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A beautiful 3D architectural rendering of a modern ADU in a sunny San Diego backyard, show

ADU Contractor
Construction & Home Additions

San Diego, CA

Licensed & Insured General Contractor
60+ years Family Business

ADU's
Granny Flats
Guest Quarters
Garage Conversion
Home & Room Additions
Kitchen Extensions & Remodels
3D Designs and More!

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Contact Ritz Design Build

Transform Your Home with Expert Home Additions

Ritz Design Build is your trusted general contractor and home builder in San Diego, specializing in custom home additions, ADUs, and home renovations that enhance your living space and increase your property value. Our team is dedicated to turning your vision into reality, whether you're looking to expand your living area, add a new bedroom, build a custom ADU, or create a space tailored to your needs.

Homeowners searching for home additions in San Diego value thoughtful designs that complement their home's existing style while maximizing comfort, functionality, and property value. Ritz Design Build delivers customized solutions with quality craftsmanship and attention to detail.

From initial design and planning to construction and final occupancy, we manage every step of your project, including plans, permits, and building approvals. We prioritize clear communication, premium materials, and quality workmanship to make your home improvement experience as seamless and stress-free as possible.

Whether you're considering a room addition, second-story addition, garage conversion, or custom ADU construction in San Diego, Ritz Design Build is committed to delivering results that fit your home, lifestyle, and budget. Contact Ritz Design Build today for a consultation and discover how we can bring your home improvement vision to life.

Why Choose Ritz


*San Diego's Most Trusted General Contractor

*Free Estimates

*Licensed & Insured

*5 Star Rating with over 60 years of Experience. Read Reviews.

*Built on Integrity

*We handle all building permitting
A complete second home on your lot with its own kitchen, bathroom, and entrance. Built for rental income or family.

ADUs (Accessory Dwelling Units)

A complete second home on your lot with its own kitchen, bathroom, and entrance. Built for rental income or family.

Turn an underused garage into a rental, granny flat, home office, gym, or game room.

Garage Conversions

Turn an underused garage into a rental, granny flat, home office, gym, or game room.

Add living space above your existing home without giving up yard space.

Second-Story Additions

Add living space above your existing home without giving up yard space.

See your project in full-color 3D and walk through it virtually before we lift a hammer.

3D Design Center

See your project in full-color 3D and walk through it virtually before we lift a hammer.

A private space for family and guests on your property. No full kitchen, and it cannot be rented.

Granny Flats (Guest Quarters)

A private space for family and guests on your property. No full kitchen, and it cannot be rented.

Add bedrooms, a primary suite, or a family room that blends with your existing home.

Home Additions

Add bedrooms, a primary suite, or a family room that blends with your existing home.

Expand or remodel your kitchen for more space, storage, and room to gather.

Kitchen Extensions

Expand or remodel your kitchen for more space, storage, and room to gather.

 

Step 1: Design

Every great ADU starts with a clear picture of what you’re building. Our designer visits your property, measures your home and yard, and studies how a new space can fit your lot, your existing home, and the way you plan to use it. Whether it’s a rental unit, a place for family, or a room addition, we turn your ideas into a complete design package.

You’ll receive full-color 3D renderings, detailed floor plans, and elevations showing how the finished project will look from every side. You can also take a virtual walk-through of your design and see the layout, the flow between rooms, and the finishes before any work begins. We make changes on screen, where they’re easy, so there are no surprises once construction starts. Everything is settled before we lift a hammer.

 

Step 2: Permitting

ADU rules change from one jurisdiction to the next, and a missed requirement can cost you months. Ritz has been building in San Diego County since 1965, and that experience means we know how local permitting works. Before we start designing, we research your specific property so the plans account for setbacks, zoning, utilities, and any site limits up front.

We also stay current with State, County, and city regulations, which change often, especially for ADUs. When the design is final, we prepare and submit your complete permit package. We don’t hand it off and hope for the best. We follow it through plan check, answer questions from the reviewers, and keep it moving until your permit is issued. You don’t have to learn the permitting process or wait on city hall yourself.

 

Step 3: Construction

Once the permit is in hand, our field team takes over. These are the same professionals who have worked together for years, and that shows in their coordination, their craftsmanship, and the way they treat your property. Experienced crews work faster, catch problems earlier, and take pride in the details. You can feel confident your home is in experienced hands.

Even a well-planned project brings decisions along the way, such as fixture selections, small adjustments, or questions about progress. The Ritz office staff is available throughout the build to help, so you always have someone to call and never have to guess what comes next.

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Ritz Projects

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THE PEIFERS

built a garage conversion

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THE GILLS

built a 1 Bedroom ADU

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