Parking mandates
Based on Wikipedia: Parking mandates
In 1923, the city of Columbus, Ohio, passed a zoning ordinance that would eventually reshape the physical and economic landscape of the entire North American continent. It was not a law about housing affordability, nor was it a directive on public transit infrastructure or urban density. It was a mandate requiring new developments to provide a specific number of off-street parking spaces. This seemingly bureaucratic footnote in municipal code became the invisible architect of the modern suburbs, dictating where people could live, how much their rent would cost, and why American cities look the way they do. Today, as we navigate a housing crisis of historic proportions, understanding the mechanics of these parking mandates is not merely an exercise in urban planning history; it is an investigation into a policy that has silently subsidized car culture at the expense of human shelter.
Parking mandates, often referred to as parking requirements or minimums, are policy decisions enacted by municipal governments that compel developers to construct a predetermined number of parking spots for every new building. These rules vary wildly depending on the intended use of the structure. A typical apartment complex might be required to provide one space for every unit. A restaurant might need a spot for every 100 square feet of dining area. A church must build two spots for every five seats in its pews, and a hospital must provide two spaces for every bed. The logic, first popularized in the United States during the post-war construction boom of the 1950s, was ostensibly to prevent street parking from becoming overcrowded. The fear was that without government intervention, developers would build too few spaces, leading to chaos on public thoroughfares.
However, the reality of these mandates has diverged sharply from their original intent. By forcing developers to build a fixed number of spaces regardless of actual market demand, these policies have created a massive oversupply of parking. This oversupply functions as an implicit subsidy to drivers, making parking appear more abundant and cheaper than it would be in a free market. But the subsidy comes with a hidden price tag, one that is rarely visible on a monthly rent check or a grocery bill. The cost of building these mandated spaces is shifted from the drivers who use them to the developers who must build them, and ultimately, to the tenants and customers who must pay for them.
The financial mathematics of this shift are staggering. Constructing a single non-garage parking spot costs an average of $28,000. If that spot is tucked into an underground garage, the price jumps to approximately $56,000, and this figure excludes the cost of the land itself. When a developer is legally required to include these spaces, they cannot simply pass the cost to the driver who parks; they must bake it into the price of the building. Studies suggest that these hidden costs increase the price of rents by nearly 20 percent. In a market where housing is already becoming unaffordable for millions, parking mandates act as a tax on housing itself, forcing families to pay for empty asphalt they may never use.
"Parking minimums are a pseudoscience."
This blunt assessment comes from Donald Shoup, a UCLA urban planning professor who pioneered the field of parking research. Shoup argues that the data used to create these mandates is fundamentally flawed. The standard for setting parking requirements in North America relies heavily on a guidebook published by the Institute of Transportation Engineers (ITE) known as Parking Generation. Updated every five years, this handbook provides statistical data derived from observational studies of various land uses. Planners look at how many cars are parked at a specific type of business—say, a bowling alley or a church—at peak times and use that number to set a minimum requirement for all similar buildings.
The problem, as Shoup and others have pointed out, is that this methodology is based on questionable statistical validity. The ITE studies often rely on minimal data sets and approximations that cannot be widely applied. More critically, the studies measure parking demand when parking is free and abundant. They do not account for the price of parking. When parking is free, demand is artificially high because there is no cost to discourage unnecessary trips or carpooling. By observing a site where parking is underpriced and oversupplied, the ITE calculates an inflated generation rate. This number is then codified into law, requiring new buildings to match the worst-case, peak-time scenario of a specific site, regardless of whether that scenario is realistic for a new development in a different location.
The consequences of this "pseudoscience" are visible in the absurd requirements imposed on businesses. Before San Jose, California, eliminated its parking minimums in 2022, the city required bowling alleys to provide seven parking spots for every single lane. This calculation assumed that every lane would be occupied by a full party, and that every member of that party would arrive in a separate car. For the broad category of "Recreation, commercial (indoor)," the city mandated one spot for every 80 square feet of recreational area, completely ignoring the actual number of users arriving by car. A restaurant was forced to build a parking lot eight times the size of the dining area itself. These are not efficient uses of space; they are bureaucratic fantasies that force cities to pave over potential housing with concrete that often sits empty.
The impact of these mandates extends far beyond the parking lot. They have fundamentally altered the urban form of North America. By requiring a certain amount of land to be dedicated to parking, the mandates lower the density of development. If a developer must leave 40% of their land for parking, they cannot build as many apartments or as much office space. This reduction in density has contributed directly to the suburbanization of the post-war era, pushing the middle class away from urban centers into single-family detached homes. The result is a landscape characterized by wide streets, vast expanses of asphalt, and a severe lack of walkability. Cities designed around these mandates favor the automobile over the pedestrian, making it difficult for anyone without a car to access jobs, services, or social life.
