ADU Cost Guide 2025: What San Diego Homeowners Need to Know

Planning an Accessory Dwelling Unit (ADU) in 2025? One of the first questions homeowners ask is: how much will it cost? At Fabrick Construction, we specialize in building ADUs across San Diego County and believe in clear, transparent budgeting.

This guide breaks down realistic ADU costs in 2025, what drives the numbers, and how to budget for success.

Typical ADU Costs in San Diego (2025)

• Studio ADU: $140,000 – $200,000
• 1-Bedroom ADU: $180,000 – $260,000
• 2-Bedroom ADU: $230,000 – $350,000+

These ranges include design, permits, utilities, and construction. Actual costs depend on size, finishes, and site conditions.

What Impacts ADU Costs?

Several factors shape the final price of your ADU:

• Site conditions – slope, access, and distance to utilities
• Unit size – larger square footage means higher material and labor costs
• Finish level – basic vs. high-end cabinetry, flooring, and fixtures
• Permitting & fees – vary by city within San Diego County
• Structural complexity – foundation work, roof design, or special engineering

Cost Ranges:

While every project is unique, ADUs typically range between $335–$425 per square foot for projects 600 sq. ft. or larger. Larger units often bring the cost per square foot down slightly, while smaller ones may run a bit higher.

Final pricing depends primarily on structural requirements, utility runs, and finish selections.

How San Diego Homeowners Can Save

• Choose a simple footprint and roofline
• Keep plumbing stacked to minimize costs
• Select mid-range finishes that balance durability and value
• Finalize design decisions early to avoid change orders
• Bundle inspections and streamline scheduling

Long-Term Value of an ADU

An ADU isn’t just an expense — it’s an investment that can pay for itself over time. Benefits include:

• Rental income that offsets your mortgage
• Increased property value in competitive markets like La Jolla, Encinitas, and Carlsbad
• Flexibility for family, guests, or multigenerational living
• Compliance with California’s 2025 ADU laws, which favor homeowners

Why Work With Fabrick

At Fabrick Construction, we’ve built ADUs in neighborhoods from North Park and South Park to Chula Vista and Oceanside. Our homeowners choose us for:

• Transparent, line-item budgets
• Local expertise with San Diego ADU permitting
• Clear communication throughout the build
• Craftsmanship that stands the test of time

Ready to Get a Personalized ADU Estimate?

Every property is unique. Whether you’re in Point Loma, Carmel Valley, La Mesa, or anywhere in San Diego County, Fabrick can give you a clear cost plan tailored to your project.

👉 Book your free ADU consultation today and find out what your ADU will cost in 2025.

Disclaimer: The information provided here is for general informational purposes only and should not be considered financial advice. We are highlighting common industry trends and financing options that may be available to many homeowners. Every situation is unique, and we encourage you to consult with a qualified financial advisor or lender before making any decisions.