San Diego County · Updated April 2026
Chula Vista ADU Cost Guide: $180K–$350K in 2026
South Bay San Diego's fastest-growing city for ADU construction.
Quick Answer
Chula Vista ADUs: $180K–$350K
Permits: $3K–$10K · Updated April 2026
ADU Costs in Chula Vista: Overview
Chula Vista is the second-largest city in San Diego County and one of the fastest-growing ADU markets in the South Bay. With lot sizes generally larger than coastal San Diego neighborhoods, Chula Vista offers more flexibility for detached ADU placement. The city follows California state ADU law (AB 68, SB 13) and processes permits through its own Development Services Department, typically within 60 days for by-right projects.
Cost by ADU Type
| ADU Type | Cost Range | Best For |
|---|---|---|
| Detached ADU | $200K–$350K | Maximum privacy, highest rental income |
| Attached ADU | $130K–$240K | Lower cost, shared wall with main home |
| Garage Conversion | $80K–$170K | Most affordable, uses existing structure |
| JADU (under 500 sq ft) | $50K–$95K | Lowest cost, within existing home |
| Above-Garage ADU | $180K–$320K | Preserves yard space, adds second story |
Per square foot costs in Chula Vista: $220–$420. Updated April 2026.
What Drives ADU Costs in Chula Vista?
Chula Vista's ADU costs run 5–15% below core San Diego due to lower land preparation costs and more straightforward permitting. However, properties in eastern Chula Vista near the Otay Ranch master plan may face HOA restrictions that require additional review. The city's warmer inland climate means HVAC costs are a priority — budget $8,000–$15,000 for a quality mini-split system. Sewer connection fees in Chula Vista range from $4,000–$8,000 depending on ADU size.
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Get Your EstimateNeighborhood Cost Breakdown
Eastlake
Master-planned community with larger lots ideal for detached ADUs. HOA review may be required but cannot prohibit ADUs under state law. Costs tend toward the higher end ($300K+) due to higher finishes matching the neighborhood.
Otay Ranch
Newer construction with modern infrastructure. Utility connections are simpler but HOA architectural review is common. Typical detached ADU: $220K–$320K.
Southwest Chula Vista
Older homes with established lots. Great candidates for garage conversions ($80K–$150K). Closer to the border with potentially lower contractor rates.
Bonita (unincorporated)
Technically San Diego County jurisdiction, not City of Chula Vista. County permits may differ. Larger rural lots offer maximum ADU flexibility.
Frequently Asked Questions
How much does an ADU cost in Chula Vista?
ADU costs in Chula Vista range from $180,000 to $350,000 for a detached unit. Garage conversions start around $80,000, and JADUs (under 500 sq ft within the existing home) run $50,000–$95,000. Per square foot costs are $220–$420.
Does Chula Vista allow ADUs?
Yes. Chula Vista follows California state ADU law, which requires cities to allow ADUs by right on any residential lot. The city's Development Services Department processes ADU permits, typically within 60 days for projects meeting objective standards.
What are Chula Vista ADU permit fees?
Permit fees in Chula Vista range from $3,000 to $10,000 depending on ADU size and type. Impact fees are waived for ADUs under 750 sq ft per California law. Plan check and building permit fees are the largest components.
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