ADU rules in Mesquite

Detached backyard ADUs are allowed as an accessory use, with no conditional use permit, in every residential zone: Agriculture, Rural Residential RE-1, RE-2 and RE-3, Single-Family (SF), Multi-Family MF-1 through MF-4, and also the CR-3 central business district. Each of those zone use tables lists 'Accessory dwellings' with an X in the Accessory column rather than the Conditional column. Mesquite's zoning definition expressly contemplates a unit 'detached from and on the same lot with a single-family dwelling'. Only one ADU is allowed per parcel, and they are prohibited in manufactured housing, mobile home and non-residential zones and their overlays unless specifically designated. A detached ADU must sit at least 10 feet from other buildings, meet the underlying zone's setbacks, and be reviewed and approved by the homeowners association where one applies.

Attached and internal ADUs are allowed on the same terms as detached ones. The code's definition covers a secondary unit 'added to, created within, or detached from' a single-family dwelling, and 9-7Y-4 states that an ADU directly attached to the principal dwelling is treated as an integral part of the main building, which means it takes the primary structure's setbacks rather than accessory-building setbacks. The same subsection expressly allows an ADU to be established on the upper floors of an existing residential building, so an internal or second-story conversion is on the table. The zone use tables draw no distinction between attached and detached accessory dwellings.

Mesquite caps the ADU at 1,000 square feet of habitable area or 60 percent of the primary unit's habitable area, whichever is smaller, so a 1,400 square foot house yields an 840 square foot ADU rather than the full 1,000. Height is capped at 35 feet, dropping to 14 feet within 6 feet of a property line, and in no case may the ADU be taller than the primary structure on the lot. The ADU also has to fit the underlying zone's development standards: in the SF zone that means a 7,000 square foot minimum lot, a 50 percent maximum roofed area, and 20 foot front, 5 foot side and 15 foot rear setbacks. Buildings must be separated by 10 feet, though an ADU may come within 3 feet of a property line if the public utility easement is released.

Owner occupancy is required both at application and on an ongoing basis, and it is the single biggest restriction in Mesquite's ADU rules. Before the building permit issues, the applicant must execute and record an owner-occupancy affidavit and title notice with the Clark County Recorder and give the city a copy. The affidavit states that the owner lives in either the principal dwelling or the ADU for more than six months each year and that the permit will be revoked if the ADU ever stops meeting code. The affidavit runs with the land and binds all current and future owners plus their assigns, beneficiaries and heirs. The code's OWNER-OCCUPIED definition adds proof requirements (voter registration, vehicle registration or similar) and bars the owner from ever renting out the designated owner-occupied unit, with any such rental voiding the permit. Nevada's 2025 ADU statute does not preempt this, because Mesquite falls below the statute's population threshold.

The ADU needs one off-street parking space in addition to whatever the principal dwelling already requires. In the single-family zone the primary home needs two off-street spaces per dwelling unit, so a lot with an ADU has to provide three. Garage spaces count toward the requirement, and a 20 foot garage apron dedicated to a unit may be counted as a space. Parking in the front yard is only allowed on a paved driveway, and no more than half the width of the front yard may be used as driveway. Each space must be at least 9 by 19 feet. This one-space exaction happens to match the ceiling Nevada's NRS 278.257 imposes on covered jurisdictions, but Mesquite is not covered, so the match is coincidental rather than compelled.

An ADU is an administrative, over-the-counter approval in Mesquite: no planning commission hearing and no conditional use permit. Every residential zone use table lists 'Accessory dwellings' in the Accessory column rather than the Conditional column, and the definitions section says ADU compliance 'will be implemented through the building permit process'. Section 9-7Y-4 likewise conditions a tiny-home ADU on 'issuance of a building permit', and the owner-occupancy affidavit must be recorded 'prior to the issuance of a building permit by the administrator'. The practical path is the Building Division's Residential Accessory Permit package (application, three plot plans, three sets of drawings, plus structural, energy and electrical calculations, and a soils report if the structure is over 600 square feet), a $40 submittal fee and roughly 10 to 21 working days of plan review. HOA review and approval is required on top of that where a homeowners association applies.

Renting out the ADU long term is the point of the ordinance: the code lists gaining 'the extra income necessary to help meet the rising costs of home ownership' among the stated purposes for allowing ADUs. What cannot be rented is the unit the owner has designated as owner-occupied, and renting it voids the ADU permit. Short-term use is a separate regime. A 'vacation home rental' is any residential dwelling or portion of one rented for 2 to 27 consecutive days, and it requires a city vacation home rental license (a separate license per unit) that folds in transient occupancy licensing and the home occupation permit. Vacation home rentals only work in zones that list them, and every residential zone use table marks them Conditional, so a conditional use permit is required, except in subdivisions whose CC&Rs, bylaws or design standards handbook expressly permit home rentals. Room tax applies and license conditions cap overnight occupancy at 2 persons per sleeping room plus 2 more per property, up to 12. Separately, an ADU may never be sold apart from the whole property and may not be converted to condominium ownership.