What Homeowners Need to Know About Building an ADU in Vermont

Accessory Dwelling Units (ADUs) are becoming a popular solution for Vermont homeowners facing housing shortages, seeking rental income, or planning to age in place. These small, secondary homes on a property offer flexibility and financial benefits, but building one requires understanding Vermont’s specific rules and costs. This guide covers what every homeowner should know before starting an ADU project in Vermont.

Vermont Legal Basics for ADUs

Most towns in Vermont allow an ADU to be up to 900 sq. ft. or 30% of the main home’s habitable floor area — whichever is larger.

Town-by-town variations:

• Burlington: Up to 900 sq. ft.

• South Burlington: Up to 900 sq. ft. or 30% of the main home — whichever is larger.

• Hinesburg: Generally allows up to 900 sq. ft.; may allow more depending on the size of the primary home.

• Williston: Allows up to 30% of the home or up to 900 sq. ft. or up to 1,500 sq. ft., depending on the main house size.

  
  

Other requirements: You still need to meet local rules for height, setbacks, and provide approved water and wastewater capacity.

Permitting and Municipal Considerations

Even though Vermont permits one ADU by right, local municipalities have their own zoning rules and permitting processes. For example, towns like Hinesburg require homeowners to confirm that their property’s wastewater and well systems can support an additional unit. This often means submitting detailed plans and sometimes upgrading septic or water systems.

Zoning rules vary across towns. Some may have setbacks or height restrictions, while others might limit ADUs in certain neighborhoods. It’s essential to check with your town’s planning office early in the process to understand local requirements and avoid costly delays.

Key Cost Areas for Building an ADU

Building an ADU involves several major cost areas:

• Design: Hiring a designer to create plans that meet Vermont’s codes and your needs. Custom designs typically cost more but can maximize space and functionality.

• Utilities: Extending or upgrading water, sewer, and electrical connections. In rural areas, well and septic upgrades can be significant expenses.

• Construction: Labor and materials for building the structure, including foundation, framing, roofing, and interior finishes. Costs vary depending on size, materials, and site conditions.

  
  

On average, Vermont homeowners spend between $200,000 and $350,000 to build a fully finished ADU. Planning carefully and budgeting for unexpected expenses can help keep the project on track.

How Greenland Bends Supports Homeowners

Greenland Bends guides clients through every step of building an ADU in Vermont. From initial feasibility studies to final inspections, their team helps navigate legal requirements, design options, and construction challenges. They coordinate with local officials, manage permits, and connect homeowners with trusted contractors.

Their support includes:

• Assessing site conditions and municipal rules

• Creating tailored design plans that fit budgets and goals

• Managing utility upgrades and inspections

• Providing a clear timeline and cost estimates

  
  

This hands-on approach reduces stress and helps homeowners build ADUs that add value and meet their needs.

Take the Next Step with a Free Strategy Consultation

Building an ADU in Vermont can be a rewarding investment, but it requires careful planning and local knowledge. To help you get started, Greenland Bends offers a free

initial strategy consultation to discuss your property, goals, and options.

Contact Greenland Bends today to learn how an ADU can enhance your Vermont home and lifestyle.

Schedule A Free Consultation