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Valencia County, NM Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

ADU rules in Valencia County, NM, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Secondary dwelling definition: caretaker, health-care, farm-worker or guest-house unit
Density cap: 1 secondary dwelling per parcel
Guest houses: excluded from the 1-per-parcel cap
Special-care mobile home permit: valid up to 2 years
Minimum parcel for special-care unit: 0.76 net acres

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in New Mexico under recent ADU streamlining laws. The Valencia County, NM rules below cover local size, height, and setback requirements.

Summary

Code § 154.006 defines a SECONDARY DWELLING as a caretaker, health-care, farm-worker or guest-house unit accessory to a main home, and § 154.105(F)(1)(b) caps the Rural Residential Districts at one secondary dwelling per parcel, with guest houses excluded from that cap. A temporary mobile home for a family member needing special care is separately allowed as a conditional use on parcels of at least 0.76 net acres.

These county ordinances apply to unincorporated areas of Valencia County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

SECONDARY DWELLING. A dwelling other than a principal dwelling, used for a caretaker, health care or farm worker residence, guest house or similar use accessory to the principal residence. ... (b) Dwelling density for conditional uses. Not more than 1 secondary dwelling (other than guest house secondary dwelling) shall be permitted on any parcel.

View official code

Full Breakdown

006 defines a SECONDARY DWELLING as any dwelling other than the principal one used for a caretaker, health-care or farm-worker residence, a guest house, or a similar accessory use. 105(F)(1)(b) limits a parcel to one secondary dwelling, but guest-house secondary dwellings are excluded from that one-per-parcel cap, so a caretaker unit and a separate guest house can potentially coexist on the same lot. 105(C)(1) allows a temporary secondary mobile home or residential trailer as a conditional use when a family member requiring special care is aged, infirm, or unable to maintain a separate residence for health reasons.

076, is valid for up to 2 years or a shorter period the Zoning Department sets, and can be revoked at any time if the qualifying condition changes or a permit condition is violated. The permit is issued to the applicant personally and does not run with the land, so a sale of the property ends it. 76 acres. 105 standard.

Violations & Fines

An unpermitted second dwelling, or a caregiver mobile home kept after the qualifying family member no longer needs it, is a Code violation under § 154.999: a petty misdemeanor for each day it continues, fined up to $300 with up to 90 days in jail, or both. The Zoning Department can revoke the § 154.105(C)(1) permit outright for a violated condition, in addition to issuing a citation with a 30-day cure period.

Frequently Asked Questions

Can I put a guest house or caretaker unit on my Valencia County property?

Yes. Code § 154.006 defines a SECONDARY DWELLING as a caretaker, health-care, farm-worker or guest-house unit accessory to the main residence, and § 154.105(F)(1)(b) limits parcels to one secondary dwelling, though guest-house secondary dwellings are carved out of that one-per-parcel cap.

Can I put a mobile home on my lot for an aging parent?

Yes, as a conditional use. Section 154.105(C)(1) allows a temporary secondary mobile home for a family member who is aged, infirm or unable to live independently, on a parcel of at least 0.76 net acres, under a permit valid for up to 2 years.

Does the caregiver mobile home permit run with the land?

No. Under § 154.105(C)(1)(c), the permit is granted only to the applicant and is not deemed to run with the land, so a new owner or a new caregiving situation must reapply through the county Zoning Department.

Sources & Official References

[1]Valencia County, NM Code of Ordinances (American Legal)

Other rules in Valencia County

Fence Regulations: Height LimitsSome Restrictions Shed & Carport RulesSome Restrictions Parking Rules: RV & Boat ParkingSome Restrictions Noise Ordinances: Aircraft NoiseSome Restrictions Animal Ordinances: Veterinary Clinic ZoningFew Restrictions Building Safety: Childcare Center RulesSignificant Restrictions Historic Preservation: Historic-Cultural MonumentsSome Restrictions

All Valencia County rules

How Valencia County compares: Easiest Cities to Build an ADU·Compare Valencia County to another location·View the New Mexico accessory structures overview

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