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Accessory Dwelling Unit (ADU) Permit in Rio Rancho, New Mexico

Rio Rancho zoning ordinance (Chapter 154) permits accessory dwelling units as an accessory use in residential zones, subject to size, lot area, and design standards. Requires both zoning compliance review and a building permit through the same Building Permit & Plan Review process as new construction.

Verified 2026-07-02 · Source

When you need this permit

  • Defined in Rio Rancho Municipal Code § 154.03 as a separate, complete housekeeping unit, attached or detached, not exceeding 900 square feet or 50% of the primary structure (whichever is greater), on a lot 7,000 square feet or greater, with a separate entrance, kitchen, sleeping area, and full bathroom facilities (not a mobile home)
  • Per § 154.70(A), accessory dwelling units are allowed in residential zones subject to design standards: shall not exceed the height of the primary structure or 24 feet, whichever is greater; exterior of any accessory dwelling unit over 250 sq ft must use materials/facade similar to the primary structure (over 600 sq ft must match materials/facade)
  • An additional parking space that does not block a two-car garage is required for an accessory dwelling unit
  • A second kitchen is permitted in the primary residence or the ADU, but not both
  • Building permit required through the standard Building Permit & Plan Review Application process, with plans reviewed against the 2021 IBC/IRC with New Mexico amendments

Required documents

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Fee schedule

Building Permit & Plan Review Application FeeResidential Building Permit & Plan Review Application form, City of Rio Rancho Development Services — same fee structure as new residential construction
65% of the Building Permit Fee (non-refundable)

Review timeline

Plan reviewTypical estimate — confirm current times with the Rio Rancho building department
~10–15 business days

How long did your Accessory Dwelling Unit (ADU) Permit permit actually take in Rio Rancho?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Foundation Inspection

    After excavation for footings is complete and reinforcing steel is in place, before concrete is poured

  2. 2

    Frame Inspection

    After framing, fire blocking, bracing, and rough MEP trades are complete and approved

  3. 3

    Final Inspection

    When the structure is complete and ready for occupancy

See the full Rio Rancho inspection guide — scheduling & re-inspection fees →

Tips

  • An ADU cannot exceed 900 square feet or 50% of the primary structure's size, whichever is greater, and the lot must be at least 7,000 square feet — verify both before submitting plans.
  • An ADU may not be constructed without an existing primary structure/dwelling unit on the lot (Rio Rancho Municipal Code § 154.70(A)(4)).
  • An additional parking space that does not block access to a two-car garage is required for the ADU.
  • Contact the Planning & Zoning Division at (505) 891-5005 to confirm your property's zoning district allows an ADU before applying for a building permit.

Frequently asked questions

An ADU requires zoning compliance with Rio Rancho Municipal Code § 154.70(A) design standards plus a standard building permit through the Building Permit & Plan Review Application process — the same process used for new residential construction.

In Rio Rancho, the published Building Permit & Plan Review Application Fee is: 65% of the Building Permit Fee (non-refundable). These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for an accessory dwelling unit (adu) permit in Rio Rancho typically runs 10–15 business days. This is an estimate, not a published figure — confirm current review times with City of Rio Rancho Development Services — Building Inspection Division at (505) 891-5005.

You'll need: Residential Building Permit & Plan Review Application; Site Plan showing ADU location, setbacks, and parking. See the required-documents checklist on this page for details on each.

Rio Rancho requires 3 inspection(s) for an accessory dwelling unit (adu) permit, in order: Foundation Inspection, Frame Inspection, Final Inspection. Schedule each through City of Rio Rancho Development Services — Building Inspection Division ((505) 891-5005).

Apply through City of Rio Rancho Development Services — Building Inspection Division at 3200 Civic Center Circle NE, Suite 130, Rio Rancho, NM 87144. Phone: (505) 891-5005, email: Permits@rrnm.gov. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://www.rrnm.gov/77/Building-Division.

Rio Rancho, New Mexico has adopted: 2021 International Building Code (IBC) — with New Mexico state amendments; 2021 International Residential Code (IRC) — with New Mexico state amendments; 2021 Uniform Mechanical Code (UMC) — with New Mexico state amendments; 2021 Uniform Plumbing Code (UPC) — with New Mexico state amendments; 2020 National Electrical Code (NEC) — with New Mexico state amendments; 2021 International Energy Conservation Code (IECC); 2021 International Existing Building Code (IEBC) — with New Mexico state amendments; 2017 ICC/ANSI A117.1 Accessibility Code; 2021 International Fire Code (IFC); 2012 Swimming Pool, Spa, and Hot Tub Code; Current New Mexico Administrative Code (NMAC) Title 14 construction code chapters, as adopted and amended by the Construction Industries Division; City of Rio Rancho Code of Ordinances, Title XV Land Use: Chapter 151 (Building Regulations), Chapter 152 (Flood and Erosion Control), Chapter 153 (Storm Drainage Requirements), Chapter 154 (Planning and Zoning). Local amendments apply — see the Rio Rancho overview page for the full list.

An accessory dwelling unit cannot exceed 900 square feet or 50% of the primary structure's floor area, whichever is greater, and the lot must be at least 7,000 square feet in area. Source: Rio Rancho Municipal Code § 154.03 (definitions) and § 154.70(A)(6).

Sources & verification

Verified against official sources. Last reviewed 2026-07-02.

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 Rio Rancho building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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Accessory Dwelling Unit (ADU) Permit in other cities

Albuquerque, New MexicoLas Cruces, New MexicoSanta Fe, New MexicoUnincorporated Bernalillo County, New MexicoArvada, ColoradoAurora, ColoradoBoise, IdahoBoulder, Colorado

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