ADU Rules in Morrisville, Vermont

Morrisville is the shire town (county seat) of Lamoille County in north-central Vermont, situated on the Lamoille River approximately 10 miles north of Stowe Mountain Resort. The village of Morrisville sits within the Town of Morristown, and the two are administered separately for zoning and land use purposes. Morrisville functions as the commercial and governmental hub of Lamoille County, with a population of roughly 2,100 in the village proper.

Vermont Act 47 (2023) — ADU Rights Statewide

Vermont Act 47 (2023) requires all Vermont municipalities to allow at least one ADU by right on any residential lot containing a single-family or two-family dwelling in residential zones. For Morrisville property owners, this means:

• ADUs must be permitted without a public hearing, variance, or conditional use permit, provided objective dimensional standards are met
• The village may maintain local standards for setbacks, maximum size, and height, but cannot use subjective criteria to block code-compliant ADUs
• Both attached and detached ADUs are covered by the by-right requirement

ADU Types Permitted

• Attached ADUs — in-law suites, basement apartments, or additions to the primary dwelling
• Detached ADUs — freestanding backyard cottages or garage/outbuilding conversions
• Garage conversions — converting existing garages into habitable living units
• Interior ADUs — second units created within the existing primary dwelling footprint

Size, Setbacks, and Height

Morrisville's zoning bylaws establish local dimensional standards for ADUs. Typical Vermont village standards include:

• Maximum ADU floor area (commonly 30% of the primary dwelling's gross floor area or an absolute cap — confirm current local standard)
• Rear and side yard setback requirements for detached ADUs
• Height limits consistent with the accessory structure provisions of the applicable zoning district

Contact the Village of Morrisville Zoning Administrator for current dimensional requirements.

Stowe Proximity — Short-Term Rental Considerations

Stowe Mountain Resort is approximately 10 miles south of Morrisville, and the area experiences significant ski-season demand for rental housing. Homeowners sometimes consider ADUs as short-term rental (STR) units for ski visitors. Important distinctions apply:

• An ADU building permit authorizes the construction of the accessory unit as a dwelling — it does not license short-term rental use
• Vermont Meals and Rooms Tax registration is required for STR operators renting for fewer than 30 consecutive days
• Any local STR licensing or registration requirements adopted by Morrisville or Morristown must also be satisfied
• Zoning may distinguish between long-term rental ADUs and STR-use ADUs; confirm with the Zoning Administrator whether STR use is allowed in the applicable zone

Do not assume that Act 47 ADU approval also authorizes short-term rental operation.

Lamoille River — Flood and Fluvial Erosion Hazard Zones

The Lamoille River flows through Morrisville and is subject to:

• FEMA Special Flood Hazard Areas (SFHAs): ADUs in SFHAs must be elevated to or above the Base Flood Elevation and require a floodplain development permit.
• Vermont ANR Fluvial Erosion Hazard (FEH) Zones: The Lamoille River has active FEH zone designations. Properties within the river corridor may face setback requirements of 50+ feet from the channel. Check the Vermont ANR Natural Resources Atlas at anrmaps.vermont.gov for current FEH boundaries.

The Lamoille is a dynamic river that experienced significant flooding during the July 2023 Vermont floods. Updated FEH zone maps may reflect post-2023 reassessments for this watershed.

Act 250 — Vermont Statewide Land Use

A single residential ADU in Morrisville does not typically trigger Act 250 review. Act 250 applies to larger developments and land disturbances exceeding applicable thresholds.

Permit Process

1. Confirm flood zone and FEH zone status using Vermont ANR and FEMA maps
2. Contact the Village of Morrisville Zoning Administrator for current dimensional standards
3. Submit a zoning permit application with site plan and floor plans
4. Obtain a building permit under Vermont Fire & Building Safety Division requirements
5. Pass all required inspections and receive a certificate of occupancy
6. Separately, if STR use is intended, obtain all required Vermont and local STR licenses/registrations

Contact Information

Village of Morrisville Zoning Administrator

• Address: 43 Portland Street, Morrisville, VT 05661
• Phone: (802) 888-6373
• Website: villageofmorrisville.org

Disclaimer: Zoning regulations and state law change frequently. This page is provided for general informational purposes only. Always verify current ADU requirements with the Village of Morrisville Zoning Administrator and consult a licensed Vermont architect or contractor before beginning any project.