California’s Density Bonus Law, codified at Government Code Section 65915, lets a developer build more housing units than local zoning would otherwise allow in exchange for reserving a portion of the project for income-restricted households or building senior housing. The bonus can add up to 50% more units on top of the base density, and it comes bundled with concessions on development standards, waivers of rules that would block the project, and reduced parking requirements. When the statutory requirements are met, the city has to grant it.
Who Qualifies
A project qualifies by committing to reserve a minimum percentage of its base units for one of four categories. You only need to meet one.
- Very low-income households: at least 5% of base units reserved for households earning no more than 50% of area median income.
- Lower-income households: at least 10% of base units reserved for households earning no more than 80% of area median income.
- Moderate-income households: at least 10% of base units in a for-sale (not rental) project reserved for households earning no more than 120% of area median income.
- Senior housing: the entire development qualifies as senior citizen housing, generally for residents aged 62 and older, or 55 and older for projects of 35 or more units.
The affordable set-aside is calculated on the base density before bonus units are added. You set aside a percentage of your original count, then receive bonus units on top without having to make those additional units affordable, though committing more units to affordability unlocks a larger bonus.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
How Many Extra Units You Get
The bonus is a sliding scale. Each qualifying category has its own formula, and the difference between the minimum set-aside and a deeper commitment can double the bonus.
Very Low-Income Track
At the 5% minimum, the bonus is 20%. Each additional 1% of very low-income units adds 2.5 percentage points to the bonus. At 15% very low-income units, the bonus caps at 50%. A 100-unit base project reserving 10 units (10%) for very low-income households earns a 32.5% bonus, bringing the total to roughly 133 units.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
Lower-Income Track
Ten percent lower-income units gets you a 20% bonus. Each additional 1% adds 1.5 percentage points, and the 50% cap is reached at 24% lower-income units. The per-unit reward is smaller than the very low-income track because the affordability commitment is shallower.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
Moderate-Income Track (For-Sale Only)
Moderate-income bonuses start smaller. Ten percent moderate-income units earns just a 5% bonus, and each additional 1% adds one percentage point. The 50% cap is reached only when 44% of units are reserved for moderate-income buyers. This track is generally most useful in larger for-sale developments where the modest per-unit bonus accumulates.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
Beyond 50% and Senior Housing
Projects that go further than the thresholds needed for a 50% bonus can qualify for even greater increases under subdivision (v) of the statute. Los Angeles, for example, recognizes bonuses of up to 88% or 100% for projects that set aside additional very low-income or moderate-income units beyond the standard scale.2City of Los Angeles Planning. Affordable Housing Incentives Guidelines Senior housing developments automatically qualify for a 20% bonus without needing to meet a specific income-restricted unit threshold.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
Concessions, Waivers, and Parking
Extra units on the same lot usually require breaking through height limits, setbacks, or lot coverage rules that would otherwise stop the project. The statute provides three additional tools.
Concessions
A concession is a reduction or modification of a local development standard, such as a taller building, narrower side yards, or reduced open space. The number available scales with the affordability commitment: projects at the minimum thresholds get one, and deeper commitments unlock two or three. A city can deny a concession only by making specific written findings that it would cause a specific, adverse public health or safety impact, or that it would conflict with state or federal law. The burden of proving harm sits with the city.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
Waivers
Waivers go further. If a specific development standard would physically prevent the project from being built at the bonus density, the developer can ask for the standard to be waived or reduced entirely. There is no cap on the number of waivers, which is particularly useful on tight urban infill sites. Denials again require specific findings of public health or safety harm.3California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
Parking
The statute sets maximum parking ratios that a city cannot exceed for density bonus projects, regardless of what the local parking ordinance requires. These caps are often well below standard municipal requirements, which can save substantial construction costs where structured or underground parking would otherwise be needed.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives
What You Commit to in Return
The bonus is not free. The developer signs an affordability covenant restricting rents or sale prices on the qualifying units. Rental projects typically carry a 55-year restriction; for-sale projects generally carry 45 years. The covenants run with the land, so they bind future owners, not just the original developer.
During the covenant period, restricted units must stay affordable to the income group they were designated for. Rents on low-income and very low-income units are tied to area median income figures published annually by the California Department of Housing and Community Development. Failure to maintain compliance risks enforcement, including potential clawback of the benefits received under the bonus.
How to Apply
The application goes through the local planning department along with the standard development application. It should specify the number and type of affordable units, which qualifying category is being used, and which incentives, concessions, waivers, or parking reductions are being requested. Enough project detail should be included for planners to evaluate whether the requested concessions or waivers are actually needed to build at the proposed density.
The density bonus is not discretionary. When the project meets the statutory requirements, the city “shall grant” the bonus.1California Legislative Information. California Code GOV 65915 – Density Bonuses and Other Incentives Neighbor opposition or a planning commission’s preference for a smaller project is not a lawful basis for denial. The same mandatory framing applies to concessions and waivers, though the city has slightly more room to push back on those through specific written findings of harm.
Engaging planning staff early, before the formal application, tends to move things faster. A clear breakdown of which statutory provisions apply, and how the affordable set-aside meets the qualifying threshold, reduces the chance of an uninformed denial.
When Cities Push Back
Most litigation under the law turns on one question: can a city add conditions or withhold benefits the statute says the developer is entitled to? Courts have consistently sided with developers who meet the requirements.
In Bankers Hill 150 v. GP II LLC, the California Court of Appeal confirmed that when a developer meets the law’s requirements, the local government is obligated to permit the increased density, grant the incentives, and waive conflicting development standards unless narrow exceptions apply. The developer there successfully used the law to avoid a setback requirement and eliminate on-site loading space requirements that would have cut the project’s unit count.4FindLaw. Bankers Hill 150 v. GP II LLC
Other disputes have involved how the law interacts with coastal zone regulations. Kalnel Gardens, LLC v. City of Los Angeles raised concerns that the density bonus might not apply in coastal areas, prompting legislative action to clarify that it does.5Assembly Committee on Housing and Community Development. AB 2797 – Assembly Committee on Housing and Community Development Analysis Narrow court rulings followed by legislative fixes have shaped the statute over the past decade.
The law is strong, but using it sometimes takes willingness to push back. Cities that impose conditions the statute doesn’t authorize, or that deny concessions without the required written findings, are open to legal challenge, and a carefully documented application record is what makes that challenge straightforward when it becomes necessary.