What overhead is: the cost of existing, even with no project running

Ask a contractor how much a project costs and you get an answer right away: materials, labor, subs. Ask how much it costs to keep the company open in a month with no project closed, and there is silence. That cost has a name: overhead. It runs every month, with or without work, and it is the first thing to disappear from the estimates of anyone who does not measure it.

Direct cost and overhead are not the same thing

Direct cost is what belongs to a specific project: the materials for that house, the labor of that crew, the subcontractor for that job. If the project does not exist, the direct cost does not exist. Overhead is the opposite: it exists regardless of the project. It is the cost of having a company, not of running a project. Confusing the two is where a bad estimate starts.

What makes up your overhead

In residential construction, overhead usually includes:

• Fixed structure: office or warehouse rent, utilities, phone and internet.
• Company insurance: general liability, vehicle insurance, umbrella and builders risk.
• Vehicles: vans, fuel, maintenance and fleet depreciation.
• Administrative: accounting, management software, estimating tools, the salary of whoever runs the office.
• Marketing and sales: website, ads, time spent estimating jobs you do not always win.

The most common mistake: forgetting your own salary

The item most often left out is the owner's time. You spend hours estimating, invoicing, buying materials and selling. That work has value, and when it is not included in overhead, the company looks leaner than it is, prices come out low and the owner ends the year exhausted and without profit. Put your own administrative salary into overhead. If you do not pay yourself for office work, someone is profiting from your time, and it is not you.

How much overhead is in a small construction business

The typical overhead range in construction is between 25% and 40% of revenue. Small construction businesses usually fall between 25% and 35%; those working from a home office can get close to 20%. The old industry standard, known as "10 and 20", assumes 10% overhead and 20% profit, but in practice small companies have real overhead above 10%, and that difference is exactly what eats the profit of anyone using the wrong number.

How to calculate your overhead rate

The math is simple and you can do it with one year of numbers:

• On revenue: annual overhead ÷ annual revenue. Example: US$180,000 in overhead ÷ US$600,000 in revenue = 30%. You build 30% into every estimate.
• Per project: annual overhead ÷ number of projects in the year. Example: US$60,000 ÷ 30 projects = US$2,000 of overhead per project.
• On direct cost: annual overhead ÷ direct costs for the year, which gives a rate to apply to the cost of each job.

Any of the three works, as long as you use one consistently. What matters is that no estimate goes out without its share of overhead built in.

Missing overhead is missing profit

Every dollar of overhead you do not build into the price comes out of somewhere, and that somewhere is your profit. A construction business that spends US$40,000 a year on insurance and does not include it in its estimates is paying to work. Measure overhead once, turn it into a rate and apply it every time. That is the difference between a company that covers the cost of existing and one that finds out, at the end of the year, that it worked all year to pay bills that never showed up in the price.

Fixed overhead and variable overhead

Not all overhead behaves the same way. Fixed overhead does not change with project volume: rent, insurance, software, accounting. You pay the same with one project or ten. Variable overhead follows activity: fleet fuel, extra administrative hours, commissions. Understanding the difference helps with two decisions. First, it shows your break-even point, meaning how much you need to bill just to cover fixed overhead before thinking about profit. Second, it avoids the illusion that growth dilutes every cost: part of your overhead grows with you.

The risk of growing without measuring overhead

Many contractors discover overhead the hard way: by growing. Doubling the number of projects usually requires another van, another office person, more insurance, more software. If prices were set with the overhead rate of the small company, the larger company bills twice as much and earns less, because overhead went up and prices did not keep pace. It is the classic "the more work, the less is left".

That is why overhead needs to be measured again at every jump in size. Reviewing the rate once a year, and whenever the structure changes, keeps the price tied to the company's reality. Overhead is not a number you calculate once and forget: it is a snapshot that needs updating whenever the company grows.

Miriam Matos

Founder of FourRise Consulting. Business owner with direct experience in the US construction industry and creator of the F.O.U.R. Method.