R-1 Zoning

R-1 zoning — or its equivalent under different local naming conventions — is the most restrictive residential zone type, designating land for detached single-family homes on individual lots with no shared walls, no apartments, and no commercial uses. R-1 zones typically require the largest minimum lot sizes, the greatest setbacks from property lines, and the lowest maximum lot coverage percentages among residential zone tiers. Duplexes, apartments, and most other multi-unit housing types are not permitted by-right in a traditional R-1 zone, though many states have enacted laws that mandate cities allow ADUs and additional unit types in these zones regardless of local restrictions.