Lot splits are commonly used by landowners who want to sell part of their property, create an additional buildable lot, separate an existing structure from surrounding land, or reconfigure property lines.
Lot split reform can allow for the development of more varied building types, easing costs for homebuyers renters.
Reducing or eliminating minimum lot sizes is a simple way to increase housing densityin already-existing residential zones by requiring less land to construct new homes.
Lot splits can provide income that helps homeownersafford their mortgage, manage everyday expenses, and build long-term wealth, all while providing much-needed housing in their neighborhoods.
When crafting lot split legislation, advocates should carefully consider how the policy will interact with existing zoning frameworks and local political dynamics. Minimum lot sizes are often embedded deeply in local zoning codes and tied to long-standing neighborhood expectations about density and character; reforms can quickly generate concern from homeowners, local officials, and planning departments. Well-designed policy features can help address these concerns while still unlocking meaningful opportunities for additional housing.
Streamlined approval reforms modernize the development review process to reduce unnecessary delays and uncertainty that drive up construction costs. By removing bottlenecks and increasing predictability, these policies lower financing and compliance expenses making it easier to build more housing.
Objective standards create predictability, speed up approvals, lower costs, ensure consistent quality, and help integrate new housing into communities without subjective design delays.
Lowering minimum lot size requirements allows more homes to be built on the same amount of land, increasing overall housing supply and creating opportunities for smaller, more attainable units. By spreading high land costs across more homes and enabling more compact development patterns, this policy helps reduce per-unit prices and makes housing construction more feasible.
Requiring developments to match existing neighborhood design 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.
Occupancy rules add paperwork, reduce rentability, or discourage construction and should be avoided. Landowners should be able to do what they want with their property, regardless of who will eventually live on that new property.
Parking minimums add costs and space requirements that can make some lot splits infeasible, especially on lots where additional parking cannot easily be added.
For lot split policies to achieve their intended impact, enforceability must be a central consideration. Legislation must be designed not only to allow for lot split development, but to ensure that such development can occur predictably, by-right, and at scale. This requires clear standards, meaningful accountability mechanisms and safeguards against common forms of local circumvention. To make this policy enforceable
Reducing barriers to lot splits is a practical way to unlock the full potential of residential land while expanding housing opportunities. By allowing homeowners to divide parcels into smaller, more usable lots, these policies promote efficient land use, increase overall property values, and empower individuals with greater control over their property rights.
A California YIMBY Blog Post: Lot Sizes: When the Bare Minimum is Way Too Much