Furthermore, parking minimums fail to accomplish their primary stated purpose: eliminating curb congestion. The logic suggests that if everyone has a guaranteed spot off the street, traffic will flow smoothly. But as long as cities offer curb spaces for free, drivers will always prefer to park on the street rather than in a paid garage. This creates a paradox where off-street parking lots sit half-empty while drivers circle blocks for hours, burning fuel and creating traffic jams, searching for a free spot. A 2012 study found that on weekdays and during weekend special events, downtown garages were 20 percent vacant. The problem is not a lack of supply; it is the mispricing of the curb. By mandating off-street spaces, cities have created a glut of parking that does nothing to solve the congestion caused by the search for free street parking.
The human cost of this policy is measured in dollars and in opportunities lost. The cost of a parking space is not just a line item on a developer's balance sheet; it is a barrier to entry for low-income families. When the cost of construction is inflated by the requirement to build expensive parking structures, the resulting rents are higher. This has contributed significantly to America's housing affordability crisis. In cities with strict parking mandates, the cost of a new apartment includes the cost of a parking space that the tenant may not own a car, or may not need. This forces the entire population to subsidize car ownership, even for those who choose to walk, bike, or take transit.
Recognizing these failures, a quiet revolution has begun. Since 2017, many U.S. cities have started to overhaul or entirely repeal their parking minimum laws. The shift is not just theoretical; it is producing measurable results. The average number of parking spots per new residential unit, which peaked at 1.7 in 1998, has declined to 1.1 by 2022. Similarly, the average number of spots per 1,000 square feet of new office space has dropped from 3.75 in 1999 to 2.25 in 2022. In some jurisdictions, the mandates have been replaced with parking maximums, which limit the amount of parking a developer can build to encourage the use of transit and reduce the carbon footprint of new developments.
San Jose, California, serves as a prime example of this transition. By eliminating the mandates that once required bowling alleys to build seven spots per lane, the city has opened the door for more flexible, efficient development. The move acknowledges that the one-size-fits-all approach of the mid-20th century does not work in a 21st-century urban environment. The data suggests that when parking minimums are reduced or eliminated, housing supply increases substantially. This is a critical realization for a nation grappling with a shortage of affordable homes.
The history of parking mandates is a history of unintended consequences. What began as a well-intentioned effort to keep streets clear has evolved into a system that distorts the market, inflates housing costs, and carves up cities into sprawling, low-density zones. The pseudoscience of the ITE Parking Generation rates, combined with the rigid enforcement of minimums, has created a built environment that is inefficient, expensive, and often hostile to the very people it was meant to serve.
As cities look to the future, the path forward requires a rejection of the old assumptions. It demands a recognition that parking is not a right to be mandated, but a resource to be managed. It requires understanding that the cost of parking is not zero, and that shifting that cost to developers and then to tenants is a regressive policy that hurts the poor most of all. The trend toward eliminating these mandates is a step toward a more equitable and efficient urban future, one where housing is affordable, streets are walkable, and the city is designed for people, not just cars.
The story of parking mandates is also a story about the power of zoning to shape society. The decisions made in city councils in the 1950s and 60s continue to echo in the empty lots of today. They determine who can afford to live in the city, how people move through their daily lives, and the environmental impact of our built environment. As more cities join the movement to repeal these outdated rules, there is hope that the concrete jungles of the past can be transformed into vibrant, dense, and affordable communities for the future. The first step is to stop building parking lots we don't need and start building homes we do.
The transition is not without its challenges. Changing decades of zoning precedent requires political will and a willingness to confront entrenched interests. Developers who have built their business models around these mandates may resist. Planners accustomed to using the ITE handbook may find the shift to market-based analysis difficult. But the evidence is clear: the old system is broken. It has produced a housing crisis, a traffic crisis, and an environmental crisis. The solution lies in the quiet, unglamorous work of rewriting zoning codes, removing the mandates that force us to pave over our future, and allowing cities to breathe again.
In the end, the question is not whether we can afford to build parking. The question is whether we can afford not to. Every square foot of land dedicated to an empty parking space is a square foot that could have been a home, a park, or a community center. The cost of parking mandates is not just in the dollars spent on construction; it is in the opportunities lost, the communities fragmented, and the families priced out of the cities they call home. As we move forward, the goal must be to create cities that work for everyone, not just those who drive. The repeal of parking minimums is a vital step in that direction, a recognition that the car is not the center of our lives, and that our cities should reflect that reality.
The data from the past decade offers a glimmer of hope. As cities like San Jose, Los Angeles, and others begin to dismantle these requirements, we are seeing the beginning of a new era in urban planning. The decline in the average number of parking spots per unit is a signal that the tide is turning. The rigid, arbitrary rules of the past are giving way to a more flexible, data-driven approach that prioritizes human needs over car storage. It is a reminder that policy matters, that the decisions we make in the present shape the world of the future, and that sometimes, the most profound changes come from simply removing the rules that hold us back.
The journey to a more livable city begins with a single decision: to stop mandating parking. It is a decision that requires courage, vision, and a commitment to the common good. As we look at the empty lots and the struggling housing markets of today, we must remember that the solution is not to build more parking, but to build more homes. The parking mandates of the 20th century have done their damage. It is time to undo them, to reclaim our cities, and to build a future where everyone has a place to live, and where the streets are for people, not just cars.