Top ADU Builders in San Diego, California

As the demand for Accessory Dwelling Units (ADUs) continues to rise across California, homeowners in San Diego are turning to reputable ADU builders for fast, cost-effective, and city-approved solutions. Whether you're expanding your family space, adding a rental unit, or increasing your property’s value, choosing the right ADU builder is essential.

1. Fortune ADU – San Diego’s Permit-Ready ADU Experts

Fortune ADU stands out as a leading force in San Diego’s ADU industry, offering shelf-ready and custom ADU plans that streamline the design–permit–build process under one roof. They work closely with homeowners and city officials to speed up approvals and eliminate red tape, saving time and money.

Key Highlights:

• Permit-Ready ADU Plans: Pre-approved by San Diego authorities.

• One-Stop Service: From architecture and engineering to construction.

• Affordable Solutions: Transparent pricing and financing options.

• Experience: Years of experience with San Diego zoning and codes.

• Design–Permit–Build: Fully managed workflow.

• Free Consultations: Available for first-time homeowners.

Whether you're interested in garage conversions, detached units, or junior ADUs, Fortune ADU simplifies the journey—offering peace of mind and expert service at every step.

2. SnapADU – High-End Custom ADU Construction

SnapADU is known for its professional approach to designing and building custom ADUs throughout San Diego County. With a robust team of designers, project managers, and builders, SnapADU caters to clients who want modern and premium ADU features.

Services Include:

• Custom-designed detached and attached ADUs

• Project feasibility studies

• In-house permitting and planning

• Detailed 3D design previews

• Turnkey construction

3. San Diego ADU – Local Knowledge, Streamlined Builds

This builder offers specialized services for homeowners wanting quick ADU approvals without sacrificing quality. San Diego ADU has a reputation for local code expertise and cost-effective builds, making them a solid choice for budget-conscious clients.

What They Offer:

• Cost-efficient design packages

• Assistance with city-specific guidelines

• Full-service from design to build

• Focus on detached and attached ADUs

• Consultation on ADU financing

4. Modative – Architect-Driven Modern ADUs

Modative operates in Southern California, including San Diego, with a focus on modern, architecturally unique ADUs. If aesthetics, sustainability, and long-term value are your priorities, Modative brings architectural sophistication to the ADU space.

Key Features:

• Sleek, contemporary designs

• ADU prototypes ready for customization

• Emphasis on sustainable building materials

• Strong architecture + build integration

• Zoning research & property analysis

5. Action ADU – Expanding Across Southern California

Action ADU, though originally focused on Northern California, has expanded to serve San Diego homeowners with scalable and modular ADU solutions. Their structured process and predictable timelines are ideal for homeowners wanting professional guidance at each phase.

Benefits Include:

• Simplified 6-phase process

• Transparent timelines and pricing

• Homeowner education materials

• Financing partnerships

• Custom and pre-designed plans

Comparing Top ADU Builders in San Diego