ADU Permitting in San Diego: What’s Changing and What’s Working
Smaller footprints, smarter conversions, and incentive-driven planning to reduce fees and shorten approvals.
San Diego ADU activity continues to favor high-efficiency layouts and conversion-based projects (garage conversions, additions, compact detached units) because they typically reduce site work and shorten field timelines. Another consistent pattern is designing near (or under) 750 sq ft when the program allows, since California guidance confirms ADUs under 750 sq ft are exempt from local impact fees, which can materially improve feasibility.
On the “incentives” side, San Diego’s ADU Bonus Program remains a key lever for owners/developers who can provide affordability: the City describes a bonus structure that allows additional ADUs in exchange for deed-restricted affordable ADUs (15 years), with stronger bonus potential in Transit Priority Areas (TPAs). This is a strategic driver behind multi-ADU site planning and “stacked” approvals approaches where the parcel and zoning support it.
For permitting expectations, the City’s Development Services Department publishes a weekly permit processing timeline snapshot (application setup, review, issuance), which is useful for setting realistic pre-con schedules and avoiding rushed submittals. If time is the constraint, the City also offers an optional Expedite Program for qualified projects, which can change how teams plan submittal completeness and consultant coordination.
