Est. 1943 · Northern California
Planning Today.
Building Tomorrow.
Engineering Solutions.
A family-owned civil engineering firm delivering land development, design, and consulting across Northern California for over 30 years — with a deep understanding of local agencies, regulations, and what it takes to get projects built.
Who We Are
Dependable engineering, built on a legacy of local experience.
RAK Civil Engineers Inc., formerly Robert A. Karn & Associates, is a locally based, family-owned firm now led by the Petrini family — whose engineering legacy spans multiple generations. We combine practical experience, innovative design, and modern technology with a commitment to integrity and responsive service.
From feasibility and planning through design, permitting, and construction, our team stays actively involved at every stage — applying sound engineering judgment to help clients navigate complex requirements and keep projects moving forward.
More about the firmWhat We Do
Civil Engineering
Conceptual site planning through permit-ready construction documents — grading, drainage, ADA, utilities, and stormwater.
View service →02Land Planning & Development
Due diligence, feasibility, and entitlement strategy that turns raw sites into buildable, agency-approved projects.
View service →03Construction Administration
Active support through construction — RFIs, submittals, site observation, and closeout — so plans get built as intended.
View service →04Surveying & Mapping
Boundary, topographic, and ALTA surveys, parcel maps, and lot line adjustments through licensed land surveyors.
View service →
In the Community
Rooted in the communities we serve.
We're proud members of our local chambers of commerce and support organizations that strengthen Solano County — including Leaven, which helps local kids succeed.
Chamber of Commerce
Chamber of Commerce
Society of Civil Engineers
Community Partner