A general contractor holds the trade contracts, bids or negotiates a price for the finished design, and bears the cost and schedule risk of delivering it. A construction manager, in the most common form, oversees that process on the homeowner’s behalf without holding the trade contracts or bearing that risk directly, working for a fee instead.
There’s a second construction manager model worth knowing about too: construction manager at risk, where the CM eventually takes on the contractor role and the financial risk that comes with it. This guide covers how these roles actually differ, how each is paid, and which one fits a Hamptons luxury project.
Key Takeaways
- A general contractor holds the subcontractor contracts, bids or negotiates a price for the finished design, and is incentivized by the project’s outcome since their fee is typically built into that price.
- An agency construction manager oversees the project on the homeowner’s behalf without holding the trade contracts or bearing construction risk directly, charging a fee for that oversight instead.
- Construction manager at risk is a separate model where the CM acts as a paid consultant during design, then converts into the contractor role during construction, providing a guaranteed maximum price and holding the trade contracts.
- Fee structure reflects risk: an agency CM’s fee is typically lower and fixed, since they carry no construction risk, while a GC’s or CM at Risk’s fee accounts for the risk they’re taking on.
- A general contractor typically isn’t brought in until after the design is complete; a construction manager, in either model, is more likely to be involved earlier, during design and pre-construction.
- On some Hamptons projects, a single firm handles both design-build and construction management functions, but the roles stay conceptually distinct even when held by the same company.
The Core Difference: Who Holds the Risk
The clearest way to separate these roles is by risk and contract structure, not job title. A general contractor holds the subcontractor agreements and is financially on the hook for delivering the bid price. Construction management oversight, in its most common agency form, works differently: the CM directs and monitors the work but doesn’t carry that financial exposure.
A third model, construction manager at risk, sits between the two. The table below breaks down how all three compare.
| Model | Who Holds Trade Contracts / Risk | Typical Fee Structure |
| General Contractor | The GC holds the contracts and bears cost and schedule risk on the bid price | Built into the lump-sum or negotiated price |
| Agency Construction Manager | The owner (or a GC) holds the contracts; the CM carries no construction risk | A fixed fee for oversight services |
| Construction Manager at Risk | The CM holds the contracts once construction begins and bears risk above the guaranteed maximum price | A fee plus contingency reflecting that risk |
Construction Manager as Agency: Pure Oversight
An agency construction manager represents the homeowner’s interests exclusively, without holding the trade contracts or bearing construction risk. The owner, or a separately hired general contractor, holds those contracts and does the actual building, while the CM directs the schedule, reviews quality, and manages the budget on the owner’s behalf.
Because an agency CM has no financial stake in the construction outcome, their fee is generally lower than a GC’s built-in profit margin. Selection also tends to happen differently: an agency CM is chosen for expertise and fit rather than through competitive bidding, since there’s no lump-sum price to compare.
Construction Manager at Risk: A Hybrid Model
Construction manager at risk starts differently. The CM is engaged as a paid consultant during design, providing input on scheduling, pricing, and constructability while the architectural plans are still being developed. Once the design reaches a defined point, the CM converts into the contractor role and provides a guaranteed maximum price.
From that point forward, the CM holds the trade contracts and takes on financial responsibility much like a general contractor would. If the final cost exceeds the guaranteed maximum price on covered scope, the CM absorbs the overage rather than the homeowner, which is the defining tradeoff of this model.
How Fees Differ Between the Two
A general contractor’s fee is rarely broken out as a separate line item, since it’s built into the total bid or negotiated price. An agency CM’s fee is typically visible and separate, calculated against project cost or as a flat rate for oversight, and it doesn’t need to account for the pricing built from the underlying cost breakdown the same way a contractor’s bid does.
A construction manager at risk’s fee sits in between, since it has to account for the contingency needed to cover potential overages above the guaranteed maximum price. That contingency is what makes CM at Risk fees closer to a general contractor’s total cost than an agency CM’s fee, even though the oversight function looks similar on paper.
Which One Fits a Hamptons Luxury Project
For homeowners who want independent oversight without the CM also carrying construction risk, the agency model is the more common fit, particularly when paired with an already-selected general contractor or design-build team.
Construction manager at risk makes more sense when a homeowner wants both pre-construction input and a guaranteed price locked in before the design is finalized. Either way, the right fit depends less on the title and more on how professional construction oversight is actually structured for a specific project, which is worth confirming directly with any firm before signing.
Things to Know
- The term construction manager alone doesn’t specify agency vs. at risk; it’s worth asking directly which model a firm is proposing before comparing fees.
- A guaranteed maximum price under CM at Risk caps what the owner pays for covered scope, but doesn’t cover items outside that scope, like owner-directed upgrades.
- An agency CM is selected primarily for expertise and fit, since there’s no bid to compare; a GC is often compared through competitive bidding.
- Combining a CM and a GC on the same project is possible, but requires clear coordination so the two aren’t working at cross purposes.
- A general contractor’s fee is rarely broken out separately since it’s built into the total price; an agency CM’s fee is typically a visible, separate line item.
- Because an agency CM has no construction risk, some homeowners pair one with an owner’s representative for an added layer of independent oversight.
Frequently Asked Questions
Is a construction manager more expensive than a general contractor?
Not necessarily; an agency construction manager’s fee is often lower than a general contractor’s built-in profit margin, since the CM isn’t bearing construction risk.
A construction manager at risk changes that comparison, since their fee reflects the risk of guaranteeing a maximum price, which can make the two closer in total cost depending on the project.
Can a construction manager also act as the general contractor?
Yes, under a construction manager at risk arrangement, where the CM acts as a paid consultant during design and then converts into the contractor role once construction begins.
In that model, the CM eventually holds the trade contracts and bears financial risk the same way a general contractor would, which is different from a pure agency CM role that never takes on that risk.
Who actually builds the project if I hire a construction manager?
It depends on the model. Under an agency CM, the owner or a separately hired general contractor holds the trade contracts and does the actual building, while the CM oversees. Under CM at risk, the construction manager itself becomes the contractor of record.
This distinction is worth clarifying directly with any firm before signing, since “construction manager” alone doesn’t specify which structure is being proposed.
Does a construction manager compete for the job through bidding?
An agency construction manager is typically selected based on qualifications and fit rather than competitive bidding, since there’s no lump-sum price to compare.
A general contractor, by contrast, is often chosen through bidding on a completed design, which is one reason the two roles get evaluated so differently during hiring.
Do I need both a construction manager and a general contractor?
Not usually, since an agency construction manager and a general contractor can fill overlapping oversight functions.
Some large projects do use both, an agency CM providing independent oversight while a separately hired GC builds, but this requires clear coordination so the two aren’t duplicating or contradicting each other’s direction.
Matching the Role to How You Want Your Project Run
Whether a general contractor, an agency construction manager, or construction manager at risk fits your project comes down to how much oversight you want, who you want holding the risk, and how early you want that role involved.
Hamptons Luxury Design + Construction provides construction management across Southampton, East Hampton, Sag Harbor, Water Mill, and the surrounding villages, working alongside architects, designers, and specialty contractors on luxury home construction, renovation, and remodeling projects. A conversation about your specific project is the most reliable way to see which structure actually fits.
