What Are General Conditions
in a Construction Estimate?

General Conditions Defined

General conditions are the project-wide indirect costs a contractor must spend to run a job site — not to install any particular trade's work, but to keep the project itself functioning. Think of them as the management and infrastructure layer wrapped around all the direct work. They exist whether you are running electrical, mechanical, or concrete, and they belong to the project as a whole, not to any line-item trade.

The important distinction is between jobsite cost and home-office cost. General conditions live on the job site: the superintendent who walks the site every day, the trailer where plans are reviewed, the temporary utilities that power the site before permanent systems are live. Home-office overhead — rent on your main office, accounting staff, executive salaries spread across projects — is a separate category entirely.

In MasterFormat, general conditions costs are captured under CSI Division 01, titled General Requirements. Division 01 covers everything from submittals and RFI procedures to temporary facilities, safety programs, and closeout requirements. It is the administrative and procedural backbone of the specification, and the costs associated with meeting those requirements are what estimators call general conditions.

One practical rule of thumb: general conditions scale primarily with project duration and size, not with the quantity of installed materials. A three-month tenant improvement and a three-year hospital build may have very different material volumes, but the hospital carries far more general conditions cost because the superintendent, trailer, and temporary utilities are on the clock for many more months.

What General Conditions Include

Building a general conditions estimate from scratch means going through the project schedule week by week and asking: what site-level resources does the project need this period? The answer falls into four broad buckets.

The first is project staff time. This covers the superintendent charged to the project, the project manager's on-site hours, and any project engineer time dedicated to the job. These are direct labor costs — real people, real wages — but they are indirect to any installed trade. On a large commercial project, site supervision alone can run six figures per month.

The second bucket is temporary facilities. A field office or site trailer is a standard line. So are temporary power and lighting, temporary water service, portable toilets scaled to crew size, and perimeter fencing or hoarding required by the permit or the owner. None of these end up in the finished building, but the project cannot legally or practically proceed without them.

The third area is site logistics: regular dumpster pulls, site cleanup sweeps (often required weekly by spec), hoisting and material handling equipment not allocated to a specific trade, safety program administration, signage, and traffic control where required. These are often underestimated line by line because each feels minor — but they accumulate.

Finally, there are project-wide administrative items: permit fees (depending on contract structure and who holds the permit), surveying and layout at project start, scheduling software license costs for the project duration, and progress photo documentation required by the owner or lender. Some of these are fixed-fee items; others stretch across the schedule.

• Project staff: superintendent, PM, and PE time on site
• Temporary facilities: trailer, power, water, toilets, fencing
• Site logistics: dumpsters, cleanup, hoisting, safety, signage
• Administrative: permits, surveying, schedule software, progress photos

General Conditions vs General Requirements vs Overhead

These three terms are used interchangeably in the field, which creates real confusion when reviewing bids or discussing cost structure. They mean different things, and a precise estimator keeps them separated.

General Requirements refers to Division 01 of the CSI MasterFormat specification. It is the section of the project manual that establishes the administrative and procedural rules the contractor must follow: how submittals are handled, what the RFI process looks like, what temporary facilities must be provided, how closeout is conducted. Division 01 is a specification document — it defines obligations, not costs.

General Conditions, in estimating usage, is the dollar cost of meeting those Division 01 obligations plus the broader cost of running the site. It is the number in the estimate. When a GC writes a line item called "General Conditions — $420,000," that is the quantified cost of all the supervision, temporary facilities, and site logistics described above.

Overhead, in most usage, means home-office overhead: the cost of running the company that is not attributable to any single project. Rent, accounting, business development, executive time, IT — all spread across the revenue base as a percentage. It is a company-level indirect cost, not a project-level one.

Direct vs Indirect Costs

Every construction estimate separates costs into direct and indirect. Understanding which is which matters because they are estimated differently, priced differently, and represent different risks.

Direct costs are the labor, material, and equipment that become the installed work. When an electrician runs conduit, the conduit material, the wire, the fittings, and the electrician's time are all direct costs. They are quantified through the takeoff — measure the lineal feet, apply the unit cost, multiply through. AI takeoff tools like Pilars operate in this layer, reading PDF drawings to extract the quantities that feed direct cost calculations.

Indirect costs are real costs that do not become installed work. General conditions are the project-level indirects. Overhead is the company-level indirect. Bonds and insurance — required for most commercial work — are also indirect costs, priced as a percentage of the contract or a flat fee. None of them show up in the physical building, but all of them must be funded by the contract price.

The practical implication: a takeoff-driven estimate is incomplete until you add the indirect layer. Summing all the trade direct costs gives you the cost of the work; adding general conditions, overhead, insurance, bonds, and profit gives you the bid. Estimators who rush past general conditions build bids that win but lose money when the superintendent's salary hits the books.

• Direct: labor, material, equipment — priced by takeoff quantity
• Project-level indirect: general conditions — priced by duration and scope
• Company-level indirect: overhead — spread as a percentage of revenue
• Both must be added to reach a complete, fundable bid

Typical General Conditions Percentages

The question estimators and owners ask most often is: what percentage of the total project cost should general conditions be? The honest answer is that a range exists — commonly 5–15% of total project cost — but that range is wide enough to be nearly useless as a planning number without context.

Duration is the dominant driver. Because most general conditions items are time-based costs — the superintendent's monthly salary, the trailer rental, the temporary utility bills — a longer project accumulates more GC cost. A six-month retail fitout might carry general conditions at the low end of the range. A three-year hospital or campus development, where the superintendent is on site for years and temporary facilities must be maintained through multiple phases, will carry a higher absolute dollar amount even if the percentage looks similar.

Project complexity and staffing requirements also shift the number. A project that requires a dedicated safety officer, a full-time project engineer, and a quality control manager in addition to the superintendent will carry higher GC than a simpler job of the same size. Remote projects add mobilization and housing costs on top of standard GC items.

This is why experienced estimators build general conditions bottom-up from a project-specific schedule rather than dropping in a flat percentage. Applying 8% to the direct cost total might be close for a typical commercial tenant improvement, but it will overstate GC on a fast simple job and understate it on a complex multi-phase one. Estimate the superintendent weeks, the trailer months, the dumpster pulls, and sum them. The percentage is a sanity check on the result, not the method.

Questions estimators actually ask