“San Diego’s ADU Bonus Program Is Entering a New Era”
San Diego’s ADU Bonus Program helped reshape the conversation around small-scale housing production in California.
For several years, the program became one of the most aggressive local housing incentive systems in the state, allowing developers and property owners to dramatically increase density through deed-restricted affordable ADUs.
But the program is changing.
And after reviewing the City’s 2026 Land Development Code Update materials, public comments, and recent ordinance changes, one thing is becoming increasingly clear:
San Diego is not eliminating the ADU Bonus Program.
It is recalibrating it.
The Original ADU Bonus Program Changed the Development Landscape
The ADU Home Density Bonus Program created opportunities for:
- stacked ADUs,
- multiple detached units,
- fee-simple style housing concepts,
- and substantial density increases on relatively small sites.
In Transit Priority Areas (TPAs), the program became especially powerful because there was effectively no hard cap on total ADU count under the original framework.
The result was a wave of:
- infill housing proposals,
- small-lot multifamily concepts,
- and creative redevelopment strategies throughout San Diego.
The program quickly became one of the most talked-about housing tools in the city.
Why the Program Started Facing Political Pressure
The same flexibility that made the program powerful also generated backlash.
Public concern increasingly focused on:
- infrastructure strain,
- neighborhood scale,
- parking impacts,
- fire safety,
- and projects perceived as “over densifying” single-family neighborhoods.
By 2025, City Council hearings surrounding the program drew thousands of public comments.
That pressure ultimately led to a series of reforms and implementation changes.
What Changed
The City has already introduced several major modifications to the ADU Bonus Program framework, including:
New Unit Caps
The revised program now limits ADU counts in many situations based on lot size:
- up to 4 ADUs on lots under 8,000 SF,
- 5 ADUs on lots between 8,001–10,000 SF,
- and 6 ADUs on larger parcels.
That represents a major shift away from the earlier perception of effectively unlimited density potential in some areas.
Community Enhancement Fees
The City also introduced a new Community Enhancement Fee tied to bonus and affordable ADUs.
The fee is calculated based on the gross floor area of bonus and affordable ADUs.
Importantly:
the City’s current public materials reference the methodology and applicability of the fee, but the exact per-square-foot fee structure appears to still be evolving administratively and through implementation guidance.
However, the broader policy direction is very clear:
the City is attempting to capture infrastructure and community benefit contributions from projects utilizing enhanced density incentives.
Fire Safety and Development Restrictions
The City also added:
- additional fire zone setbacks,
- evacuation access requirements,
- and limitations within certain single-family zones.
These changes reflect growing concern around infrastructure and emergency access in higher-density infill environments.
The Bigger Story: The Program Is Maturing
The most important takeaway is this:
The City is not abandoning the ADU Bonus Program.
It is trying to transition the program from:
“experimental hyper-density tool”
to:
“politically sustainable long-term housing framework.”
That distinction matters.
The City still clearly views ADUs as an important part of:
- housing production,
- infill growth,
- transit-oriented development,
- and affordability strategy.
But the implementation environment is becoming more calibrated and operationally structured.
What Sophisticated Developers Are Watching
Developers are now paying close attention to:
- Transit Priority Area eligibility,
- Community Enhancement Fee exposure,
- lot-size thresholds,
- overlay conditions,
- fire zone restrictions,
- and long-term political durability.
The entitlement strategy around ADU Bonus projects is becoming significantly more nuanced than it was several years ago.
And increasingly, the most successful projects are likely to be:
- strategically scaled,
- operationally efficient,
- infrastructure-conscious,
- and politically durable.
Final Thought
San Diego’s ADU Bonus Program helped redefine what small-scale housing production could look like in California.
But the program is now entering a new phase.
Not elimination.
Not rollback.
Evolution.
And for developers, understanding that transition may become just as important as understanding the density incentives themselves.