Inclusionary Zoning (IZ) is a program put in place to produce affordable inclusionary units for households making 80% or less of the area median income (AMI). An inclusionary unit is a dwelling unit set aside for sale or rental to a targeted household as required by Subtitle C, Chapter 10.

The purposes of the Inclusionary Zoning (IZ) Program are:

  • To further the Housing Element of the Comprehensive Plan by increasing the amount and expanding the geographic distribution of adequate, affordable housing available to current and future residents;
  • To utilize the skills and abilities of private developers to produce quality affordable housing;
  • To leverage private development, combined where appropriate with zoning density increases, to produce affordable housing throughout the District;
  • To mitigate the impact of market-rate residential development on the availability and cost of housing available and affordable to low- and moderate-income households;
  • To increase the production of affordable housing units throughout the District to meet existing and anticipated housing and employment needs;
  • To provide for a full range of housing choices throughout the District for households of all incomes, sizes, and age ranges to preserve diversity and to ensure the benefits of economic integration for the residents of the District;
  • To stabilize the overall burden of housing costs on low- and moderate-income households;
  • To create a stock of housing that will be affordable to low- and moderate-income residents over a long term; and
  • To make homeownership opportunities available to low- and moderate-income residents.

Zones Subject to IZ Requirements. Click here for more information.

It is the intent of the Zoning Commission to promulgate only such regulations as are necessary to establish the minimum obligations of property owners applying for building permits or certificates of occupancy under an IZ Program. All other aspects of the program, including the setting of maximum purchase prices and rents, the minimum sizes of the units, the selection and obligations of eligible households, and the establishment of enforcement mechanisms such as covenants and certifications shall be governed by the following laws and regulations related to the IZ requirements:

  • The Inclusionary Zoning Implementation Amendment Act of 2006; and

Types of Inclusionary Developments

There are two categories of Inclusionary Developments: Mandatory Inclusionary Developments (Subtitle C, section 1001.2(a)), and Voluntary Inclusionary Developments (Subtitle C, section 1001.2(b)).

IZ Plus (IZ+) Inclusionary Developments – are a type of mandatory inclusionary development located on property that was the subject of a map amendment that increased the allowable FAR pursuant to Subtitle X § 502, and as indicated with an “IZ+” on the Zoning Map and that meets one of the categories of subparagraphs (1) through (2) of paragraph 1001.2(a).

The intent of the IZ+ designation is to require an increased amount of affordable housing in areas where the permitted density of property is increased through the map amendment process.


For more information on the following topics, please see the corresponding referenced sections: