How does zoning work in Indianapolis given the city-county consolidation?

Since the 1970 Unigov consolidation, nearly all of Marion County (Indianapolis) is governed by a single Unified Development Ordinance administered by the Department of Metropolitan Development, rather than separate city and county codes; a small number of independently incorporated "included towns" within the county retain their own zoning.

Can I build a duplex or ADU on a single-family lot in Indiana?

It depends entirely on the municipality — Indiana has no statewide law requiring cities to allow ADUs or missing-middle housing types. Some cities, like Carmel, have liberalized their codes to allow more housing types by right, while others still require a special-use permit or don't address ADUs at all.

How do I look up zoning for a parcel in Indiana?

Zoning maps are published individually by each city, town, or county plan commission — for example, Indianapolis's UDO map via the Department of Metropolitan Development. Indiana has no single statewide zoning lookup tool, though the Indiana Geographic Information Office aggregates county parcel data statewide.

Indiana · state zoning reference · Parcel data · lookup only

Indiana zoning: how it works and what you can build

Indiana's 1980s Home Rule Act gives cities and counties broad implied zoning powers, and metro Indianapolis's 1970 Unigov consolidation means a single Unified Development Ordinance governs zoning across nearly all of Marion County.

How zoning works in Indiana

Indiana granted local governments home rule through the Home Rule Act (Indiana Code 36-1-3), which reverses the traditional Dillon's Rule presumption: cities, towns, and counties may exercise any power not expressly denied by state statute, rather than only powers expressly granted. Zoning itself is enabled separately by Indiana Code Title 36, Article 7 (Planning and Development), Chapter 4 (Local Planning and Zoning), which requires an adopting jurisdiction to establish a plan commission and board of zoning appeals and to follow statutory notice-and-hearing procedures for ordinance and map amendments.

Indianapolis is a special case in Indiana zoning administration: the 1970 Unigov consolidation merged most City of Indianapolis and Marion County government functions, and today the Department of Metropolitan Development administers a single Unified Development Ordinance (UDO) covering nearly all of Marion County (a handful of independently incorporated "included towns" retain their own zoning). Indiana has no statewide ADU mandate — unlike states such as California, Oregon, or Idaho, Indiana has not passed a law requiring cities to allow ADUs — so rules vary widely by municipality. Fast-growing Indianapolis suburbs like Carmel (which consolidated its own zoning and subdivision rules into a single Unified Development Ordinance in 2017) have proactively liberalized their codes, while many other Indiana municipalities still treat ADUs as special-use exceptions or don't address them at all.

For developers, the practical split is geographic: metro Indianapolis (Marion, Hamilton, Johnson, and Hendricks counties) and the Fort Wayne/Allen County area have modernized, actively administered development codes, while many of Indiana's smaller counties still run basic zoning with limited planning staff capacity — so pre-application coordination timelines vary sharply by jurisdiction.

Who holds the zoning power

Land-use authority in Indiana is delegated by statute, not assumed — these are the acts a zoning ordinance in Indiana has to trace back to.

Home Rule Act Indiana Code 36-1-3: Grants cities, towns, and counties all powers not expressly denied by state statute, reversing Dillon's Rule
Local Planning and Zoning Indiana Code Title 36, Article 7, Chapter 4: Enables adoption of comprehensive plans and zoning ordinances via a plan commission and board of zoning appeals

Major cities and their codes

The enabling act sets the ceiling; the municipal code is what a project is actually reviewed against. The 7 largest Indiana jurisdictions and the codes they administer:

Indiana — municipal zoning codes
City	Zoning code
Indianapolis	Unified Development Ordinance (UDO) Administered by the Dept. of Metropolitan Development; covers nearly all of Marion County following the 1970 Unigov city-county consolidation.
Fort Wayne	Fort Wayne Zoning Ordinance Coordinated with a separate Allen County Zoning Ordinance for unincorporated areas
Evansville	Evansville-Vanderburgh Zoning Ordinance Administered by a joint city-county area plan commission
South Bend	South Bend Zoning Ordinance Northern Indiana city undergoing active downtown and riverfront redevelopment
Carmel	Carmel Unified Development Ordinance Affluent Indianapolis suburb known for roundabout infrastructure and form-based downtown standards
Fishers	Fishers Unified Development Ordinance Fast-growing Hamilton County suburb with active mixed-use development
Bloomington	Bloomington Unified Development Ordinance University town with an active missing-middle housing debate

Recent reforms

State-level changes override or preempt what a local ordinance says — these are the Indiana reforms that move the numbers on a real site.

2017 Carmel Unified Development Ordinance Consolidated Carmel's zoning and subdivision regulations into a single form-based-leaning UDO

Parcel & GIS data

Indiana has no mandatory statewide parcel-zoning portal, though the Indiana Geographic Information Office aggregates a statewide parcel layer from county assessor data; Indianapolis/Marion County's consolidated GIS (IndyGIS) is a comparatively mature single-jurisdiction dataset given the Unigov structure.

Real parcel geometry is already loaded for Indianapolis and South Bend — see the zoning-by-city section above for a live district-and-parcel lookup there. That is not the same as a cited feasibility report: Chicago is still the only jurisdiction with bulk standards, § citations and a generated massing scheme.

Zoning by city

The statute sets who may zone; the city's own code sets what you can build. One guide per Indiana city below, explaining the district codes that appear on its zoning map — 71 district codes across Indiana so far.

Indiana zoning — common questions

Is Indiana a home-rule state?: Yes. Indiana's Home Rule Act (Indiana Code 36-1-3) reversed the presumption of Dillon's Rule: cities, towns, and counties may exercise any power not expressly denied by state statute, giving Indiana local governments broad, if unevenly used, discretion over zoning and land use.
How does zoning work in Indianapolis given the city-county consolidation?: Since the 1970 Unigov consolidation, nearly all of Marion County (Indianapolis) is governed by a single Unified Development Ordinance administered by the Department of Metropolitan Development, rather than separate city and county codes; a small number of independently incorporated "included towns" within the county retain their own zoning.
Can I build a duplex or ADU on a single-family lot in Indiana?: It depends entirely on the municipality — Indiana has no statewide law requiring cities to allow ADUs or missing-middle housing types. Some cities, like Carmel, have liberalized their codes to allow more housing types by right, while others still require a special-use permit or don't address ADUs at all.
How do I look up zoning for a parcel in Indiana?: Zoning maps are published individually by each city, town, or county plan commission — for example, Indianapolis's UDO map via the Department of Metropolitan Development. Indiana has no single statewide zoning lookup tool, though the Indiana Geographic Information Office aggregates county parcel data statewide.

Working in Indiana? Get on the list.

The parcel layer lands in the order demand does. Illinois went first because that's where the deals were; the next state is decided by who tells us what they're trying to underwrite. Tell us where you're building and what you wanted to run — you'll hear from us when Indiana opens, and sooner if we need a test parcel.

Keep reading

← All 50 states

Want to see the finished shape of this work? Illinois is live at parcel level — Illinois zoning and the 53-district Chicago reference.

Indiana zoning summaries on this page are provided for information, not legal advice. Confirm every project against the current adopted code for the jurisdiction and the statute as amended.