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Converting a Single Family to a Duplex

At-a-glance

Is a ...	Required?
Permit	Yes
Contractor	No*
Zoning Check and Site Plan	Yes
Inspection	Yes
Construction Plan Review	Yes

Homeowners can perform work on their own properties without a contractor

Before You Start

Look at these pages:

Requirements for Additions and Alterations (PDF)

Minimum Standards for Dwellings (PDF)

Interior Remodeling or Alterations

Exterior Remodeling or Alterations

Finding a licensed contractor

Hiring a Residential Contractor – what do I need to know? (PDF)

Site Plan

Zoning Approval

About Conversions

Conversions or Alterations of Single-Family Dwelling to Duplex (PDF)

Duties of landlords and tenants

About Permits

Applying for a Permit

Permits Overview

Timeline for Completion

About the Inspections Process

Site Plan

Inspections Process

Forms and Handouts for Conversions

Building / Street Use Application for a permit (PDF)

Electrical / Electric Heat Application for a permit (PDF)

Building Code Requirements for Area Separation Walls, January 1988

Procedure for Obtaining a Certificate of Occupancy for a New Building or Change of Use, Nov. 2003

Rafter Span Tables

Roofing Handout for One-family and Two-family Dwellings, April 1, 2003