Expertise That Builds Confidence
At Oakhill Engineering, we provide innovative, detail-driven solutions that solve complex challenges and create sustainable, usable spaces for our clients and communities.
Our multidisciplinary team brings together professionals in civil engineering, aquatic design, and land surveying to deliver precise results with a
client-first mindset.
With deep regional knowledge and a commitment to modern best practices, we tailor every project to meet regulatory requirements, environmental constraints, and long-term performance expectations.
WHAT WE BRING
PRECISION
We don’t just meet standards—we help set them. Our work is built on an unwavering commitment to quality and a belief that every detail matters. We approach each project with clarity and care to ensure excellence from start to finish.
INNOVATION
Creative solutions are grounded in proven methodology. Our team embraces emerging technologies and evolving best practices to deliver designs that are both visionary and practical. By blending technical rigor with outside-the-box thinking, we bring new perspectives to every site.
PARTNERSHIP
We believe successful projects begin with strong relationships. That means listening to your needs, collaborating openly, and treating every client with professionalism and integrity. Our approach is personal, transparent, and built on trust.
Mark Mariano, PE CPO
Principal
Mark Mariano, PE, CPO, serves as Principal of Oakhill Engineering, where he leads with a blend of technical expertise and strategic vision. Building on the 65-year legacy of Dyer Surveying, Mark has guided Oakhill’s transformation into a modern, multidisciplinary firm recognized for uniting surveying, civil engineering, and aquatic design under one roof. His leadership emphasizes precision, integrity, and proactive problem-solving—qualities that have earned Oakhill a reputation for delivering streamlined, future-ready solutions across residential, commercial, and municipal projects
The Right Team.
The Right Results.
At Oakhill Engineering, we bring land surveying, civil engineering, and aquatics design together to streamline your project from concept to completion. Our integrated team delivers smart, future-ready solutions with the responsiveness and precision today’s clients expect.
Multidisciplinary Expertise
Oakhill Engineering offers integrated civil engineering, aquatic design, and land surveying
all under one roof. This unified approach eliminates the delays and miscommunications that can happen when coordinating between multiple firms. With our team aligned from day one, we deliver accurate, efficient, and cohesive results across
all phases of development.
Future-Ready Thinking
Every design we deliver is built with
tomorrow in mind. We design our projects to exceed the long-term environmental demands so your investment remains functional, sustainable, and resilient. Our goal is not only to meet today's needs but to create infrastructure and spaces that stand the test of time.
Client-Focused Approach
We believe engineering should be as responsive
as it is reliable. Our clients have direct access to the professionals working on their project, ensuring timely communication and transparency at every stage. Whether answering questions, navigating challenges, or adjusting to new priorities, we remain engaged and solutions-driven from
start to finish.
Seamless Execution, Start to Finish
From permitting to final plans, we handle the complexities so you can focus on your vision. Our streamlined process, deep regulatory knowledge, and proactive problem-solving keep your project moving forward—on time and on target.