Spanish Style Casita in Del Mar Mesa
Belmont Trail Court, San Diego, CA 92130
Homeowner Story: House younger family
Special Circumstance: HOA
Video TourStunning Spanish Style Casita in the Alta Del Mar Mesa HOA
This 1,200 sqft custom Spanish style casita in Del Mar Mesa, San Diego was thoughtfully crafted to complement the primary home and meet the Alta Del Mar Mesa HOA requirements. It serves as a beautiful independent living space for the owners’ adult daughter. With its timeless aesthetic and future ready features, it also provides the flexibility for the homeowners to downsize and enjoy the space themselves in the years to come.
Exterior Highlights
The exterior of this casita was meticulously designed to blend seamlessly with the main residence. Recessed doors and windows, a classic tiled roof with striking rafter tails, and a smooth Santa Barbara stucco finish contribute to its authentic Spanish style. French doors with detailed trimwork enhance the home’s character while inviting natural light inside and creating a seamless connection to outdoor living spaces. Every design choice was made to ensure this ADU not only met HOA requirements but also complemented the surrounding neighborhood. Read more about building an ADU in an HOA and custom ADUs.
Interior Highlights
Inside, the thoughtfully planned layout offers both style and functionality. The open-concept kitchen features an oversized island, a spacious pantry, and sleek neutral gray cabinetry topped with quartz countertops, creating a perfect balance of elegance and practicality. A sophisticated mix of lighting, including beautiful chandeliers and pendant fixtures, enhances the inviting atmosphere. Multiple clerestory windows bring in abundant natural light, making the space feel bright and airy. To accommodate evolving needs, the primary suite includes wider doorways for accessibility, ensuring the home remains comfortable and functional for years to come. Read more about designing an ADU for multigenerational living.
Floor Plan:
Custom ADU Floor Plan
Community:
The City of San Diego ADU Guide
With more than 70 ADU projects completed or in progress throughout the City of San Diego, we’ve seen firsthand how the city’s regulations create opportunities that are not available in many other jurisdictions.
One of the biggest differentiators is San Diego’s Affordable ADU Bonus Program, which allows qualifying properties to add multiple ADUs when some units are rented at affordable rates. This has made San Diego a leader in ADU development and has opened the door for homeowners and investors to create additional housing beyond what is typically allowed under state law.
In 2025, the city became the first jurisdiction in San Diego County to adopt AB1033, allowing qualifying ADUs to be sold separately from the primary residence. As of June 2026, only the County of San Diego and the City of San Diego have adopted AB1033.
San Diego also offers significant flexibility in the types of ADUs that can be built. The city allows two-story ADUs, ADUs with garages, ADUs with guest quarters, ADUs with rooftop decks, front yard ADUs, and stacked ADUs for multi-unit projects. We’ve worked on all of these project types throughout the city.
Another unique aspect of San Diego is its setback regulations. Many single-story ADUs can be built with 0-foot side and rear setbacks, creating opportunities on properties where space is limited. However, building too close to property lines can trigger additional fire-rating requirements and construction challenges, which is why thoughtful site planning remains critical even when the regulations appear flexible.
San Diego ADU Permitting
Most ADU permits in the City of San Diego are approved within approximately 3 to 5 months after submission, although timelines vary depending on project complexity and city workload.
Compared to many other jurisdictions in San Diego County, the City of San Diego has some of the highest ADU permit fees. Permit costs often range from approximately $26-$28 per square foot, though smaller ADUs under 500 square feet can benefit from reduced fees closer to $14 per square foot. We maintain a detailed breakdown of City of San Diego permit fees, including plan check fees, building permit fees, impact fees, and inspection fees, in our ADU permit fee guide.
Approximately 10% of our City of San Diego projects are located within the Coastal Zone. While coastal properties often raise concerns for homeowners, many ADUs qualify for exemptions from Coastal Development Permit requirements under the City’s updated Local Coastal Program. Learn more about building an ADU in the Coastal Zone.
Working with an experienced ADU builder helps identify potential permitting requirements early and creates a more predictable path through design and permitting.
