilitary AICUZ / Federal Installation Overlays (Kirtland AFB, Holloman AFB, WSMR, Cannon AFB)N.M. Const. Art. X § 6 — Constitutional Municipal Home Rule (Charter Cities)NMSA 3-21 — Municipal/County Zoning Enabling Act (Dillon's Rule Baseline)NMSA 3-21-2 / 3-21-6 — Extraterritorial Joint Zoning Authority (EZA/ELUC, SFEZO)Los Alamos County / LANL Federal–County Hybrid GovernanceFederal-Land Jurisdiction Carve-Out (BLM / USFS / NPS / State Trust Lands)
Primary-source summary
HB 554 (2025) — Residential Home Building Authorization (ADU vehicle)Trigger predicate
When this evaluates true for a parcel, the law's preempted fields take precedence over base zoning.
AND
parcel.base_zone_category∈ {res_sf,res_mf,res_th,mu}state.hb554_in_force==True
Preempted fields
2 fields on the base district schema are rewritten when the trigger fires.
| Field | Op | Value | Note |
|---|---|---|---|
base_districts[category=res_sf].allowed_uses | add | adu | Zoning authorities including home-rule cities must permit at least one ADU on single-family lots; local ordinances and HOA restrictions cannot delay or deny |
review_type | waive_discretionary | — |
Citation
Authority source
NM HB 554, 2025 Regular Session (Residential Home Building Authorization)
§ HB 554 §§1–4 (as introduced)
Research notes
STATUS: PENDING VERIFICATION. The 2026-05-18 state research dossier confirms HB 554 was introduced as NM's first by-right ADU mandate but available session-tracking sources confirm neither enactment nor definitive failure. Re-verify via Legiscan + the 2025 Signed/Chaptered Bills index before treating the ADU mandate as in-force. Until confirmed, NM remains a categorical-override state only via NMSA 3-21A. Trigger predicate gated on state.hb554_in_force flag so this overlay activates only after enactment confirmation. Earlier briefs that cited HB 56 or SB 9 as the ADU vehicle were misattributed (HB 56 = Medicaid Birth Centers, SB 9 = Pipeline Safety Act).