Reducing Minimum Lot Sizes

What are Minimum Lot Sizes?

Smaller lot size requirements facilitate the construction of more homes within a single parcel of land. By lowering the square footage or acreage required for each individual home, cities can increase density by allowing more units on existing lots or increasing the number of proposed homes allowed in new construction areas.

The Impact of Minimum Lot Size

Lot reformcan allow for the development of more varied building types, easing costs for homebuyers renters.

Across the country, local jurisdictions’ requirementsfor minimum lot sizes have been on the rise since 2006. In a survey of over 2,000 cities and towns, the responses indicated that many municipalities have minimum lot sizes of between half to one acre. Both local and state governments have had success in increasing housing densities by reducing or eliminating minimum lot sizes.

Crafting Minimum Lot Size Reduction Policy

When crafting minimum lot size reduction legislation, advocates should aim to maximize the amount of land available for new housing while ensuring the policy is clear, enforceable, and resilient to local resistance. Strong legislation should not only lower or eliminate minimum lot size requirements, but also ensure that these changes translate into real, on-the-ground housing production.

Policy Features to Aim For

Legislation should include clearly defined minimums to prevent excessively restrictive standards that undermine housing affordability. When set too high, minimum lot size requirements force buyers to purchase more land than necessary, raising housing costs and limiting access. A successful policy will reduce lot requirements to the smallest size possible. Even better, keep in mind that a minimum lot size can be “no minimum” at all.

Example Legislation
Example Language: “Lot area: No minimum"

Vague definitions of lot size can hurt more than help, as they open opportunities for discretion in the local housing approval process. Be as specific as possible when defining local lot sizes, or eliminate them entirely.

Example Legislation
Example Language: “reduces minimum lot size requirements for two-family dwellings from 2,500 square feet per unit to 1,250 square feet per unit in district "B".

Policy Features to Avoid

Requiring developments to match existing neighborhood design, size, or materials may unnecessarily restrict or prevent housing production.

Setback and floor area ratio requirements that exceed what is necessary for health and safety may significantly constrain buildable area and prevent housing from being developed.

Maximum lot size requirements are another zoning barrier that limits housing supply, drives up costs, promotes sprawl, and reinforces economic and racial segregation.

Implementation Guidance

Any new law must include clear standards and penalties, including consequences for failing to adopt a reduction in lot sizes or for blocking compliant projects. Examples include a fine equal to 30 percent of the final sale price of the land sold or developed in violation of this Act for a first violation.
Implementation of this policy should rely on ministerial approval to ensure compliance. Reducing minimum lot sizes must be applied without discretionary review, preventing projects from being denied based on subjective standards.

Common Political Dynamics Around Reducing Minimum Lot Sizes

When advocates push to reduce minimum lot sizes, one of the most common concerns is neighborhood character. Opponents often argue that smaller lots will lead to overcrowding, loss of open space, or a shift away from the existing built environment.

Minimum lot sizes allow for greater housing variety, which helps alleviate the housing crisis.
This policy allows for much needed missing middle housing. Small-scale housing such as ADUs and small multiunit buildings like duplexes and four-plexes are referred to as “missing” because they have largely been illegal to build in most neighborhoods throughout the United States due to local zoning restrictions
Policymakers looking to enhance affordability while addressing climate pollution should consider reducing or eliminating minimum lot sizes.

Urbanists like Strong Towns
Environmentalists like Sierra Club
Missing middle coalition groups like Missing Middle Housing
Homebuilder Associations
Affordable housing developers
Community land banks
National Zoning Atlas

Lot Sizes: YIMBYs in the News

Colorado

Colorado YIMBYs are actively advocating for a lot size reform bill as it moves through the legislative process. The bill has passed the House and is now headed to the Senate.

Texas

Dallas Neighbors for Housing helped pass a 2025 bill to reduce minimum lot sizes statewide in Texas

Wisconsin

Madison is for People advocated their city’s Summer 2025 Housing Forward Proposals, which included a lot size reform. It allowed single lots to be split into a primary and backyard lot for home construction.

Resources about Reducing Minimum Lot Sizes

Mercatus Center provides the history of minimum lot sizes and the effects on housing.
Meractus Center also takes a look at lot size regulations in Texas.
The National Bureau of Economic Research designed an experiment comparing two cities and their minimum lot restrictions.
Lot Sizes: When the Bare Minimum is Way Too Much - California YIMBY
National Zoning Atlas highlights zoning and land use data across the United States

Reducing Minimum Lot Sizes

Minimum lot size is the smallest allowable area for a development parcel within a specific zoning district