Plymouth allows ADUs by right through an administrative permit under City Code §21190.04. Ordinance No. 2024-22 and Ordinance No. 2026-01 significantly expanded eligibility, from newer subdivisions only to essentially all single-family homeowners citywide.
| ADU type | Max size | Max height | Notes |
|---|---|---|---|
| Detached | 700 sq ft, or 30% of the rear yard area, whichever is less (minimum 200 sq ft) | Not clearly confirmed in available sources - confirm with the city | General accessory-building setback rules under Section 21120 likely apply, but exact figures were not confirmed |
| Attached / internal | 1,000 sq ft, or 30% of the primary home's floor area, whichever is less | Not clearly confirmed in available sources - confirm with the city | - |
Allowed zoning districts: FRD and RSF (single-family) districts, and single-family detached dwellings in RMF and PUD districts. Historically ADUs were limited to newer subdivisions in Plymouth; Ordinance 2024-22 (Sept 2024) and Ordinance 2026-01 (Feb 2026) expanded eligibility to essentially all single-family homeowners citywide.
| Setbacks & height | Not clearly confirmed in available sources. General accessory-building setback rules under Section 21120 likely apply - confirm exact figures with the Inspections Division. |
| Parking | Uncertain. Earlier drafts of the ordinance required additional off-street parking; more recent reporting suggests this requirement was removed, but we could not confirm the final current rule. Check with the city's Inspections Division. |
| Owner-occupancy | Required, confirmed by multiple local news sources |
| Short-term rentals | Banned (Airbnb/VRBO-style). Long-term rental of the ADU is allowed. |
| Units per lot | Typically one ADU per lot. Not explicitly confirmed in available sources, but consistent with every other Twin Cities city researched. |
| Permit process | Standard building/inspection permitting through the Inspections Division; no ADU-specific fee schedule was found |
Verify your property is in the FRD or RSF district, or is a single-family detached home in the RMF or PUD district.
ADUs are reviewed administratively under City Code §21190.04, not through a discretionary conditional use permit process.
Reviewed by the city's Inspections Division for zoning and building code compliance.
Complete the standard building permit and inspections process before occupancy.
No ADU-specific permit fee schedule or review timeline was found in available sources at time of writing - confirm current figures with the Inspections Division at 763-509-5430.