Arizona State University: How large may an ADU be on a Tempe lot under one acre?
DIRECT ANSWER
Source guidance recorded on 2026-10-15. Confirm the applicable policy year, cohort and property jurisdiction before relying on time-sensitive facts.
The published maximum is the lesser of 75% of the main dwelling’s interior habitable floor area or 1,000 square feet; district lot-coverage standards also apply.
Sources & verification
- www.tempe.gov source-backed-recovered-record
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