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Davenport, IA Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

ADU rules in Davenport, IA, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

State Mandate: One ADU per lot (SF 592)
Max Size: 1,000 sq ft
Placement: Detached, rear yard
Owner-Occupancy: Not required (state law)
Code: Chapter 17.08

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Iowa under recent ADU streamlining laws. The Davenport, IA rules below cover local size, height, and setback requirements.

Summary

Davenport must allow one ADU per single-family lot under Iowa's SF 592 (2025). City zoning caps ADUs at 1,000 square feet, detached in the rear yard. Owner-occupancy mandates are barred by state law.

No accessory dwelling unit may exceed 1,000 square feet in gross floor area.

Source: Davenport Municipal CodeView official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4820400; v43 updated 2026-03-11; through 03-11-2026).

Full Breakdown

Iowa's SF 592 (Iowa Code §364.3(20)), effective July 1, 2025, requires Davenport to allow at least one accessory dwelling unit on every single-family lot, caps ADU size at 1,000 square feet or 50% of the primary dwelling, and bars any owner-occupancy mandate. Davenport zoning Chapter 17.08 permits one ADU per lot, in a detached structure in the rear yard, up to 1,000 square feet of gross floor area, at the height allowed for a detached garage, with separate utility meters. A building permit and setback compliance under Chapter 17.09 apply. The city's older owner-occupancy condition is now overridden by state law.

Violations & Fines

Unpermitted ADU: stop-work order and retroactive permit with penalty fees. Occupying a unit without a certificate of occupancy is a code violation subject to abatement.

Frequently Asked Questions

Can I build an ADU in Davenport?

Yes. Iowa's SF 592 (2025) requires Davenport to allow at least one ADU on every single-family lot, and Chapter 17.08 permits a detached unit up to 1,000 square feet.

Do I have to live on-site to rent the ADU?

No. Iowa's 2025 ADU law bars owner-occupancy requirements, so Davenport cannot force you to occupy the property to have an ADU.

Sources & Official References

[1]Davenport Municipal Code

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All Davenport rules

How Davenport compares: Easiest Cities to Build an ADU·Compare Davenport to another location·View the Iowa accessory structures overview

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