Business Details
50+ Years
experience
Your Trusted Construction Partner in Northern California
Founded in 1907, C Overaa is a fifth-generation family-owned construction company dedicated to delivering reliable, high-quality infrastructure solutions. With over 118 years of experience, we specialize in self-performing critical construction phases, ensuring direct control over project timelines, safety, and cost efficiency. Our collaborative approach integrates preconstruction planning, design-build expertise, and sustainable practices to meet client needs across education, healthcare, transportation, and industrial sectors.Recognized for 100+ industry awards, we prioritize innovation, community impact, and environmental stewardship in every project. Our team of 400+ skilled professionals, including 230+ in-house craftworkers, leverages deep local knowledge and proprietary systems to execute complex projects with precision. As a leader in low-carbon concrete and mass timber construction, we are committed to reducing embodied carbon emissions while maintaining structural integrity and cost-effectiveness.
Services
Preconstruction Services
General Contracting
Design-Build
Self-Perform Concrete
Sustainable Construction
Seismic Retrofitting
Mass Timber
Tilt-Up Concrete
Collaborative Delivery
Low-Carbon Concrete
Details
- Year established: 1907
Highlights and features
- We self-perform 230+ craftspeople for direct project control
- 118 years of Northern California infrastructure expertise
- Award-winning sustainable construction practices since 1907
- Proprietary low-carbon concrete systems reduce emissions 30%
- 500+ collaborative delivery projects totaling $1.5B
Associations and certifications
- LEED
- TRUE Zero Waste Program
What people say
Award-winning
118 years experience
Sustainable practices
Collaborative delivery
Reliable results
Services
Preconstruction Services
Our preconstruction services deliver cost certainty and schedule optimization through collaborative stakeholder alignment. We provide design reviews, cost modeling, and procurement planning to maximize value. With a 100% construction contract award rate for preconstruction projects, our self-perform expertise identifies constructability solutions and cost savings.
Self-Perform Concrete
We self-perform structural concrete, tilt-up panels, and site work using proprietary formwork systems. Our 230+ in-house craftworkers execute complex pours with precision, reducing subcontractor dependencies. This capability enables tighter schedule control and quality assurance for critical path activities.
Sustainable Construction
Our sustainability strategy reduces embodied carbon through low-carbon concrete (30% cement replacement), mass timber framing, and material waste reduction programs. We achieve TRUE Zero Waste certification on projects and incorporate renewable energy systems like solar and cogeneration.
Collaborative Delivery
We execute 500+ collaborative projects totaling $1.5B, including design-build, P3, and CMAR delivery methods. Our approach aligns owner vision with technical execution, leveraging $1B bonding capacity and 400+ staff to deliver complex projects on-time.
Seismic Retrofitting
Our seismic retrofitting services enhance structural resilience using advanced engineering techniques. We combine in-house concrete expertise with proprietary reinforcement systems to upgrade existing buildings, ensuring compliance with California's strict seismic safety standards.
People
Danny Aitken
General Superintendent, Self Perform Group
With 40+ years at Overaa, Danny leads the Self Perform Group, solving complex concrete challenges and mentoring craftworkers. His expertise in elevated decks and formwork systems ensures technical excellence across projects.
Kara Overaa Gragg
Vice President, Communications
A fourth-generation family member, Kara drives innovation in project delivery and sustainability. She developed Overaa's Continuous Improvement Training Program and leads marketing efforts for design-build and alternative delivery methods.
Adrian Reyes
Estimator
Adrian specializes in cost modeling and preconstruction estimating, ensuring financial accuracy from project inception. He leverages 118 years of company data to deliver cost-effective solutions for complex infrastructure projects.
Questions
What construction services do you specialize in?
We specialize in preconstruction, design-build, self-perform concrete, seismic retrofitting, and sustainable construction using low-carbon materials.
How long has your company been in business?
C. Overaa & Co. has been family-operated since 1907, with 118 years of Northern California construction experience.
Do you offer sustainable construction solutions?
Yes, we lead in low-carbon concrete (30% emission reduction), mass timber, and TRUE Zero Waste-certified projects.
What geographic areas do you serve?
We operate throughout Northern California, with offices in Richmond and San Jose.
What industries do you work with?
We serve education, healthcare, transportation, water infrastructure, energy, and commercial sectors.
Are you a self-performing contractor?
Yes, we self-perform critical scopes with 230+ in-house craftworkers, ensuring quality control and schedule reliability.
