General Contractors, Home Remodeling & Skylight Installations
Home Additions In Walnut Creek, CA
Custom Additions Built To Fit Your Life & Style Since 1983
Add More Living Space Without Leaving The Home You Love
Is your Walnut Creek home starting to feel a bit cramped? Whether your family is growing, your lifestyle is changing, or you simply want more space to relax, work, or entertain, Mares & Dow Construction & Skylights is here to help. Since 1983, we’ve been a trusted name in Walnut Creek and across Contra Costa County for beautifully crafted home additions that enhance comfort, functionality, and value.
We specialize in designing and building seamless expansions that reflect your style and complement the unique architecture found throughout Walnut Creek—from classic ranch homes to modern hillside retreats.
Types Of Home Additions We Build In Walnut Creek
From the quiet neighborhoods near Heather Farm Park to the scenic foothills of Shell Ridge, every home in Walnut Creek has its own character, and every family has unique needs. That’s why we tailor every addition to fit both your lifestyle and your lot. Our full-service design-build team manages the project from start to finish, making the process smooth and stress-free.
We specialize in:
Primary Suite Additions – Create a relaxing, private escape with spacious layouts, luxury bathrooms, and custom features
Accessory Dwelling Units (ADUs) – Whether for aging parents, rental income, or visiting guests, our ADUs are built to comply with Walnut Creek zoning and California state guidelines
Second-Story Expansions – Add space without taking up yard room—ideal for growing families or homes with a view
Garage Additions & Conversions – Add a new garage or transform your existing one into a home gym, office, or rental-ready studio
Why Walnut Creek Homeowners Choose Mares & Dow Construction & Skylights
We’ve proudly served homeowners throughout Walnut Creek for over four decades. From Broadway Plaza to the Diablo Foothills, we bring a deep understanding of local building codes, architecture, and lifestyle needs.
Here’s why our clients keep coming back and referring friends:
40+ Years of Local Experience – Trusted in Walnut Creek and the East Bay since 1983
All-in-One Design/Build Services – One streamlined team managing everything from planning to construction
Superior Workmanship – Premium materials and detail-driven execution
Sustainable Solutions – Energy-efficient options including windows, insulation, and eco-conscious construction practices
Hands-Off Project Management – We handle permitting, inspections, and timelines so you can focus on enjoying the process
Take a look at our Residential Project Portfolio to see examples of our custom additions across the Bay Area.
Seamless Design, Flawless Execution
Whether you’re adding upward, outward, or creating a fully detached ADU, we take care of every detail—design, materials, permits, and final walk-through. Our goal is to make your home addition experience efficient, enjoyable, and rewarding from day one.
Visit our About Us page to learn more about our company’s mission and values.
Ready To Expand Your Home In Walnut Creek?
Stop searching for a “home addition contractor near me.” Trust the team that has been serving Walnut Creek for over 40 years. Contact Mares & Dow Construction & Skylights today to schedule your free consultation and get started on the home expansion you’ve been dreaming of. Get in touch today!
based on 
