ADU Impact Fees: Glendale vs Tempe

Does Glendale charge an ADU impact fee?

Streets impact fees do not apply to ADUs because state law (Ariz. Rev. Stat. 9-461.18) prohibits requiring street improvements. Glendale does charge standard building permit fees scaled to construction valuation, and unlike many cities, requires a separate water meter and new tap for every ADU, which generates meter and connection fees.

Why is Glendale's ADU water fee higher than other Arizona cities?

Glendale uniquely requires every ADU to have its own city water meter with a new tap to the water main in the street or right-of-way. Most Arizona cities permit ADUs to share the primary dwelling's meter and service, avoiding new connection fees. Plan for separate water meter and tap charges in your Glendale ADU budget.

How much are impact fees for a Tempe ADU?

Tempe does not charge a dedicated ADU impact fee. You pay standard building, plumbing, mechanical, and electrical permit fees based on construction valuation, plus water and sewer development fees only if a new meter or service is installed. Request a written fee estimate from Tempe Community Development before submittal.

Can Tempe charge me the full single-family impact fee for an ADU?

No. Under ARS 9-461.18 (HB 2720), fees that would effectively prohibit ADU construction are barred. Tempe applies its standard transportation, parks, and public safety impact fees to new principal-unit construction, not as a duplicate charge on accessory dwelling units sharing the existing lot.