ADU Impact Fees: Mesa vs Surprise
How do adu impact fees rules compare between Mesa, AZ and Surprise, AZ?
Mesa and Surprise have similar restriction levels.
Mesa, AZ
Maricopa County
Mesa charges development impact fees under Arizona Revised Statutes Section 9-463.05 for water, wastewater, parks, and public safety. HB 2720 requires that ADU impact fees be proportional to the ADU's service demand, not the full single-family rate. Mesa Utilities capacity fees apply when a new water meter is installed for an ADU.
View full Mesa rules →Surprise, AZ
Maricopa County
Under ARS § 9-463.05 and the ADU preemption at ARS § 9-461.18, Surprise cannot charge development impact fees on ADUs under 1,000 square feet, and fees on larger ADUs must be proportionate to the unit's actual demand on infrastructure. The Surprise Development Services Fee Schedule sets building permit and plan-check fees through the Community Development Department. Water and wastewater capacity fees apply only when a new tap is installed.
View full Surprise rules →Key Facts Comparison
| Fact | Mesa | Surprise |
|---|---|---|
| Fee Authority | ARS §9-463.05 | - |
| HB 2720 | Proportional ADU fees required | - |
| Water Meter | Capacity fee if new meter | - |
| Permit Fee | $500-$2,000 typical | - |
| State Exemption | - | ADUs < 1,000 sq ft exempt (ARS § 9-461.18) |
| Impact Fee Authority | - | ARS § 9-463.05 |
| Permit Fee Range | - | ~$500–$2,000 typical |
| Water/Sewer SDF | - | Only on new tap |
| Fee Schedule | - | Surprise Development Services |
Highlighted rows indicate differences between cities.
Mesa FAQ
How much are impact fees for a Mesa ADU?
Mesa impact fees vary by area and ADU size. Under HB 2720, fees must be proportional to the ADU's service demand, not the full single-family rate. Request a fee estimate from Mesa Development Services before submitting permits.
Do I need a separate water meter for my Mesa ADU?
Not required. Sharing the primary dwelling's water meter avoids Mesa Utilities capacity fees. A separate meter is optional but triggers a new meter installation fee plus capacity charges. Most homeowners share the meter unless they plan to rent the ADU separately.
Surprise FAQ
Are ADU impact fees waived in Surprise?
Yes for ADUs under 1,000 square feet. ARS § 9-461.18 prohibits Surprise from charging impact fees on small ADUs. Larger ADUs pay proportional fees based on the principal dwelling's square footage under ARS § 9-463.05.
What does an ADU permit cost in Surprise?
Building permit and plan-check fees typically total $500–$2,000 for a small ADU sharing the main house's utilities. New water/sewer tap System Development Fees add several thousand dollars. Check the Surprise Development Services Fee Schedule for current rates.
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