Overhead and Profit in Construction: What GCs Actually Mean

A fair overhead and profit margin for a general contractor (GC) has no single answer, because nothing in the standard AIA contracts fixes one. Practitioner sources put commercial net profit at roughly 5-10%, and combined overhead and profit markups at roughly 10-20% depending on size, delivery method and what is billed separately.

This guide explains what overhead and profit each mean, why they are quoted together, and how to judge a number on your own bid. It is part of the construction cost estimating series, and it pairs with the guide to GC markup on subcontractor bids.

What is overhead and profit in construction?

Overhead and profit (OH&P, sometimes written O&P) is the amount a contractor adds to the direct cost of the work to cover running the company and earning a return. It is usually one line in the contract, expressed as a percentage or a fixed fee.

The two parts are different:

• Overhead is the cost of staying in business that cannot be charged to a single job: estimators, project executives, accounting, office rent, software, company-level insurance.
• Profit is what is left after every cost is paid. It rewards the contractor for capital and risk.

Owners often hear "the GC's fee" and assume it is all profit. It is not. A large share of a fee commonly goes to paying for the company that builds the project.

What is the difference between home-office overhead and job-site overhead?

This distinction explains why two bids with different "overhead" percentages can cost the same.

General conditions are job-site overhead. Contracts such as the Georgia and Greenville County school forms price them as a capped lump sum or a monthly or daily rate rather than as a percentage. When you compare bids, make sure each contractor puts the same costs in the same bucket. The construction budget breakdown shows the full structure.

What overhead and profit ranges do sources cite?

The honest answer is that the evidence is thin. Research for this article found no authoritative US benchmark for GC overhead and profit, only vendor blogs and practitioner commentary. The figures below are labeled as such.

These are not audited industry surveys. Gross margin (revenue minus direct job costs) and net profit (what remains after overhead) are different measures, so a 20% gross margin does not mean the contractor keeps 20%.

For a sense of what one owner negotiates, the University of West Florida's CM-at-risk exhibit template shows an overhead and profit fee of 5.5% alongside a 2.5% CM-managed contingency. That is one institution's template, not a market benchmark.

What drives overhead and profit up or down?

Several factors move the number more than the contractor's greed or generosity.

1. Competition. Competitive lump-sum bidding compresses margins. Negotiated work with few bidders tends to carry more.
2. Delivery method. In a lump-sum contract the GC carries the risk of its own estimate, so it prices that risk into the margin. In a cost-plus or GMP contract, the fee is stated separately and the risk differs.
3. Project size. Larger projects spread home-office cost across more revenue, so the percentage can be lower for the same dollars.
4. Complexity and schedule. Hospitals, renovations and fast-track schedules raise staffing and risk, and so raise the fee or general conditions.
5. Market backlog. When contractors are busy, they pick the jobs with better margins.
6. What is billed separately. A contractor who moves staff cost into general conditions can quote a lower fee percentage on paper.

The guide on allowances and lump sums shows how pricing mechanisms land risk on the owner or the contractor.

How do you judge whether a GC's fee is fair?

Do not judge a percentage in isolation. Work through these steps.

1. Define the base. Ask what the percentage is applied to: subcontractor cost only, total Cost of the Work, or total including insurance.
2. Total the fee and general conditions together. Compare contractors on the sum, because they can trade between lines.
3. Check change-order treatment. Confirm the markup rate on additions and what happens on deductions. AIA commentary notes that on a net decrease the contractor keeps overhead and profit tied to the removed work.
4. Look at the contractor's role. A fee that pays for early preconstruction services, scheduling and cost management is worth more than one for pure construction.
5. Compare with at least two other bids or a reference. An independent estimate helps; see who should own the estimate.

Illustrative example: Contractor A quotes a 5% fee on $9,000,000 of Cost of the Work and $450,000 of general conditions. Contractor B quotes a 7% fee on the same cost and $250,000 of general conditions. A: $450,000 + $450,000 = $900,000. B: $630,000 + $250,000 = $880,000. The lower percentage is the more expensive bid by $20,000. All figures are assumptions for arithmetic.

How are overhead and profit treated in allowances and change orders?

Two contract rules surprise owners.

First, under AIA A201 an allowance covers materials and equipment delivered to the site plus taxes, less trade discounts, according to AIA's guide to allowances. Labor, handling, installation, overhead and profit are in the Contract Sum but not in the allowance. So if actual material cost differs from the allowance, the difference is adjusted by change order, and the overhead and profit on the item is already covered elsewhere.

Second, AIA guidance on change orders says a net decrease credits the owner with actual net cost, and the contractor keeps overhead and profit tied to the removed work. Mixed changes figure overhead and profit on the net increase. The form sets no percentage; rates are negotiated.

Does a competitive bid or a negotiated contract produce a fairer margin?

Neither is automatically fairer. They allocate risk and information differently.

In a competitive lump-sum bid, margins are squeezed by the lowest-price process, which is why sources cite a lower net, about 5-8%, for that mode. The risk is that a thin margin leaves little room to absorb mistakes, and the contractor may look for recovery through change orders. In a negotiated or CM-at-risk contract, the fee is stated openly and you can discuss what it covers, but you lose the price discipline of head-to-head competition unless the subcontractor buyout is competitive and transparent.

A practical middle path is to negotiate the fee and general conditions with a shortlist of two or three qualified contractors, then require competitive bids for each subcontract package, with the results open to your team. That gives you a visible fee and market-tested trade pricing.

What should you do before signing?

Ask for the fee and general conditions as separate lines, with the base for each written down. Ask for the markup rule for change orders in the agreement, not in a side email. And decide what you want the fee to buy: if the contractor will manage preconstruction cost and schedule, a somewhat higher fee can be money well spent.

One caveat applies here and nowhere else in this article: margins vary by market and year, and the ranges above are secondary sources. Judge your own bid on a project-specific basis with an experienced estimator.