Looking to add living space, rental income, or a private unit for family? Our ADU construction services in Foster City, CA help homeowners build high-quality, code-compliant accessory dwelling units designed for long-term value
When planning your new ADU, there are several important site preparation, design, and construction considerations we bear in mind.
Your accessory dwelling unit needs to fit in with the style and look of the surrounding property and neighborhood.
This depends on whether you plan to rent your ADU or use it as a family annex. If renting in Bay Area, some tenants may require certain levels of privacy
Before making any designs, we consider how you want to use your dwelling unit and ensure enough space. If it is too small, the unit could feel restrictive, while if it is too big, it may fall foul of Bay Area ADU construction laws.
Ensuring all units have an open route to the street for accessibility and safety reasons. If you have tenants, it’s important to consider more private access routes that bypass your main home area and other accessibility features such as wheelchair ramps and handrails.
Depending on your location, Bay Area ADU construction regulations and local zoning laws will guide us through the structural design of your unit.
We take site analysis and preparation seriously to get the right type of foundation and structural quality for your unit.
Our ADUs are more spacious by considering brilliant views, windows/doors, and outdoor spaces for better living.
Building an ADU in Foster City requires in-depth knowledge of local zoning laws, coastal considerations, and California ADU regulations. Our team brings hands-on experience constructing ADUs across Foster City, giving homeowners confidence that their project is handled correctly from day one.
Why homeowners trust us:
We provide end-to-end ADU construction services in Foster City designed to meet local zoning laws, California ADU regulations, and your long-term property goals. From feasibility analysis and design to permits and construction, our team delivers compliant, high-quality ADUs that increase usable space and property value while ensuring a smooth, stress-free build process.
Our detached ADU construction in Foster City, CA is ideal for homeowners seeking rental income, guest housing, or independent living space. We design and build fully separate units that offer privacy, functionality, and architectural compatibility with your primary residence. Each detached ADU is built to meet Foster City zoning, setback, and utility requirements while maximizing lot usage.
Our attached ADU builders in Foster City, CA create seamless additions that extend your existing home without compromising layout or curb appeal. Attached ADUs are ideal for multigenerational living, home offices, or rental units. We carefully design each project to comply with Foster City setback rules while ensuring proper access, privacy, and energy efficiency.
With our garage conversion ADU services in Foster City, we transform underutilized garages into modern, code-compliant living spaces. This cost-effective ADU option reduces construction time while adding significant value to your home. We handle structural upgrades, insulation, plumbing, and electrical work to ensure your converted ADU meets all local building and safety standards.
As your Bay Area ADU construction contractor, DevArt8 Builders will help you plan, design, and build any of the four main types of accessory dwelling units.
Only one ADU is allowed per primary dwelling. ADUs are allowed in single-family residential areas and on any lot with a permitted single-family home in a multi-family residential area.
Lots under 8,500 sq. ft. require ADUs of about 275 - 640 sq. ft. with a maximum of one bedroom. Lots over 8,500 sq. ft. can have ADUs up to 800 sq. ft. with a max of two bedrooms. ADUs converted from existing single-family homes can't be larger than 25% of the main structure.
ADUs must comply with the same setbacks as the main dwelling, except if above a detached garage. Detached ADUs must be located at least 10 feet from the main dwelling. When above a detached garage, ADUs must have a 5-foot setback from interior side yards, a 5-foot rear yard setback, and a 20-foot street side yard setback on corner lots.
Detached accessory units must be one-story and not exceed 12 feet in height unless a higher-pitch roof is required to match the main dwelling. When located above a detached garage, the height should not go beyond 30 feet.
We follow a structured, homeowner-friendly process that minimizes delays and eliminates uncertainty.
Initial Property Assessment – Evaluate zoning, lot size, and feasibility
ADU Design & Planning – Custom layouts aligned with Foster City codes
Permits & Approvals – Full handling of city permits and documentation
Construction Phase – Managed, inspected, and code-compliant build
Final Inspection & Handover – Ready-to-live ADU with all approvals
This approach ensures your Foster City ADU project is completed efficiently and correctly.