San Diego (neighborhood) · Updated April 2026
La Jolla ADU Cost Guide: $280K–$500K in 2026
San Diego's premium coastal market — higher costs, higher rental returns.
Quick Answer
La Jolla ADUs: $280K–$500K
Permits: $5K–$15K · Updated April 2026
ADU Costs in La Jolla: Overview
La Jolla is one of San Diego's most affluent coastal neighborhoods, and ADU construction here reflects that premium. Costs run 30–50% above inland San Diego due to three factors: Coastal Commission oversight for properties in the coastal zone, higher contractor rates driven by the area's premium standards, and the expectation of upscale finishes that match La Jolla's housing stock. Despite the higher costs, La Jolla ADU rental income is among the highest in San Diego County — a well-finished 1-bed ADU can command $2,800–$4,500/month.
Cost by ADU Type
| ADU Type | Cost Range | Best For |
|---|---|---|
| Detached ADU | $300K–$500K | Maximum privacy, highest rental income |
| Attached ADU | $200K–$350K | Lower cost, shared wall with main home |
| Garage Conversion | $130K–$250K | Most affordable, uses existing structure |
| JADU (under 500 sq ft) | $70K–$130K | Lowest cost, within existing home |
| Above-Garage ADU | $280K–$450K | Preserves yard space, adds second story |
Per square foot costs in La Jolla: $350–$600. Updated April 2026.
What Drives ADU Costs in La Jolla?
The California Coastal Commission adds both time and cost to La Jolla ADU projects. Properties within the coastal zone (generally west of La Jolla Village Drive and Torrey Pines Road) may require a Coastal Development Permit in addition to standard building permits, adding $3,000–$8,000 in fees and 2–4 months to the timeline. Salt air exposure requires marine-grade materials for exterior components, adding 5–10% to material costs. Many La Jolla lots have complex topography requiring engineered foundations and retaining walls ($15K–$40K additional).
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La Jolla Shores
Coastal zone — Coastal Commission review likely required. Premium rental market ($3,500–$4,500/mo for ADUs). Detached ADUs: $350K–$500K.
Bird Rock
Village-adjacent with walkability premium. Smaller lots may limit to attached ADUs or JADUs. Strong short-term rental potential.
La Jolla Village
Commercial proximity drives rental demand. Mixed lot sizes. Typical ADU: $300K–$450K.
University City (UTC)
Near UCSD. Technically not La Jolla proper but adjacent. More affordable ($250K–$380K) with strong student/researcher rental demand.
Frequently Asked Questions
How much does an ADU cost in La Jolla?
ADU costs in La Jolla range from $280,000 to $500,000 for a detached unit — 30–50% above inland San Diego. The premium comes from Coastal Commission requirements, marine-grade materials, premium finishes, and higher contractor rates. Per square foot costs are $350–$600.
Do I need a Coastal Development Permit for a La Jolla ADU?
Potentially. Properties within the California Coastal Zone (generally west of La Jolla Village Drive) may need a Coastal Development Permit from the California Coastal Commission. This adds $3,000–$8,000 in fees and 2–4 months to the timeline. Properties outside the coastal zone follow standard San Diego ADU permitting.
What can I rent a La Jolla ADU for?
La Jolla ADU rental rates are among the highest in San Diego County. A well-finished 1-bedroom ADU (400–600 sq ft) can command $2,800–$4,500 per month depending on proximity to the coast, finishes, and whether parking is included.
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