ADU Solutions
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Building an ADU is a major project, and local experience matters. JL Home Service has 5+ years of experience building ADUs and remodeling homes in Contra Costa County, giving us a strong understanding of local homes, project requirements, and the challenges that can come with ADU construction.
From detached backyard units to garage conversions and additions, we help homeowners plan and build ADUs that fit their property, budget, and needs. We handle the project from the early planning stages through construction, coordinating the work needed to turn your ADU plans into a finished living space.
Because we work throughout Contra Costa County, we understand that every property is different. Lot size, existing structures, access, utilities, zoning requirements, and the design of your home can all affect how an ADU project should be approached. Our goal is to help you make informed decisions and build an ADU that adds useful living space and long-term value to your property.
What We Do
A detached ADU is a standalone structure built separately from the main house, typically in the backyard. Because it has its own entrance and complete separation from the primary residence, it offers the highest level of privacy.
This is often the preferred option for homeowners who plan to rent out the unit or create independent living space for family members. A detached ADU can feel like a completely separate home while still being located on the same property.
An attached ADU is connected to the existing home while maintaining its own entrance, kitchen, bathroom, and living space. It functions as an independent dwelling without requiring a completely separate structure.
The biggest advantage is that it often costs less to build than a detached ADU since it can share portions of the existing home’s structure and utilities. It’s an excellent choice for homeowners who want additional living space while maximizing their available budget.
A Junior ADU is a smaller unit created within the existing footprint of a home, often by converting a spare bedroom, unused section of the house, or other underutilized space. JADUs are typically limited in size and are designed to make efficient use of space.
For homeowners looking for a lower-cost way to add living space, a JADU can be an attractive option. It allows you to create housing for a family member or generate additional income without a major construction project.
A garage conversion transforms an existing garage into a fully functional living space. Instead of building a new structure from the ground up, the existing framework is repurposed into an ADU.
Many homeowners choose this option because it makes use of space they already have. If your garage is primarily being used for storage, converting it into an ADU can provide significantly more value while often reducing construction costs and timelines.
A basement ADU converts an existing basement into a separate living unit with its own amenities and private living space. This type of ADU takes advantage of square footage that’s already part of the home.
The primary benefit is that you’re expanding usable living space without changing the home’s footprint. For properties with suitable basements, this can be one of the most efficient ways to add housing while preserving outdoor space.
A bump-out ADU is created by extending a portion of the existing home to add the space needed for an independent living area. Rather than building a completely separate structure, the home is strategically expanded to accommodate the ADU.
This option works well for homeowners who don’t have enough yard space for a detached unit but still want the benefits of an ADU. A bump-out can provide the additional room needed while maintaining the overall character and layout of the property.
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Our values
FAQs
The cost to build an ADU in Contra Costa County typically ranges from $150,000 to more than $450,000, depending on the size, design, site conditions, and level of finishes. For new construction, a general starting range is $250 to $400 per square foot, although more complex projects can cost more.
Building an ADU in Contra Costa County typically takes 7 to 14 months from initial planning to completion. This includes about 2 to 5 months for design and engineering, 2 to 4 months for permits and approvals, and 4 to 8 months for construction. The actual timeline can vary based on the ADU’s size and design, site conditions, permit requirements, and the complexity of the construction.
Contact our team today to schedule a consultation and get started on a custom ADU designed for your property.
