At Chris William Construction, we’re your trusted partner for building high-quality ADUs in the Bay Area. With 8+ years of experience, we focus on creating spaces that fit your lifestyle, whether it’s a cozy backyard cottage, a garage conversion, or a modern guesthouse. From design to final touches, we handle every step with top-quality craftsmanship and a stress-free process.
Our team works closely with you to understand your vision, budget, and timeline. We’ve helped hundreds of Bay Area homeowners add value to their properties with ADUs that look great and function perfectly. With clear communication, smart design, and local permit expertise, we make sure your project runs smoothly from start to finish. Let’s turn your ADU ideas into reality!
Start fresh with a brand-new ADU tailored to SF/Bay Area lifestyles. Whether you’re in San Mateo, Marin, or San Francisco, we handle site prep, permits, and construction for modern studios, two-story units, or eco-friendly designs that match your vision.
Turn your unused garage into a stylish living space! We handle insulation, electrical upgrades, and plumbing to create a cozy studio, guest suite, or rental unit to meet local codes. Perfect for adding value without expanding your home’s footprint.
Build a standalone ADU in your backyard for family, guests, or rental income. We design cottages that blend with your property, using durable materials and smart layouts to maximize space and comfort.
Own a duplex or multi-unit property? We design and build ADUs that comply with Bay Area zoning laws, adding legal units to boost rental income or house a family.
Stressed about SF Planning Department rules? We streamline ADU permits for San Francisco and Bay Area homeowners, creating code-compliant designs and submitting paperwork fast. Avoid delays and start building sooner!
We’ve built 200+ ADUs across San Francisco, Oakland, and San Jose. From Sunset District’s foggy weather to Berkeley’s strict zoning laws, we know how to adapt designs and permits for your neighborhood.
No more permit headaches! We handle SF Planning Department submissions, utility hookups, and inspections so you can focus on planning your new space. Our team keeps you updated weekly.
No two homes or families are the same. We tailor each ADU to match your goals, whether it’s extra income, space for loved ones, or simply more room to enjoy.
Get a detailed quote upfront, no hidden fees. We work with your budget and suggest cost-saving ideas, like energy-efficient materials or phased construction for tighter budgets.
As a trusted San Francisco ADU contractor, we use premium materials and licensed tradespeople. Every project includes a warranty, so your investment stays protected.
Yes, you need city permits. We handle the entire permit process for you, so you don’t have to worry about the paperwork.
From permits to finish, projects typically take 6–12 months. Garage conversions are faster (6–8 months), while new builds may take longer.
Yes, in most cases, you can rent it out for extra income. We make sure your ADU meets all rental code requirements.
Costs vary based on size, design, and features. We offer free estimates and walk you through the options that fit your budget.
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