General Contracting
Lump-sum or GMP delivery for commercial interiors, base-building renovations, and mission critical work. We carry the trades, the schedule, and the risk so the client team can stay focused on the business they're moving into.
Serving Manhattan, the outer boroughs, Long Island, Westchester, and Northern New Jersey.
What we cover
Headquarters, regional offices, and floor-by-floor fit-outs for Fortune 500 tenants and private companies. Class A finishes, integrated AV, and a sequence that matches the move-in plan.
Partner-grade interiors with the acoustic, security, and conferencing infrastructure that the work demands. We've delivered for firms across Midtown, Hudson Yards, and Lower Manhattan.
Cultural institutions, foundations, and educational clients. Sensitive work in landmark buildings, programmed around live operations and donor visits.
Wet labs, dry labs, and pilot manufacturing. Stainless casework, fume hoods, lab gas piping, and the cleanliness protocols that the science demands.
Flagship stores, restaurants, and amenity floors. Brand-grade finishes, tight DOB and FDNY coordination, and a turnover date that hits the opening.
Lobbies, elevator modernizations, MEP upgrades, and façade work programmed around occupied tenants. After-hours and phased sequencing are part of the plan, not an emergency.
How we work
Call (212) 947-6441 or email mahenegan@henegan.com. We sit down with you, your architect, and your real estate team to understand the program, the schedule, and the constraints we have to work inside.
Conceptual estimates, value engineering, site evaluation, long-lead identification. We get the budget and schedule honest before the GMP is signed, so the surprises are small and the answer is yes.
Buy out the trades, run the BIM coordination, sequence the work, keep the site safe, hit the milestones. Weekly OAC meetings, real schedule updates, and a superintendent on site every day.
Punch list, commissioning, sign-offs, O&M manuals, warranties, and the documentation your facilities team needs to actually run the space. We don't disappear after substantial completion.
Pricing
Commercial interior fit-outs in NYC today typically range from $150–$250/SF for standard build-outs, $250–$400/SF for premium finishes, and $400–$700+/SF for trading floors, life sciences, or heavy MEP. We size the contingency to match the design maturity and the building.
Permits, controlled inspections, and DOB sign-off coordination are scoped into our GC delivery, never charged as a surprise line item at close-out.
Request a meetingFAQ
Lump-sum works when the design is fully complete and the schedule has float. GMP works when the design is still maturing but the owner wants price certainty with a transparent buyout. Cost-plus works when speed matters more than the budget and the team has aligned incentives. We can run any of the three, we recommend GMP for most NYC interiors because it balances transparency, price certainty, and speed.
Constantly. Most of our work is in occupied Class A office buildings, hospitals, cultural institutions, and base-building landlord environments. We program around freight windows, after-hours noise rules, and live tenants, and we coordinate with building management directly so you don't have to.
We do. Our project team manages permit filings, controlled inspections, special inspections coordination with the expediter, and DOB sign-off at close-out. We'll work with your filing rep or recommend one of ours.
Disciplined and transparent. Every PCO is logged, priced with backup, and reviewed at OAC before execution. Owner-directed scope changes are priced fairly; design clarification we eat where it's reasonable. The goal is no surprises at close-out, what's on the change log is what's on the final account.
Walkthrough, conceptual estimate, and a defended schedule within the same week we sign the pre-construction agreement.
More services
Owner's agent from concept to close-out. Budgeting, scheduling, bid leveling, trade coordination, change order control, and weekly reporting. Your single point of accountability on the build.
Site evaluation, conceptual estimating, value engineering, constructability review, and bid packaging, done early enough to actually influence the design and the proforma.
Federated 3D models, clash detection, 4D scheduling, and trade coordination meetings driven by the model, not by RFIs after the conflict shows up in the ceiling.
