When Darby Construction Services was established in 2018, the objective was to enhance recognition of the Quantity Surveyor role (QS) and expand availability to a skill that was not fully utilized in the U.S. construction market.

Crucial in ensuring that projects are completed within budgetary constraints and that the client’s financial interests are protected, Quantity Surveyors ensure effective cost management, accurate financial reporting, and cost optimization in construction projects. Working closely with Project Managers, Architects, Engineers, Contractors and Clients, the primary responsibilities of a Quantity Surveyor include Cost Estimation, Planning and Control, Procurement, Value Engineering,  Final Accounts and Dispute Resolution.

Donal Sutton and Paul Stanton, Darby’s Principals, were born and educated in Ireland, and earned their bachelor’s degrees in construction-related fields. Donal’s degree focused on Quantity Surveying, while Paul graduated with a degree in Civil Engineering and later became chartered as a Quantity Surveyor. This unique combination of skillsets allows Darby Construction Services to effectively manage projects while providing precise budgets for their clients.

Donal Sutton | Principal

Donal has nearly two decades of experience in all construction industry sectors across Ireland and the U.S. His portfolio highlights include high-end residential, retail and commercial office fit-outs; building infrastructure upgrades; elevator installations; and more than two million square feet of new data center construction. 

Known for his proactive problem-solving skills and attention to detail, Donal can identify and resolve issues with minimal disruption both before and during construction. He understands the importance of maintaining a sharp focus on budget management and client satisfaction while remaining committed to delivering successful project outcomes.

Before joining Darby Construction Services, Donal served as a senior estimator with a major NYC construction firm, taking the lead on large-scale projects from inception to final account. Actively participating in day-to-day project operations included budgeting and trade interviewing/leveling prior to construction; cost management and invoicing during construction; along with final trade and budget reconciliation at closeout. 

Donal holds Honors Degree in Quantity Surveying from Munster Technological University in Cork, Ireland.

Areas of Expertise

Insurance, Contract Management, Procurement, Pre-purchasing, Schedule Management, Cost Management, Risk Management, Budget Management, Project Management

Project Experience

Commercial Office

Hines, Trinity Portfolio – Various Projects

Sesame Street HQ, 1 Lincoln Plaza, NY

Baker Hostetler, 45 Rockefeller Plaza, NY


Lord & Taylor, 424 Fifth Avenue, NY

Loro Piana, 748 Madison Avenue, NY

Reinstein Ross, 21 East 67th Street, NY


Health + Hospitals, 55 Water St, NY

East Orange General Hospital, NJ


Grace Church School, 46 Cooper Square, New York 10003

Stephen Gaynor School, 148 West 90th St, New York 10024

Berkeley Carroll School, 181 Lincoln Pl, Brooklyn, NY 11217


B.S. (Hons) in Quantity Surveying
Munster Technological University Cork, Ireland

Paul Stanton | Principal

A Civil Engineering graduate and a Chartered Quantity Surveyor with 15 years of experience in the New York City construction market, Paul has worked on all phases of construction, from complex preconstruction and conceptual budgeting to careful punch-list completion. His diverse construction portfolio includes retail, residential, hospitality, healthcare, infrastructure upgrades and corporate office space. 

Keenly aware of the challenges that arise during every phase of construction, Paul understands the significance of every project’s preconstruction and budgeting phase. He is approachable in his interactions yet resolute when it comes to quality. Paul will proactively identify and address potential issues early on to mitigate risks and effectively allocate costs for clients. 

With his extensive experience and expertise, Paul also brings a strategic approach to construction projects. He not only ensures budgeting is carefully managed but is also meticulous about planning—from subcontractor selection to design team collaboration to enforcement of safety standards—to achieve successful client outcomes.

Paul holds a B.E. in Engineering Science, Civil Engineering, from the National University of Ireland in Galway, Ireland, and is a certified member of the Royal Institution of Chartered Surveyors.

Areas of Expertise

Contract Management, Procurement, Schedule Management, Cost Management, Risk Management, Budget Management, Project Management

Project Experience

Commercial Office

Hines, Trinity Portfolio – Various Projects

Boston Properties – Various Projects

Hudson Yards – Pharmaceutical Client, NY


Clean Market, 40 Bleecker Street, NY

Reinstein Ross, 21 East 67th Street, NY

Cuyana, 1055 Madison Avenue, NY


ONX Studio, 645 Fifth Avenue, NY

Book Nook, 557 West 59th Street, NY

Cason Latimer Studio, Brooklyn Navy Yards, NY

Professional Credentials/Licenses

Royal Institution of Chartered Surveyors MRICS

New York City Department of Buildings
Licensed Superintendent Site Safety Training (SST) Certification


B.E. in Engineering Science, Civil Engineering National University of Ireland Galway, Ireland