Everything homeowners ask about building an ADU in Las Vegas — answered with 2026 data.
Yes, ADUs are allowed in U (Undeveloped), R-A (Ranch Acres), R-E (Residence Estates), R-D (Single Family Residential-Restricted), and R-1 (Single Family Residential) — Special Use Permit required in each (Title 19.12, Accessory Structure Class I) in Las Vegas, NV. The maximum size for a detached ADU is No separate ADU cap; total floor area of ALL accessory structures limited to 50% of the principal dwelling's floor area, and ground floors of accessory buildings may not cover more than 50% of the rear yard (19.08.040). Attached ADUs can be up to Counts toward the same 50%-of-principal-dwelling accessory structure limit (19.08.040). Las Vegas has an ADU-friendliness score of 4/10. Check our full Las Vegas ADU rules page for complete zoning details.
ADU construction in Las Vegas typically costs $130,000-$250,000. The cost per square foot averages $140-$280. Garage conversions are more affordable at $60,000-$140,000, while prefab ADUs cost $90,000-$200,000. Permit fees add Special Use Permit reported at $1,030 ($500 application + $500 notification + $30 recording, per Las Vegas Review-Journal) plus valuation-based building permit fees — confirm current fee schedule with the city to your budget. See our detailed Las Vegas ADU cost guide.
Detached ADUs in Las Vegas can be up to No separate ADU cap; total floor area of ALL accessory structures limited to 50% of the principal dwelling's floor area, and ground floors of accessory buildings may not cover more than 50% of the rear yard (19.08.040). Attached ADUs are limited to Counts toward the same 50%-of-principal-dwelling accessory structure limit (19.08.040). Junior ADUs (JADUs) have a cap of Not a defined category in Las Vegas; interior conversions with kitchens fall under Accessory Structure Class I rules. Maximum height is 2 stories / 35 ft maximum, or the height of the main building, whichever is less (19.08.040). You are allowed up to 1 accessory dwelling per property on a qualifying lot.
Rear setback: 3 feet minimum for detached accessory structures, plus 6-ft separation from the main dwelling; no setback required from a property line abutting an alley. Side setback: 3 feet minimum, plus 6-ft separation from the main dwelling; corner lots must match the main dwelling's street-side setback. Front setback: Detached accessory structures are not permitted in front of the primary structure. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
1 additional on-site parking space required beyond the normal requirement (Title 19.12 Class I standards). Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Required to rent: unless the principal dwelling is owner-occupied, a Class I accessory structure may not be offered or occupied as a rental unit. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Las Vegas is typically Confirm with Las Vegas Planning Department — the SUP hearing process adds months versus over-the-counter permits. The plan check process takes approximately Confirm with City of Las Vegas Building & Safety. Pre-approved plans availability: No city pre-approved ADU plan program identified as of June 2026.
Average ADU rental income in Las Vegas: 1-bedroom units rent for $1,150-$1,450/month, 2-bedroom units for $1,400-$1,750/month. Short-term rentals: No — accessory dwelling rental agreements must exceed 30 days (per Review-Journal reporting on area jurisdictions), and the city's separate short-term rental licensing regime applies. Expected ROI: 5-8% annual return.
The minimum lot size for an ADU in Las Vegas is Lot must exceed 6,500 sq ft (Special Use Permit minimum requirement). This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Las Vegas, a garage conversion typically costs $60,000-$140,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.