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Springfield, OH Accessory Structures: ADU Rules (2026)

Some Restrictions

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

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

Key Facts

ADUs per lot: One maximum
Use classification: Limited Use in residential districts
Parking ratio: 1 space per dwelling unit
Height limit: Cannot exceed principal dwelling
Detached ADU placement: Rear of lot only

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 Ohio under recent ADU streamlining laws. The Springfield, OH rules below cover local size, height, and setback requirements.

Summary

Springfield allows one Accessory Dwelling Unit per lot as a Limited Use in its residential districts under Table 1104.03.1, at one parking space per unit, provided the ADU meets § 1107.05(a)'s setback, height, utility-connection, architectural-match and rear-yard placement standards for a detached unit.

(a) Accessory Dwelling Unit
(1) Only one Accessory Dwelling Unit is allowed on a lot. (2) An Accessory Dwelling Unit shall comply with the required setbacks and height requirements of the zoning district in which the unit is located. (3) An Accessory Dwelling Unit must not exceed the height of the principal dwelling. (4) An Accessory Dwelling Unit must connect utilities to those of the principal dwelling. ... (8) An ADU shall be architecturally consistent with the principal dwelling by having similar: A. Shape and style of exterior doors and windows; B. Building materials; C. Paint color(s); and
D. Roof style. (9) A Detached Accessory Dwelling Unit shall only be located in the rear of a lot.

View official code

Full Breakdown

Section 1107.05(a) of the Springfield Zoning Code sets numbered standards for an Accessory Dwelling Unit beyond the ownership rule addressed separately at § 1107.05(a)(5). Subsection (1) limits a lot to only one Accessory Dwelling Unit. Subsection (2) requires the ADU to comply with the required setbacks and height requirements of the zoning district in which it is located, and subsection (3) adds that it must not exceed the height of the principal dwelling. Subsection (4) requires the ADU to connect utilities to those of the principal dwelling rather than running an independent utility account.

Subsection (6) allows construction in forms provided in Figure 1107.05.1: ADU Types, and subsection (7) requires compliance with Table 1107.05.1: ADU Specifications, which sets minimum lot size and maximum ADU size by principal dwelling type. Subsection (8) requires architectural consistency with the principal dwelling in shape and style of exterior doors and windows, building materials, paint color(s), and roof style. Subsection (9) confines any detached ADU to the rear of a lot, foreclosing a front-yard or side-yard detached unit. Table 1104.03.1: Use Table classifies the ADU as a Limited Use in the city's residential districts, meaning it is permitted by right once these use-specific standards are met, with a parking ratio of one space per dwelling unit, rather than requiring Board of Zoning Appeals review.

Violations & Fines

An ADU built without a permanent utility connection to the principal dwelling, that exceeds the principal dwelling's height, that sits outside the rear yard when detached, or that mismatches the principal dwelling's exterior materials, doors, windows, paint, or roof style violates § 1107.05(a) and can be denied a certificate of occupancy by Community Development. Adding a second Accessory Dwelling Unit to a lot beyond the one allowed under § 1107.05(a)(1) is also a Zoning Code violation.

Frequently Asked Questions

How many ADUs can I build on one lot in Springfield?

Only one. Section 1107.05(a)(1) states that only one Accessory Dwelling Unit is allowed on a lot, regardless of lot size or the type of principal dwelling.

Can my detached ADU be taller than my house?

No. Section 1107.05(a)(3) requires an Accessory Dwelling Unit to not exceed the height of the principal dwelling, in addition to meeting the underlying zoning district's general height limit under § 1107.05(a)(2).

Where on my lot can a detached ADU go?

Section 1107.05(a)(9) requires a detached Accessory Dwelling Unit to be located in the rear of a lot, so a detached unit cannot be placed in a front or side yard even if setbacks are otherwise met.

Sources & Official References

[1]Springfield Codified Ordinances (American Legal)

Other rules in Springfield

Shed & Carport RulesSome Restrictions Parking Rules: RV & Boat ParkingSome Restrictions Tiny HomesSignificant Restrictions ADU Owner OccupancySome Restrictions Parking Rules: Driveway RulesSome Restrictions Parking Rules: EV ChargingSome Restrictions Animal Ordinances: Pet Groomer RulesSome Restrictions Animal Ordinances: Veterinary Clinic ZoningHeavy Restrictions Fire Regulations: FireworksHeavy Restrictions

All Springfield rules

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

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