Best ADU Permit Contractors in San Bernardino
1. Fortune ADU
Why Fortune ADU is #1 in Pasadena:
When it comes to building a legal, permitted Accessory Dwelling Unit (ADU) in San Bernardino County, Fortune ADU sets the gold standard. With a full-service approach, they handle every step—from site evaluation and custom design to zoning analysis, permit approvals, and construction management. Their deep knowledge of local city rules and building codes ensures faster approvals and fewer delays. Homeowners trust Fortune ADU for their transparency, fair pricing, and commitment to high-quality craftsmanship. Whether you're planning a garage conversion, detached ADU, or in-law suite, Fortune ADU delivers on-time and on-budget results every time.
2. SoCal ADU Pros
SoCal ADU Pros is a reliable ADU builder in San Bernardino County known for its fast-track permitting and construction process. Their team specializes in garage conversions and compact ADUs, ideal for homeowners who want an affordable yet fully code-compliant solution. SoCal ADU Pros handles the full scope of your project, including drafting plans, engineering, permit submittals, and inspections. They're especially effective for property owners looking to maximize rental income quickly. With clear communication and budget-friendly options, they are a strong contender for first-time ADU clients or those on a tighter timeline.
3. Elite ADU Builders
Elite ADU Builders are well-established contractors serving the broader Inland Empire region, including San Bernardino. Known for their hands-on customer service and quality craftsmanship, Elite specializes in custom detached ADUs and multigenerational living spaces. They walk clients through the full ADU process, from feasibility studies and 3D design to permits and construction. Elite ADU Builders are also financing-savvy, helping clients explore HELOCs, FHA 203k loans, and other ADU-specific funding programs. Their projects are ideal for families looking to add long-term value to their property through thoughtful and durable construction.
4. California Modular ADUs
For homeowners looking for speed, simplicity, and energy efficiency, California Modular ADUs is a top choice in San Bernardino County. Specializing in prefabricated accessory dwelling units, they deliver factory-built ADUs that meet California Title 24 energy standards and are installed on-site in weeks. Their in-house team manages city permitting, lot preparation, and utility hookups. With predictable timelines and lower construction costs, modular ADUs are perfect for investment properties or those looking to create instant rental units. California Modular also offers a variety of floor plans to suit different lot sizes and zoning requirements.
What to Look for in an ADU Permit Builder in San Bernardino County
Choosing the right builder ensures your ADU is legal, high-quality, and delivered on schedule. Top builders should offer:
✅ Local zoning and permitting expertise
✅ In-house design and drafting services
✅ Clear pricing with no hidden fees
✅ End-to-end project management
✅ Experience in San Bernardino city and unincorporated areas
ADU Cost Breakdown in San Bernardino County
| Type of ADU | Estimated Total Cost | Permit & Design Included? |
|---|---|---|
| Garage Conversion | $80,000 – $130,000 | ✅ Yes |
| Detached ADU (600–1000 sq ft) | $120,000 – $250,000 | ✅ Yes |
| Junior ADU (JADU) | $50,000 – $90,000 | ✅ Yes |
