In a city where space is at a premium and housing demand continues to rise, Accessory Dwelling Units (ADUs) have become one of the most popular and practical ways to add livable square footage to your property. Whether you’re looking to create a rental unit, a private suite for extended family, or a home office retreat, partnering with the leading experts in ADU construction in San Diego is key to making your vision a success.
At Coast Design & Build, our team specializes in designing and building custom ADUs that add value, functionality, and style to your property—while navigating San Diego’s complex zoning regulations and permit requirements with ease.
What Is an ADU?
An ADU, or Accessory Dwelling Unit, is a self-contained living space that sits on the same lot as a single-family home. Often referred to as granny flats, in-law units, or backyard cottages, ADUs typically include a kitchen, bathroom, sleeping area, and separate entrance.
In San Diego, ADUs can take several forms:
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Detached ADUs – freestanding units built in the backyard
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Attached ADUs – units built as an extension of the main house
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Garage conversions – turning an existing garage into a livable unit
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Junior ADUs (JADUs) – smaller units created within the existing home footprint, often with shared facilities
Why Build an ADU in San Diego?
Homeowners across San Diego are investing in ADUs for a wide range of reasons:
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Passive income: Rent out your ADU for monthly income in a high-demand rental market
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Multigenerational living: Provide privacy and independence for aging parents or adult children
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Home office or studio: Escape household distractions with a separate, fully functional workspace
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Guest accommodations: Create a comfortable place for visitors without sacrificing your own space
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Property value boost: A well-designed ADU adds significant value and appeal to your home
With recent changes in California state laws, it’s easier than ever to get approval for ADUs—especially with help from experienced professionals who understand the process inside and out.
The Importance of Working with ADU Experts
Building an ADU is more complex than a typical home addition. It involves specific zoning rules, setbacks, design guidelines, and construction requirements. That’s why working with seasoned ADU experts in San Diego is essential for a smooth, compliant, and successful project.
At Coast Design & Build, we provide end-to-end services including:
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Site assessment & feasibility studies
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Custom ADU design
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Permit application & approval handling
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Budget planning & material selection
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Full construction & project management
We guide you every step of the way, ensuring your ADU meets your needs and complements your existing property, both visually and structurally.
What Makes a Great ADU?
A successful ADU is one that feels like a true home—compact but complete, private yet integrated with your property.
Key features include:
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Open, functional layouts that make the most of small spaces
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Natural lighting and ventilation for a bright, welcoming environment
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Quality materials and finishes that are durable and easy to maintain
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Energy-efficient systems including LED lighting, insulation, and smart thermostats
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Outdoor access via private entrances, patios, or small decks
At Coast Design & Build, we design every ADU with intention—balancing comfort, code compliance, and long-term value.
Why Choose Coast Design & Build?
We’re not just builders—we’re partners in helping you realize your vision for smart, flexible living. Here’s what sets our ADU services apart:
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Local expertise in San Diego zoning and permitting
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In-house design & architecture team
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Transparent pricing & project timelines
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High-quality workmanship backed by years of experience
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Personalized service from concept to completion
From your first consultation to the final inspection, we handle every detail so you can enjoy peace of mind and a beautiful finished product.
Ready to Build Your ADU?
If you’re thinking about building an ADU in San Diego, the time to start is now. Whether you’re creating an income stream, expanding living space, or preparing for future needs, an expertly designed ADU can transform your property and your lifestyle.
Contact Coast Design & Build today to schedule a consultation with San Diego’s trusted ADU experts. Let’s turn your backyard into your biggest opportunity.
