What a General Contractor Actually Does, and When You Need One

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A general contractor manages the people, materials, permits, and schedule for a construction project, but rarely swings a hammer themselves. Their job is coordination: hiring and supervising subcontractors, ordering materials, scheduling inspections, and making sure the electrician isn’t showing up before the drywall is finished. For a homeowner, the value is not in the labor. It’s in not having to manage twelve different vendors and a permit office by yourself.

The actual daily work

On a mid-size renovation, a general contractor’s week looks less like construction and more like project management. They walk the site two or three times, check that framing matches the plans, confirm the plumber has the right rough-in measurements before drywall goes up, and call the building inspector to schedule the next required inspection. They track a budget spreadsheet, adjust for change orders (a client deciding to move an outlet costs $75 to $150 in most markets, and it adds up), and handle the paperwork that keeps a project legal.

They also absorb scheduling risk. If a tile order gets delayed three weeks, a good contractor shifts other trades around so the whole job doesn’t stall. If a subcontractor no-shows, the contractor finds a replacement instead of the homeowner scrambling to find a plumber on a Tuesday afternoon.

When you actually need one

Not every project needs a general contractor. A bathroom refresh with new paint, a vanity swap, and new fixtures can often be handled by hiring a plumber and a painter directly. The threshold usually shifts once a project involves more than two or three trades working in sequence, or once it requires a permit.

Kitchen remodels involving moved plumbing or gas lines, new electrical circuits, and cabinetry: almost always worth a general contractor.
Room additions or anything touching the foundation or roofline: a general contractor is standard practice, and most jurisdictions require a licensed one to pull permits above a certain project value (often $5,000 to $10,000 depending on the state).
Whole-house renovations: managing this without a contractor means becoming a part-time project manager for six months to a year.
Structural changes, like removing a load-bearing wall: this requires an engineer’s sign-off and a contractor who knows how to sequence temporary shoring, framing, and inspection.
Single-trade jobs (new roof, new water heater, replacing windows): usually cheaper and simpler to hire that specialist directly.

A rough rule some contractors use themselves: if the project involves three or more trades and takes longer than two weeks, coordination costs more in stress and delays than a contractor’s fee would.

How they get paid and what that means for cost

General contractors typically charge in one of three ways: a flat fee for the whole project, cost-plus (materials and labor costs plus a percentage, usually 10% to 20%), or time and materials for smaller or less-defined jobs. On a $50,000 kitchen remodel, a 15% markup means roughly $7,500 goes to the contractor’s overhead and profit, on top of what subcontractors and materials cost.

That fee isn’t padding. It covers liability insurance, workers’ compensation coverage for anyone they employ directly, the time spent managing the schedule, and the risk they take on if something goes wrong. A contractor who quotes suspiciously low, say 5% over cost, is either inexperienced, underinsured, or planning to make up the difference somewhere else, often through change orders later in the project.

Get at least three bids for any project over $10,000. Compare them on scope, not just the bottom-line number. A $42,000 bid and a $48,000 bid might look different until you notice one includes permit fees and dumpster rental and the other doesn’t.

Vetting one before signing anything

Licensing requirements vary by state, and some states (like Missouri) don’t require a general contractor license at all, which makes vetting more important, not less. Check for:

A current license number, verifiable through the state licensing board’s website.
General liability insurance and workers’ compensation coverage, with certificates provided directly by the insurer, not just a photocopy from the contractor.
At least three references from projects completed in the last two years, ideally similar in scope to yours.
A written contract specifying start and completion dates, payment schedule tied to milestones (not just calendar dates), and a defined process for change orders.

Avoid any contractor who asks for more than 10% to 30% upfront before work begins (state law caps this in some places, including California at 10% or $1,000, whichever is less). Payment should follow progress: a deposit, then payments tied to completed phases like framing, rough-in, and final walkthrough.

What good communication looks like

A contractor worth hiring sets expectations early: a written schedule with rough dates for each phase, a clear point of contact if something goes wrong on site, and regular updates, whether that’s a weekly walk-through or a shared project app. Delays happen on almost every project, material lead times shift, inspectors get backed up, weather interferes with exterior work. The difference between a good contractor and a bad one is usually not whether delays happen, but whether you hear about them before or after they cause a problem.

Ask upfront how they handle change orders in writing, how often they’ll update you, and who physically supervises the site day to day. If the answer is “I’ll swing by when I can,” that’s worth weighing against a contractor who has a dedicated site supervisor or project manager on jobs over a certain size.

If you’re weighing whether to hire one, start by listing every trade your project will require and every permit it will need. If that list runs past two trades or includes anything structural, electrical panel work, or gas lines, call three licensed general contractors this week, ask for itemized bids, and check their license status before any conversation about price.