Can I Build an ADU in San Diego?
Data version: Q2 2026 · Last updated 2026-05-13
Buildability City Score™: B (Middle 45%) · Median permit time: 90 days
TL;DR. Thinking about an ADU on your San Diego, California lot? Buildability™ reads San Diego's ADU ordinance against your exact parcel — zoning, setbacks, height, parking, owner-occupancy — and returns a Buildability Score™ in 20 seconds. First check is free.
San Diego ADU rules at a glance
San Diego follows local ordinances layered on top of California state ADU law. Typical restrictions cover maximum size (often 800–1,200 sqft), height (16–25 feet), side setbacks (4 feet minimum in most jurisdictions), parking (often waived near transit), and owner-occupancy. With a median home value around $900K in San Diego, adding a compliant ADU can substantially increase property value and generate rental income. Buildability™ reads San Diego's specific code against your exact lot.
Why this matters
A compliant ADU on a San Diego lot can add $150K–$500K in value depending on size and neighborhood. Roughly one in four lots has a dealbreaker — easement, overlay, setback encroachment — that isn't visible from the street. Check before you spend.
How Buildability™ checks your San Diego property
Enter any San Diego address. Buildability™ pulls zoning, lot dimensions, easements, environmental overlays, utility access, and current California state ADU law. Results include your Buildability Score™, setback envelope, maximum ADU size, parking waiver eligibility, and an estimated permit timeline — in about 20 seconds. Free for your first check.
Help us keep this accurate
Buildability™ translates San Diego's ADU rules in plain language. Rules change and overlays are sometimes missed — if you spot an error on this page, email team@buildability.us with the URL and what's off. We verify with the San Diego planning department and update within 48 hours of a confirmed correction. San Diego planning staff: the same email works if you'd like to flag corrections or set up a direct verification channel.
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