In San Diego, Accessory Dwelling Units (ADUs) have become one of the most effective ways to boost property value, create rental income, and provide flexible living spaces. Whether you're planning a granny flat, backyard home office, or multigenerational suite, choosing the right ADU contractor is critical to your project's success.
In this blog, we’ve curated a list of top ADU contractors in San Diego for 2025 — based on experience, reputation, service scope, and client satisfaction.
1. Fortune ADU – San Diego’s Premier ADU Contractor
Fortune ADU is widely recognized as one of the top ADU builders in San Diego. With a dedicated focus on ADUs, they provide end-to-end design-build services tailored to homeowners looking for quality, compliance, and creativity.
🔍 What Makes Fortune ADU the Best?
Full-Service ADU Solutions: From planning and permitting to construction and final inspection, Fortune ADU manages every step.
San Diego Zoning Expertise: They understand the ins and outs of city regulations, fast-tracking your permits and approvals.
Customized ADU Designs: Choose from pre-designed layouts or create a custom ADU that fits your backyard and budget.
Energy-Efficient Builds: Fortune ADU integrates green building practices to keep energy bills low and comfort high.
Transparent Pricing: No hidden fees or confusing contracts — just clear communication and fair quotes.
2. Nexus Construction
Nexus Construction is a respected San Diego general contractor that also specializes in ADUs. They’re known for high-quality work and modern, space-efficient designs.
Why Homeowners Choose Nexus:
Over 15 years of experience in custom residential construction
Creative architectural solutions that enhance small spaces
Personalized service with detailed planning support
Strong portfolio of completed ADUs across San Diego County
3. AB Design + Build
AB Design + Build brings together architecture and construction under one roof. They focus on building modern, eco-conscious ADUs that are both functional and stylish.
Highlights:
Contemporary and sustainable design options
Excellent track record with detached and attached ADUs
Collaborative planning process that involves homeowners
Emphasis on energy-efficient materials and solar integration
4. Urban ADU
Urban ADU is ideal for those looking for compact, minimalistic, and efficient ADU designs in San Diego’s urban neighborhoods. Their builds are tailored for small lots and tight backyards.
What Sets Urban ADU Apart:
Focus on urban lot optimization
Simple, smart designs for quick builds
Strong emphasis on affordability and fast permitting
Ideal for small families, renters, or guest suites
5. Harris Builders
With decades of experience, Harris Builders has earned a reputation for quality and dependability. They’re a great choice for budget-conscious homeowners looking to add livable space without overextending their finances.
What You Get:
Practical design + build packages
Affordable pricing with clear cost breakdowns
ADUs designed for rental income or in-law use
Excellent customer service and post-build support
Why Build an ADU in San Diego?
San Diego’s climate, housing market, and progressive zoning laws make it an ideal place to invest in an ADU. Here are some benefits:
Rental Income: Rent out your ADU to offset your mortgage.
Multigenerational Living: House parents, in-laws, or adult children comfortably and privately.
Increased Property Value: ADUs can boost your home’s market value by up to 30%.
Sustainable Housing: Smaller homes have a smaller footprint and lower energy needs.
