Change of Use to Apartments or Multi-family Dwellings

If you intend to convert any structure—such as a garage, barn, basement, or single-family home—into an apartment unit or multi‑family dwelling, a formal Change of Use review is required before you advertise or rent the space. This ensures compliance with Warren’s Land Use Ordinance and applicable zoning standards.

What Triggers a Change of Use Review?

You must initiate a Change of Use application if you're planning to:

  • Add a second or more dwelling unit to a property (e.g. two‑family or multi‑family conversion);

  • Convert existing accessory space (garage, barn, basement, attic) into a rental unit (like an ADU or in‑law apartment);

  • Alter the use category of a structure previously not used for residential occupancy.

Under Warren’s Land Use Ordinance, any new or expanded multi‑family dwelling must meet dimensional and use requirements for the specific zoning district. This includes minimum lot size, setbacks, and permissible use types.

What the Review Covers

When you apply to change the use of a property, the Town will evaluate:

  • Zoning compliance: whether the new residential use is permitted in your zoning district;

  • Dimensional standards: ensuring setbacks, lot size, and building coverage meet ordinance requirements;

  • Site plan review: if your change of use involves new structures, parking, or over 20% change of activity, a site plan may be required under local ordinances.

  • Coordination with the Shoreland Zoning Ordinance, if your property is in a regulated buffer zone.

Step-by-Step Overview

Before renting the converted unit:

  1. Contact the Code Enforcement Office (CEO) for zoning verification and initial guidance.

  2. Submit a Change of Use application, including a plot plan or site layout showing unit locations, parking, waste, ingress/egress.

  3. The CEO may require site plan review if you’re increasing activity, density, or altering the property layout.

  4. Correct any identified deficiencies, submit documentation and updated plans as needed.

  5. After approval, you may apply for a Certificate of Occupancy (COO) for the new residential unit.

  6. Complete building, plumbing, or electrical permits as applicable for any conversion work.

Why It Matters

  • No rental permitted without prior approval: Renting a space that has not been legally converted and approved may lead to violations.

  • Legal risk and penalties: Unpermitted or unsafe units may result in notices to vacate, fines, or revocation of rental privileges.

  • Public safety: Proper review ensures conversion meets life safety, zoning, and structural standards.

Partnering with Town Staff

The Codes & Planning Department ensures all conversions comply with regulatory requirements while upholding Warren’s character and safety standards.

For help navigating the process: