Fallbrook
A full ADU kitchen.
A detached ADU with a full kitchen, blue accent cabinetry, and quartz counters.
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ADU cost calculator · San Diego
Know What Your ADU Could Cost, Before You Commit.
Answer a few questions to see a preliminary cost range for your ADU. Then talk with BNC about what’s feasible on your property.
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ADU Cost Calculator
Step 1 of 6
What type of ADU?
Choose the option closest to your plan.
Transparent by design
What affects ADU cost.
A few things move the number more than anything else. Here’s what we look at when we review your project.
- 01
Site work
Grading, access, and foundation prep change with your lot.
- 02
Utilities
Water, sewer, and electrical connections vary by property.
- 03
Design
Layout, size, and complexity all shape the build.
- 04
Permits and fees
Local requirements and impact fees differ by jurisdiction.
- 05
Finish level
Cabinetry, flooring, and fixtures are a major cost lever.
Recent work
Real BNC ADU projects.
Fallbrook
A designer ADU bath.
A zellige tile shower, an arched niche, and an ornate vanity.
Fallbrook
Move in ready living.
A bright, staged living space in a finished detached ADU.
Fallbrook
A comfortable bedroom.
A clean, staged bedroom ready for a guest or a renter.
Fallbrook
A vanity with character.
An ornate vanity with a gold framed mirror and warm finishes.
How it works
Three simple steps.
- 01
Estimate your range
Use the calculator to see a preliminary cost range for your ADU.
- 02
Talk feasibility with BNC
A real person reviews your property and answers your questions.
- 03
Get a scoped proposal
After review, we put together a proposal scoped to your project.
Common questions
ADU calculator questions.
A few things homeowners ask before starting an ADU.
Still have questions? Call (760) 658-6238
No. It’s a preliminary range based on the details you entered. An accurate price requires a review of your property and project.
Site work, utility connections, design choices, and permit requirements all move the number. We review these with you before any pricing is final.
A short call where a BNC team member reviews your property and goals to talk through what’s feasible, the scope involved, and next steps.
We serve San Diego County, including Escondido, San Diego, Carlsbad, Poway, San Marcos, Vista, Rancho Bernardo, Encinitas, and Oceanside.
See a preliminary range for your ADU today.
Answer a few questions to see your range, then talk with BNC about what’s feasible on your property.