Services
ADU Construction
What Is an ADU and Why Build One?
Accessory Dwelling Units (ADUs) — sometimes called granny flats, in-law units, or backyard cottages — have become one of the most popular ways for Bay Area homeowners to expand their living space and increase property value.
An ADU is a self-contained secondary living space built on your property. It can be detached, attached to your main home, or converted from an existing structure like a garage or basement. Designed right, an ADU provides flexibility, functionality, and long-term value — whether you use it for family, guests, or as an additional income stream.
Why ADUs are a smart investment:
Additional Living Space: Perfect for aging parents, adult children, or visiting guests.
Rental Income: Generate consistent income with a long-term or short-term rental.
Increased Property Value: Boost your home’s resale potential and market appeal.
Multi-Generational Living: Keep family close while maintaining independence.
Sustainability: Smaller footprints, energy-efficient systems, and modern materials.
How Cole Construction Makes It Simple
We bring organization, creativity, and hands-on management to each project, ensuring your build is efficient, compliant, and visually stunning.
Here’s how we make it simple and stress-free:
Site Evaluation & Feasibility Study
Before design begins, we assess your property to identify the best placement, size, and layout for your ADU.
Evaluate zoning, setbacks, and utility access.
Review city regulations and lot constraints.
Discuss potential layouts, design ideas, and budget expectations.
Outcome: A clear understanding of what’s possible for your property.
Custom Design & Planning
We don’t have in-house architects, but we work closely with trusted partners to create build-ready ADU plans.
After evaluating your property, we collaborate with our designers and architects to develop:
Efficient floor plans
Exterior designs that match your home
Sustainable and energy-smart recommendations
Outcome: A clear, cohesive design prepared for city review and approval.
Permitting & Approvals
California ADU laws can be complicated, but we handle all the paperwork and submissions on your behalf.
Full coordination with your city’s building department.
Permit application, plan review, and code compliance management.
Fast-tracked approvals thanks to our local experience.
Outcome: A smooth, stress-free permitting process — without costly delays.
Construction & Project Management
This is where your ADU comes to life. Our experienced team manages every phase with precision and communication.
On-site supervision and daily progress tracking.
Coordination of subcontractors, materials, and inspections.
Clear weekly updates so you always know where your project stands.
Outcome: A beautifully built ADU delivered on time and within budget.
Finishing & Delivery
We complete every project with the same attention to detail we bring to full-scale custom homes.
High-quality finishes and craftsmanship.
Clean job site and professional handoff.
Final walkthrough to ensure everything exceeds expectations.
Outcome: A finished ADU that’s move-in ready, modern, and built to last.
Why Homeowners Trust Cole Construction for ADUs
The Bay Area’s ADU boom has brought many builders into the market — but experience matters. At Cole Construction, we’ve built our reputation on reliability, communication, and craftsmanship.
We don’t just build ADUs — we create spaces that feel like home.
Local Knowledge
We’ve worked in cities across the Mid-Peninsula — including San Mateo, Menlo Park, Palo Alto, and Redwood City — and understand each city’s zoning and design requirements.
Uncompromising Quality
We use top-tier materials, trusted subcontractors, and detailed oversight to guarantee a result that stands the test of time.
Get Started
Ready to Expand Your Home’s Potential?
Your ADU project deserves a builder who understands design, compliance, and craftsmanship. Let’s create a space that adds value, comfort, and opportunity to your property.