Everything homeowners ask about building an ADU in Chandler — answered with 2026 data.
Yes, ADUs are allowed in Any lot or parcel where a single-family dwelling is the principal use (Chandler City Code 35-2202.2, residential districts incl. AG-1, SF-D and others amended by Ord. 5113) in Chandler, AZ. The maximum size for a detached ADU is 75% of the single-family dwelling's gross floor area (interior habitable area) or 1,000 sq ft, whichever is less. Attached ADUs can be up to 75% of the single-family dwelling's gross floor area or 1,000 sq ft, whichever is less. Chandler has an ADU-friendliness score of 6/10. Check our full Chandler ADU rules page for complete zoning details.
ADU construction in Chandler typically costs $125,000-$250,000. The cost per square foot averages $140-$280. Garage conversions are more affordable at $60,000-$140,000, while prefab ADUs cost $85,000-$200,000. Permit fees add Valuation-based per Chandler fee schedule using ICC Building Valuation Data (minimum permit fee $60); third-party guides estimate roughly 1.5-2% of construction value plus plan review — confirm exact amounts with Chandler Development Services to your budget. See our detailed Chandler ADU cost guide.
Detached ADUs in Chandler can be up to 75% of the single-family dwelling's gross floor area (interior habitable area) or 1,000 sq ft, whichever is less. Attached ADUs are limited to 75% of the single-family dwelling's gross floor area or 1,000 sq ft, whichever is less. Junior ADUs (JADUs) have a cap of Not a defined category in Chandler; internal ADUs follow standard ADU rules. Maximum height is Same as the building height limit of the underlying zoning district. You are allowed up to 1 attached + 1 detached per lot; a 3rd detached ADU allowed on lots of 1+ acre if at least one ADU is deed-restricted affordable (80% AMI) on a qualifying lot.
Rear setback: 5 feet minimum (uninhabitable space attached to an ADU, e.g. a garage, must meet full district setbacks). Side setback: 5 feet minimum. Front setback: Same as front yard setback of the underlying zoning district. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
No additional parking may be required for ADUs under AZ HB 2720 (ARS 9-461.18); Chandler's prior 1-space ADU requirement was superseded by Ord. 5113. Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Not required. 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 Chandler is typically Confirm with Chandler Development Services (480-782-3000). The plan check process takes approximately Confirm with Chandler Development Services. Pre-approved plans availability: No city pre-approved ADU plan program identified as of June 2026 — confirm with Chandler Planning Division.
Average ADU rental income in Chandler: 1-bedroom units rent for $1,350-$1,700/mo/month, 2-bedroom units for $1,600-$2,000/mo/month. Short-term rentals: Not addressed in ADU section 35-2202.2; Chandler requires short-term rental licensing citywide (City Code Chapter 22) and previously prohibited STR use of ADUs — confirm with Chandler Planning Division. Expected ROI: 6-9% annual return.
The minimum lot size for an ADU in Chandler is None specified in 35-2202.2; lots with an ADU cannot be split unless each resulting lot meets district minimums. 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 Chandler, 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.