Garrison Hill
Group
WELCOME
Garrison Hill Group is a Premier Construction Consulting Firm that specializes in helping corporate tenants and landlords efficiently manage office build-outs, renovations, and relocations.
Construction Management & Owners Rep Firm
Garrison Hill Group is a construction consulting firm that specializes in helping corporate tenants and landlords efficiently manage office build-outs, renovations, and relocations. Our team is dedicated to providing expert guidance and support throughout the entire construction process, ensuring that projects are completed on time and within budget.
Our Expertise
At Garrison Hill Group, we offer a comprehensive range of services to meet the unique needs of our clients. From project planning and cost estimation to quality control and vendor management, our team is committed to delivering exceptional construction management solutions.
Project Oversight
Managing construction projects requires meticulous oversight and strategic decision-making. We specialize in budget control and project management to keep your projects on track.
Quality
Control
We prioritize quality control measures to guarantee that the highest standards are met throughout every phase of the construction process.
Vendor Management
Efficient vendor management is crucial for the success of construction projects. Our team excels in vendor selection, negotiation, and oversight to ensure optimal project outcomes.
FF&E
Management
FF&E is crucial for a seamless project delivery. From procurement and vendor coordination to installation and final placement. We ensure that every element aligns with project timelines and design intent.
Timeline Management
Timely project completion is essential for the success of any construction endeavor. Our team is adept at creating and managing realistic project timelines to ensure on-time delivery.
Risk
Mitigation
Identifying and mitigating risks is crucial for minimizing potential disruptions to construction projects. Our experts are skilled in risk assessment and proactive risk management strategies.
About
Dermot J. O'Sullivan
I’ve spent nearly 20 years in commercial real estate and construction, starting as a carpenter and working my way up to leading multimillion-dollar projects as a Director of Design & Construction. Along the way, I’ve learned that successful projects aren’t just about plans and materials, they’re about people, communication, and leadership.
At every stage of my career, I’ve focused on one thing: delivering with precision, transparency, and a relentless commitment to doing things right.
Today, through Garrison Hill Group, I help clients navigate the complexity of office build-outs, amenity spaces, and relocations across NYC and New Jersey. I lead projects from inception to completion, managing design, construction, and everything in between. Clients can stay focused on their business, not the stress of managing construction budgets, timelines, and egos.
Let’s be honest, construction has a reputation. Delays, cost overruns, blame shifting, and a lack of accountability have led many to expect the worst. But it doesn’t have to be that way. I believe that with true leadership, clear communication, and a commitment to doing what’s right, not what’s convenient, we can change that narrative.
What sets me apart? I don’t just coordinate, I lead. I bridge the gap between owners, tenants, brokers, architects, engineers, and contractors to create alignment, eliminate surprises, and drive results.
I believe in doing what’s right, not just what’s easy. That means showing up, communicating clearly, and holding everyone, myself included, to the highest standard. Because at the end of the day, it’s not just about delivering a space. It’s about delivering trust, confidence, and peace of mind.
Ready to Get Started?
Whether you're planning an office build-out, renovation, or relocation, Garrison Hill Group is here to support you at every step of the way. Contact us today to schedule a consultation and take the first step towards successful construction management.