Land records · Parcel maps · October 7, 2026
What Is a Density Bonus in Zoning?
What is a density bonus? An incentive letting developers build more units or floor area than zoning allows in exchange for affordable housing or amenities.
What is a density bonus? A density bonus is a zoning incentive that allows a developer to build more housing units, more floor area, or a taller building than the base zoning normally permits, in exchange for providing a public benefit. The most common benefit is affordable housing, but bonuses may also be offered for open space, public plazas, green building, historic preservation, or contributions to a fund. Density bonuses help cities encourage desired outcomes without spending public money directly. Many states and cities have formal programs. This page is general land-records background, not legal advice.
How density bonuses work
- Base zoning sets maximum density, such as units per acre or floor area ratio.
- Developer offers a qualifying benefit.
- Code grants extra density according to a formula.
- Agreements or covenants secure the benefit, often recorded.
Common benefits that earn bonuses
| Benefit | Example bonus |
|---|---|
| Affordable housing | Extra units based on the share of affordable units |
| Public open space | Additional floor area |
| Historic preservation | Extra density on another site |
| Green building | Added height or floor area |
| Transit proximity | Higher density near stations |
State density bonus laws
Some states require local governments to grant density bonuses for qualifying affordable housing. California’s density bonus law is a well-known example, granting bonuses and concessions on a sliding scale based on the percentage of affordable units.
Concessions and waivers
Programs often include concessions, such as reduced parking or setbacks, so the extra units can fit. Waivers of development standards may be allowed when standards would physically prevent the bonus.
Density bonus vs inclusionary zoning
Inclusionary zoning may require affordable units, while density bonuses reward them. Some programs combine both, offering bonuses to offset mandatory requirements.
Relationship to TDR
Transfer of development rights lets density move from one site to another. A receiving site may get a density bonus by buying development rights from a preserved site.
Recorded agreements
Affordable units or public amenities tied to a bonus are usually secured by recorded covenants or agreements, which appear in title searches. Buyers of affected units should review them.
Example
Base zoning allows 50 units on a site. The developer agrees to make 10 percent of units affordable to low-income households and receives a 25 percent density bonus, allowing 62 units, plus a parking reduction.
Neighborhood concerns
Neighbors sometimes oppose bonus projects because of height, traffic, or parking. State laws may limit local discretion to deny qualifying projects. Projects may also be processed through a PUD.
Finding bonus rules
Look in the zoning code for sections on incentives, bonuses, or affordable housing. Planning staff can explain eligibility.
Checking for bonus units
If you buy or rent in a building that received a bonus, ask which units are restricted.
Bottom line
A density bonus lets developers exceed base zoning density in exchange for public benefits like affordable housing or open space, often with concessions and recorded agreements. Rules vary by state and city. Check the zoning code and title records for related covenants. Explore zoning via the Platbookmapper map.
What is a density bonus FAQ
What is a density bonus?
Extra development allowed in exchange for public benefits.
What qualifies for a density bonus?
Often affordable housing, open space, or green building.
Are density bonuses guaranteed?
Some state laws require them for qualifying projects.
What is a concession?
A relaxed standard, such as reduced parking, tied to a bonus.
Are density bonus agreements recorded?
Usually, as covenants or agreements.