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Independence, MO Accessory Structures: ADU Rules (2026)

Some Restrictions

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

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

Key Facts

ADUs per lot: one
Size cap: 50% of home or 1,200 sq ft
Where allowed: HSQ Downtown Neighborhood sub-district only
Occupancy rule: owner must live on-site

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 Missouri under recent ADU streamlining laws. The Independence, MO rules below cover local size, height, and setback requirements.

Summary

In Independence's Historic Downtown Square District, one accessory dwelling unit per lot is allowed inside the main house or an existing accessory building, capped at 1,200 square feet, with the owner required to live on-site.

Where permitted, secondary dwelling units accessory to the principal residential use are subject to the following standards:a)One accessory dwelling unit is allowed per lot.b)ADUs shall be located within the principal building (such as an attic or basement apartment), or within an existing detached accessory building.c)The accessory dwelling shall not exceed 50% of the living area of the principal dwelling unit, or 1,200 square feet, whichever is less.d)Accessory dwelling units must meet all city building codes.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 13).

Full Breakdown

Independence UDO § 14-901-04-B permits accessory dwelling units only within the Historic Downtown Square ('HSQ') district's Downtown Neighborhood sub-district, where detached houses are allowed. One ADU per lot is permitted, built inside the principal dwelling, an attic or basement unit, or inside an existing detached accessory building; new detached ADU structures aren't listed as a compliant option. The unit is capped at 50% of the main home's living area or 1,200 square feet, whichever is smaller, must meet city building codes, and the property owner must occupy either the main house or the ADU as a permanent residence.

Violations & Fines

Building or occupying an ADU that exceeds the size cap, sits in a new detached structure, or lacks owner-occupancy on-site risks permit denial, code enforcement action, and loss of the certificate of occupancy.

Frequently Asked Questions

Can I build a detached ADU anywhere in Independence?

Only within the Historic Downtown Square district's Downtown Neighborhood sub-district can an ADU go in an existing detached accessory building; new detached ADU structures aren't listed as a compliant location.

Do I have to live in the ADU or the main house?

Yes: the property owner must occupy either the principal dwelling or the accessory unit as their permanent residence; the ordinance doesn't allow renting out both.

Sources & Official References

[1]Independence, MO Unified Development Ordinance (Municode)

Other rules in Independence

Parking Rules: Street Parking LimitsSome Restrictions Noise Ordinances: Quiet HoursSome Restrictions Animal Ordinances: Chickens & LivestockSome Restrictions Fence Regulations: Height LimitsSome Restrictions Shed & Carport RulesSome Restrictions ADU Owner OccupancySome Restrictions Tiny HomesSome Restrictions ADU Rental RestrictionsSignificant Restrictions Fire Regulations: Smoke DetectorsSome Restrictions Fire Regulations: FireworksSignificant Restrictions

All Independence rules

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

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