Are you looking to expand your living space, create an income-generating rental, or accommodate family members on your property? A granny flat, also known as an ADU (Accessory Dwelling Unit), is one of the smartest and most flexible investments for homeowners in San Diego. With real estate prices on the rise and multigenerational living on the rise, building a custom granny flat offers long-term value and versatility.

At Coast Design Build, we specialize in designing and constructing high-quality granny flats tailored to your property, lifestyle, and budget. As a leading granny flat contractor in San Diego, we bring creativity, experience, and efficiency to every build.

What Is a Granny Flat?

A granny flat is a small, self-contained living unit located on the same lot as a single-family home. It typically includes a bedroom, bathroom, kitchen, and living area. These units can be attached, detached, or converted from an existing structure like a garage or basement.

Granny flats are ideal for:

• Housing aging parents or family members

• Creating a guest house or private retreat

• Generating passive income through long-term or short-term rentals

• Providing a private home office or studio space

Thanks to California’s updated ADU regulations, it’s now easier than ever to build a granny flat in San Diego — and the benefits are significant.

Benefits of Building a Granny Flat in San Diego

1. Flexible Living Space

A granny flat gives you added space that can adapt to your needs over time. Whether you’re supporting a family member today or renting it out tomorrow, it’s a smart way to maximize your property’s potential.

2. Rental Income

In high-demand neighborhoods across San Diego, a granny flat can serve as a reliable income stream. Long-term rentals and Airbnb-style units are popular options for earning extra cash without leaving your home.

3. Increased Property Value

Well-designed ADUs and granny flats can significantly increase your home’s resale value and appeal to future buyers looking for multi-functional living.

4. Privacy & Independence

Give guests or family members their own space while keeping them close. Granny flats are perfect for maintaining privacy while offering convenience and connection.

Why Choose Coast Design Build?

When building a granny flat, choosing the right contractor is essential. At Coast Design Build, we’ve earned a reputation as one of the top granny flat contractors in San Diego by offering:

• ✅ Custom Designs Tailored to Your Lot & Needs

• ✅ Expert Permit Handling & City Code Compliance

• ✅ Efficient, On-Time Construction

• ✅ High-Quality Materials & Finishes

• ✅ Clear Communication & Project Management

Our experienced team will guide you from concept to completion — handling everything from architectural design and structural engineering to permitting, construction, and final inspection.

We work with lots of all sizes and shapes, helping you make the most of your space while following San Diego’s zoning and building requirements.

How Much Does a Granny Flat Cost in San Diego?

Granny flat costs depend on size, design, finishes, and site conditions. On average, you can expect to spend between $120,000 and $300,000+ for a high-quality build in San Diego.

Factors that affect pricing:

• Detached vs. attached or garage conversion

• Utility connections and site access

• Square footage and number of bedrooms/bathrooms

• Interior features and finishes (custom kitchens, smart home tech, etc.)

We provide detailed, transparent estimates so you can plan your investment wisely — and we’re happy to work within your budget to find the best design solution.

Let’s Build Your Perfect Granny Flat

Whether you’re planning for family, future income, or personal lifestyle upgrades, Coast Design Build is your trusted granny flat contractor in San Diego. We combine modern design, high-quality construction, and personalized service to deliver a unit that’s beautiful, functional, and built to last.

📞 Contact us today for a free consultation and discover how a custom granny flat can enhance your home, your lifestyle, and your financial future.