Zoning for Accessory Dwelling Units

by Amy Dain, for Pioneer Institute of Public Policy Research and Smart Growth Alliance, July 2018 (This study updates a 2004-06 study on ADUs by the Pioneer Institute.)

Even in the midst of a housing crisis, zoning laws prohibit most homeowners in cities and towns around Boston from adding accessory dwelling units (ADUs) to their single family houses. An ADU is an apartment within or behind an own- er-occupied single family house that appears from the street to be a single-family as opposed to a two-family house.

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The State of Zoning for Multi-Family Housing in Greater Boston

(published June, 2019)

Overview

To solve the extraordinarily large deficit in housing for the greater Boston region, over 180,000 units of new housing should come on line in the next few years. This deficit is the result of a rapid expansion in in-migration due to new job creation, with no commensurate increase in housing production for the people taking those new jobs.

The report concludes that zoning is a primary culprit in restricting the development of an adequate housing supply, creating a “PAPER WALL” keeping out newcomers. The cost of this inadequate supply is a huge demand for housing which, in turn, bids up the price for available housing. The following “culprits” are considered: inadequate land area zoned for multi-family housing; low density zoning; age restrictions and bedroom restrictions; excessive parking requirements; mixed use requirements and approval processes. Alternative zoning models are suggested.

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