About The ADU Pro – Accessory Dwelling Unit Builder in Fontana and Southern California
The ADU Pro® is a licensed, full-service ADU contractor headquartered in Chino, California. Founded by DJ Messina, who brings over 30 years of construction experience to the business, the company holds CSLB license #1128679 and carries a BuildZoom score of 139, placing them in the top 1% of all California contractors. They serve homeowners throughout Orange County, Los Angeles County, and Riverside County — including the Fontana area.
Unlike general remodeling companies that have added accessory dwelling units to a broader service list, The ADU Pro® focuses exclusively on ADU construction. This singular focus shapes how they approach every project, from initial planning through to final inspection.
Their team handles the entire process under one roof: site assessment, custom design, structural engineering, permit applications, city coordination, construction, and final inspection walkthrough. Clients work with one team from start to finish, rather than coordinating between multiple vendors.
ADU Building Services in Fontana
The ADU Pro® offers a range of accessory dwelling unit construction services in the Fontana area. Whether a homeowner is looking for a detached ADU builder, a garage conversion contractor, a granny flat builder, or an in-law suite builder, The ADU Pro® positions itself as a comprehensive solution for Southern California homeowners.
Each ADU is designed with multiple uses in mind. Units can serve as guest accommodations, rental income properties, spaces for elderly family members, or additional living quarters. Standard features typically include full kitchens, bathrooms, and laundry facilities, making each unit functional as an independent living space.
The company uses locally sourced, ethically sourced building materials across their builds. Because they maintain oversight of the entire construction process, they are able to offer a lifetime warranty on their ADU build-outs — a warranty that is also transferable to future homeowners upon sale of the property.
Their process begins with planning and permitting, moves through design and engineering, and concludes with the completed build. Throughout each stage, they maintain communication with the client and address questions and concerns as they arise.
Return on Investment and Property Value
Adding an ADU to a property in Fontana can have a meaningful impact on its resale value. The ADU Pro® notes that, on average, an accessory dwelling unit can add between $200,000 and $500,000 to a property's resale value, though this figure varies depending on location, size, and materials used.
Homeowners often ask about the effect of ADU construction on property taxes. Generally, property taxes tend to rise by approximately 1–1.2% of the cost of the ADU construction — a relatively modest increase compared to the potential gain in property value.
There may also be opportunities to take advantage of tax write-offs and deductions related to ADU construction expenses, which can make the overall investment more financially practical. The ADU Pro® works with clients across a range of budgets and can assist in exploring financing options for those who need them.
Located in Chino, CA — centrally positioned within the tri-county service area — The ADU Pro® is within approximately 30 miles of the majority of homeowners they serve. This proximity supports faster site visits, more efficient permit coordination, and more responsive project management compared to contractors based further away.
DJ Messina personally oversees quality control on every project and remains the direct point of accountability for each client. His background spans residential homes, commercial structures, multi-family buildings, and civil infrastructure work — experience that informs how The ADU Pro® approaches the challenges that can arise during ADU builder projects in Southern California.