Can zoning be the answer to solving housing shortages and increasing affordability?  Many city planners and politicians think so.  Although many localities are still considering upzoning ordinances, some have already implemented upzoning amendments that allow increased resident density.  The immediate effect is likely to be felt by the addition of housing.  However, it’s unclear how and if the additional units will relieve housing prices.  Opponents voiced concern over potential long-term effects of upzoning in single-family neighborhoods.

Research conducted by G. Donald Jud in 1980 suggests that the absence of zoning (or loose zoning) decreases property value (The Effects of Zoning on Single-Family Residential Property Values: Charlotte, North Carolina; Land Economics; Vol. 56, No. 2, p. 142-154).  His study concludes that residential property owners pay a premium for uniformly in land use.  Jud writes “One of the principal purposes of municipal zoning ordinances is to protect property owners from the deleterious external effects that may arise when incompatible land uses exist within the same neighborhood.”  However, he also states that in the absence of zoning protection, other mechanisms are created, such as neighborhood covenants (e.g. HOA, or civic association).

Herbert S. Swan wrote in 1949 (Economic and Social Aspects of Zoning and City Planning; The American Journal of Economics and Sociology; Vol. 9, No.1, p.45-56) that efficient city planning and zoning ordinances can only be measured by their adaption to current conditions.  He stated, “Only as they meet basic requirements of present population, and the emerging needs of prospective population, can they be said to serve a community in full measure.”

Swan’s words ring true today, as local governments look to zoning to address housing shortages and affordability.  “Upzoning” is the current trend to “meet the emerging needs of the population” to alleviate housing issues.  The city of Minneapolis and state of Oregon have already implemented new zoning that essentially eliminates single-family land use in turn for increased density.  And the trend is spreading throughout the country.  While some localities have gone to the extreme to essential ban single-family development, others are loosening zoning to allow auxiliary dwelling units (ADU).  The Virginia legislature is currently considering statewide upzoning legislation.

Earlier this year, the Montgomery County Council loosened zoning requirements for ADUs.  Zoning Text Amendment 19-01 became effective Dec. 31, 2019.  The passed amendment has additional background information, including a brief description of opposition views from residents.  Some of the concerns of increased density in single-family neighborhoods included overcrowding in schools and decreased availability of parking. Additionally, there is concern that car-choked streets could impede emergency vehicles.  Environmental concerns included uncontrolled water runoff from increased number and size of ADUs.  Opponents to the amendment also voiced concern with “the inability of the County to enforce any regulations.”

Montgomery County’s “loosened” zoning amendment is meant to increase density in single-family zoned neighborhoods.  In light of resident concerns, the Council allowed direct input from the Montgomery County Planning Board to increase the supply of accessory dwelling units in the county, “while also working to minimize any negative impacts on residential neighborhoods.”

Dan Krell is a Realtor® with RE/MAX Platinum Realty in Bethesda, MD. You can access more information at

(0) comments

Welcome to the discussion.

Keep it Clean. Please avoid obscene, vulgar, lewd, racist or sexually-oriented language.
Don't Threaten. Threats of harming another person will not be tolerated.
Be Truthful. Don't knowingly lie about anyone or anything.
Be Nice. No racism, sexism or any sort of -ism that is degrading to another person.
Be Proactive. Use the 'Report' link on each comment to let us know of abusive posts.
Share with Us. We'd love to hear eyewitness accounts, the history behind an article.