What Does a General Contractor Actually Do That a Construction Manager Doesn't?

"GC" and "CM" get used as if they're two words for the same job, and on some projects they basically are. On others, the difference decides who's actually holding the contract risk and who's just managing the process around it, which is not a small distinction when a project goes over budget.

The General Contractor Holds the Contract

A general contractor typically holds a single lump-sum or unit-price contract directly with the owner, self-performs some scope, and subcontracts the rest. The GC is financially on the hook for delivering at the agreed price regardless of what their actual costs turn out to be, which is the defining feature of the role.

A Construction Manager Can Mean Two Very Different Things

"Construction manager" covers two genuinely different arrangements. A CM-agency is a pure advisor: paid a fee, carrying no price risk, with the owner holding all the trade contracts directly. A CM-at-risk is the model where the same firm advises during design and then converts to holding cost risk once a Guaranteed Maximum Price is set. The title alone doesn't tell you which one you're looking at, and the difference is enormous.

Where the Confusion Actually Costs Someone

An owner who assumes their "CM" is holding price risk, when they've actually hired a CM-agency advisor with no skin in a GMP, finds that out at exactly the wrong moment, usually when costs run over and there's no one contractually obligated to absorb it. A subcontractor who assumes the GC they've contracted with also built the schedule can be surprised to learn a CM-agency advisor actually set it, with the GC simply executing against it.

The Question That Actually Clarifies It

Whose signature is on the contract for the trade work, and does that party carry cost risk above the number they quoted? That answer identifies the actual role being played, regardless of what title is printed on the business card or the project org chart.

How to Tell Which One You're Actually Working With

• →Whose signature is on the subcontract, the GC or CM's, or the owner's directly?
• →Is there a Guaranteed Maximum Price, and who's responsible for costs above it?
• →Is this party paid a fee for managing the process, or paid to deliver a fixed result?

None of this is about which title sounds more senior. It's about knowing, in writing, who actually absorbs the cost if the number goes the wrong direction.