Add Value With A Quality ADU
How it works
Our approach to your adus.
What's included
- Detached and attached ADU construction
- Garage conversion ADUs
- Junior ADU (JADU) builds
- Complete permit management
- Full kitchen and bathroom installations
- Energy-efficient construction
- Custom design to match your home
- Financing assistance available
ADUs questions, answered.
Common questions about adus in San Diego County
ADUs in San Diego typically rent for $1,500-$3,000+ monthly depending on size and location. Many homeowners see their construction costs recovered within 5-7 years through rental income.
Total timeline runs 8-14 months including design, permits, and construction. Our proactive permit management often shortens typical timelines.
Most San Diego properties can accommodate some form of ADU. Setbacks, lot coverage, and other factors determine size and placement. We provide free feasibility assessments.
Yes - comprehensive permit management is included with our ADU packages. We handle architectural plans, engineering, and all city submissions.
Still have questions?
Contact us at (760) 658-6238
Client stories
What our clients say.
BNC turned our unused backyard space into a beautiful rental unit. The permit process seemed daunting, but they handled everything. Now we have monthly income covering our mortgage.
Patricia W. - Poway
Explore more services
Related work, one team.
Pre-Construction
Pre-construction planning, architectural design & permits in San Diego County. Site analysis, engineering, Title 24 compliance & VR previews.
Learn MoreGarage Remodeling
Garage conversions and remodeling across San Diego County. Transform your garage into a living space, home office, ADU, or gym. Licensed & insured contractor.
Learn MoreNew Room Additions
Home additions in Escondido & San Diego County. Bedroom additions, home offices, family rooms & guest suites that seamlessly match your home. Permits included.
Learn MoreLearn more
Guides & recent projects.
Guides & articles
Featured projects
Service area
ADUs across San Diego County.
Ready to start your adus project?
Free consultations, transparent estimates, and a single team from first call to final walkthrough.
Building an ADU in Escondido?
We are headquartered in Escondido and have completed ADUs across the city, from Hidden Meadows to Eureka Heights. See our dedicated Escondido ADU page for lot rules, costs, and timelines specific to the city.
Free download
Get the BNC Builders ADU Handbook.
A practical guide that answers the questions San Diego homeowners actually ask before building an ADU — costs, permits, timelines, and what makes a project succeed.
- San Diego County ADU regulations and where you can build
- Step-by-step permit navigation that saves months
- Design and floor plan options for different lot sizes
- Realistic cost breakdowns and financing options
- ROI and rental income potential in today’s market