Townhouse Zoning Rules and Requirements
Townhouses usually need a residential zone that allows attached single-family homes, such as a townhouse district, a medium-density R-2 or R-3 zone, or a planned development. Most R-1 zones limited to detached houses don't allow them, and whether R-2 does depends on the city.
New to zoning types? Read what residential zoning means and what it allows.
What zoning does a townhouse need?
R - Residential
Is a townhouse allowed in Columbus?
Open the Columbus zoning map to find a property's zoning district, then check what that district allows.
Check zoning in Columbus, OH →
Can You Build Townhouses on R-2 Zoning?
Sometimes. In many codes R-2 is a two-family district that allows duplexes but not rows of three or more homes. In others, R-2 is a medium-density district that lists "single-family attached" or "townhouse" as a permitted use. The district name alone won't tell you.
| Zone type | How townhouses are usually treated |
|---|---|
| Single-family detached (R-1, RS) | Usually not allowed, unless a state law or local reform opens the zone |
| Two-family (often R-2) | Varies; some allow attached homes, many stop at duplexes |
| Townhouse or attached residential (RT, RA) | Allowed; the district exists for them |
| Multi-family (R-3, RM) | Usually allowed |
| Planned development (PUD) | Allowed if the approved plan includes them |
Search the use table for "single-family attached," "townhouse" or "rowhouse." Our residential zoning guide explains how residential districts are usually tiered.
How Codes Define a Townhouse
Under the International Residential Code definitions, a townhouse is a building with three or more attached townhouse units. Each unit is a single-family dwelling that runs from foundation to roof and has a yard or public way on at least two sides.
Two attached homes usually don't count. Codes tend to call that a duplex or a twin home, which has its own rules in our duplex zoning guide. Zoning codes may use their own definition, so check the local version too.
Townhouse Lot Size and Dimensional Rules
Townhouse zoning rules focus on narrow lots and long buildings. Common requirements include:
- A minimum lot width and lot area per unit, smaller than for detached homes
- No side setback between attached units, but a side setback for end units
- A limit on how many units can sit in one row before a break
- Front and rear setbacks, height limits and open space per unit
- Parking per unit, often in a garage or rear lot
Because every unit runs to the roof, building codes also require fire-resistant walls between units. The setback calculator and parking calculator help you test a site layout.
Fee-Simple vs. Condo Townhouses
How the homes will be owned changes the approval. For fee-simple townhouses, each owner holds the land under the unit, so the site has to be subdivided into one lot per unit. That means a subdivision plat on top of the zoning approval. Shared areas like driveways and landscaping usually go to an HOA.
Condominium townhouses sit on one parcel. Owners hold their unit plus a share of the common land, so no lot-by-lot split is needed. Some zoning codes apply the same rules either way, and some only allow one form in certain districts.
State Laws Opening Single-Family Zones
A few states now require cities to allow townhouses where only detached homes were allowed before. In Oregon, cities over 25,000 people and cities in the Portland Metro region must allow townhouses outright in residential areas, along with duplexes, triplexes, quadplexes and cottage clusters, according to the state's housing choice program. Ask your planning department whether a similar rule applies where you're building.
Steps in Townhouse Planning
- Search for your city's zoning map and confirm the district allows attached single-family homes.
- Divide the lot width by the minimum unit width to estimate the number of units.
- Decide on fee-simple or condo ownership, since that sets whether you need a subdivision.
- Expect site plan review for drainage, access and utilities.
For stacked units instead of side-by-side, compare the rules for a triplex.
Townhouse Zoning FAQ
Is a townhouse considered a single-family home?
Often, yes. Building codes and many zoning codes treat each townhouse unit as a single-family dwelling that happens to share walls. Zoning maps usually still keep them out of districts limited to detached homes.
What is the difference between a townhouse and a condo?
A townhouse is a building type, and a condo is a form of ownership. A townhouse can be owned fee-simple with its own lot or as a condo unit on a shared parcel.
Can I build a single townhouse on one lot?
Not usually on its own. A townhouse unit is attached to its neighbors, so it's built as part of a row, though some codes allow infill units that attach to an existing row.
Do townhouses need an HOA?
Zoning doesn't require one, but cities often require an HOA or maintenance agreement when a project has shared driveways, open space or stormwater systems. See our multi-family zoning guide for larger projects.