Granny Flats vs. Garage Conversions: Which ADU Is Right for Your San Diego Property?

Thinking About Adding an ADU in San Diego?

With San Diego’s real estate market booming and housing demand rising, more homeowners are exploring Accessory Dwelling Units (ADUs) to maximize space and income potential. Whether you're looking to create a cozy living space for family or earn rental income, building an ADU is a smart move. But the big question is: Should you go with a granny flat, a garage conversion, or a Junior ADU (JADU)?

Let’s break down the pros, cons, and use cases for each option so you can decide what works best for your property and goals.

What Is a Granny Flat?

A granny flat, also known as a detached ADU, is a self-contained unit located in the backyard or elsewhere on your lot. It’s entirely separate from the main house and includes its own entrance, kitchen, bathroom, and living space.

✅ Pros:

• Total privacy for tenants or family

• Rental income potential without sacrificing main home space

• Increases property value significantly

• Fully customizable in size and design

❌ Cons:

• Higher upfront cost compared to other ADU types

• Requires more permitting and zoning review

• Takes longer to build (average: 6–12 months)

What Is a Garage Conversion ADU?

A garage conversion ADU transforms your existing garage into a livable unit. It's a cost-effective way to add housing without major construction or sacrificing yard space.

✅ Pros:

• Lower construction costs (uses existing structure)

• Faster timeline (often completed in 3–6 months)

• Keeps outdoor areas intact

• Perfect for rental income or housing adult children

❌ Cons:

• May reduce parking availability

• Limited by garage size and layout

• Less privacy if attached to the main house

What About JADUs (Junior ADUs)?

A Junior ADU (JADU) is a small living space (max 500 sq. ft.) created within your existing home. Think of it as a converted bedroom or section of your house with a kitchenette and a separate entrance.

✅ Pros:

• Minimal cost to build

• Simpler permits and zoning process

• Great for multigenerational families

❌ Cons:

• Cannot be rented separately in all cases

• Must be attached to the primary home

• Limited in size and privacy

Which ADU Type Is Best for Your San Diego Property?

Feature	Granny Flat	Garage Conversion ADU	Junior ADU (JADU)
Construction Cost	$$$	$$	$
Privacy	High	Moderate	Low
Rental Income Potential	High	High	Medium (depends)
Permitting Complexity	Moderate–High	Moderate	Low
Best For	Long-term rentals, guest house	Budget-conscious homeowners	Family housing, in-laws

San Diego ADU Considerations

Before making a decision, keep these in mind:

• Local zoning laws: San Diego allows both detached and attached ADUs, but lot size and location can impact what's allowed.

• Utilities: Detached ADUs may require new utility hookups, while conversions can often share existing systems.

• Parking requirements: Some ADU types may trigger new parking space mandates (though many are waived under new state laws).

Final Thoughts

If you have the space and budget, a granny flat in San Diego offers the most long-term value and flexibility. On a tighter budget or shorter timeline? A garage conversion ADU may be the ideal middle ground. And if you’re focused on affordability or family use, a JADU is a great low-cost solution.

Ready to Build an ADU in San Diego?

Whether you're dreaming of a detached granny flat or exploring garage conversions, our expert team is here to help you design, permit, and build the perfect ADU for your property.

👉 Contact us today for a free ADU consultation. Call Today! 858-414-7318