General Conditions in Construction Estimates

What do general conditions cover?

The exact list varies by contract, but nearly every general conditions estimate is assembled from the same categories. If a category below is missing from your estimate, it is not free — it is being absorbed somewhere else.

Are general conditions the same as general requirements?

No, and the confusion causes real scope gaps. General requirements are the specification sections in CSI MasterFormat Division 01 — the written obligations the contract imposes on how you run the job. General conditions, in estimating usage, are the costs you carry to meet those obligations and to operate the site. One is a specification, the other is a cost bucket.

There is a third meaning that overlaps in conversation: the general conditions of the contract itself, such as the AIA A201 document, which is a legal instrument defining the rights and duties of owner, architect and contractor. When an owner's representative says "that is covered in the general conditions," ask which one they mean before you price anything.

Separate all of that from home-office overhead. Your office rent, estimating department, accounting staff and business insurance are general and administrative cost, recovered through markup across all jobs. General conditions are attributable to one project and would disappear if that project did not exist. The distinction stops being academic the moment you sign a cost-plus contract, because job-site general conditions are typically reimbursable and G&A is typically not.

Why do general conditions get underestimated so often?

Most sections of a GC estimate are anchored to something you can measure on a drawing. This one is not, and that difference sits underneath the failure modes below.

There is no takeoff to do. Concrete has cubic yards, drywall has square feet, rectangular ductwork has pounds of sheet metal off its surface area and gauge. General conditions has durations and staffing decisions. The quantities come from the schedule and the site logistics plan — two documents that frequently do not exist at bid time, and which the estimator is not the one producing.

It gets priced last, under time pressure. Sub numbers land in the final hours, the estimate has to close, and general conditions becomes the line that absorbs whatever time is left. A number carried forward from the last job is quicker than a rebuild, so that is what happens.

Schedule risk concentrates here. If the job runs two months long, much of your material and subcontract exposure is already fixed by contract. Your superintendent, trailer, toilets, fencing, temporary power and rented lifts all keep running at full rate, whether or not anything is being installed. Volume-driven items such as dumpster pulls are the exception — they taper with production, which is precisely why they belong in a different class in the log. General conditions is the account that bleeds when the schedule slips, which is precisely why pricing it independent of the schedule is indefensible.

Responsibility gaps fall into it. Who supplies the lift the drywall crew needs? Who distributes temporary power past the panel? Who cleans up after the framers? Each trade assumes someone else carries it, and by the time the answer is settled in the field it is a general conditions cost you did not price.

Division 01 gets skimmed, not priced. Specified requirements carry real cost — progress photography, BIM coordination and clash detection, mockups, a required project management platform license, an owner's trailer with specified furnishings, full-time safety personnel, LEED or diversion documentation, third-party commissioning support. These are contractual obligations, not optional overhead, and they are invisible if you only take off the drawings.

Percentage rules of thumb scale backwards. Supervision has a practical floor. One superintendent is one superintendent whether the job is small or large. Any percentage benchmark you inherited was derived from a particular size and duration of job, and it is likely to under-recover on work smaller or slower than the jobs that produced it.

How do you price general conditions as a schedule?

The method is mechanical once you stop treating the section as a single number. Build it as a log, with each line classified by what actually drives its cost.

Get a schedule first, even a crude one. You do not need a resource-loaded CPM schedule to bid. You need start, phase durations, substantial completion and closeout. Sketch it from the sub durations and your own production experience if the owner has not issued one, then write your assumed duration into the bid.

Classify every line by its cost driver. Time-dependent lines are priced as rate times duration: staffing, trailer, toilets, fencing rental, temporary utilities consumption, monthly equipment rental. Event-dependent lines are one-time and priced per occurrence: mobilization, demobilization, temporary power installation, mockups, final clean, dumpster pulls. Quantity-dependent lines follow a measured quantity: fence length, protection area, small tools as a function of labor hours. Value-dependent lines are calculated against cost, not time: bond premium from the surety's sliding-scale rate per thousand of contract value, general liability rated on payroll or revenue, subcontractor default insurance as a percentage of subcontract value, and building permit and impact fees from the jurisdiction's published schedule applied to construction valuation. These have to be recalculated whenever the estimate total moves, which is why they belong in the log with their basis written next to them.

Give every resource its own duration. This is the step that gets skipped. The superintendent may be on site from mobilization through closeout. The project manager may be assigned part-time and taper. The telehandler may be needed for a twelve-week window, not the whole job. Applying one overall duration to every line simultaneously overprices the short items and underprices the long ones, and the errors do not reliably cancel.

Price the tails deliberately. Work starts before production and continues after it. Mobilization, site setup, submittals and long-lead procurement happen before the first trade arrives. Punch list, closeout documentation, O&M manuals, commissioning support, demobilization and final clean happen after production labor has left. During both tails you are burning supervision, trailer, utilities and toilets at nearly full rate with little or no revenue being installed. The closeout tail is a frequent source of general conditions overruns, because the estimate quietly assumed the site closed on the substantial completion date.

Derive the percentage last. Once the log is priced, divide it by a denominator you have defined and then apply consistently — most commonly direct work excluding general conditions, fee and contingency — and label it. A percentage taken against total contract value and one taken against direct cost are not comparable numbers, and comparing across the two is how a benchmark quietly lies to you. Compare it against your own historical jobs of similar size, duration and delivery method. If it is off, find the line that explains the difference. A percentage used this way is a check on your work. Used as an input, it is a guess wearing a number's clothing.

Qualify the duration in writing. On negotiated and private work, state the schedule your general conditions are based on in the proposal — start date, working days, substantial completion, and any assumed shift or access constraints. On competitively bid public work you usually cannot: the contract documents impose the completion date and liquidated damages, and attaching qualifications can render your bid non-responsive. There, the duration is an input you price to rather than assume, so test whether it is achievable before bidding, raise it as a pre-bid question if it is not, and record your internal assumptions in the estimate file where they support a later time-impact claim. If the owner extends the schedule, you want that to be a defined change event rather than an argument about what you should have anticipated.

What in Division 01 should you price before bidding?

Read Division 01 with a pen before the estimate closes. These are the specified obligations that most often carry unpriced general conditions cost.

• Required project staffing — a full-time superintendent, a dedicated safety representative, or an on-site project engineer named as a contract requirement
• Mockups and sample panels, including the cost to build, review, maintain and remove them
• Required project management or document control software the owner mandates you license
• Progress photography, drone documentation, or reality-capture scanning at a stated frequency
• BIM coordination, clash detection and model maintenance obligations, including required staff time
• Temporary facilities the owner specifies for their own use, such as an owner or architect trailer with listed furnishings and utilities
• Testing and inspection responsibility — confirm which tests the contractor pays for and which the owner holds
• Waste diversion, recycling and sustainability documentation requiring sorting, tracking and reporting labor
• Erosion and sediment control installation, inspection at the frequency your construction general permit requires and again after every qualifying rain event, repair within the permit's window after each storm, ongoing maintenance and silt removal, and removal with final stabilization at closeout
• Closeout requirements — as-builts, O&M manuals, attic stock, training sessions, warranty forms and the labor to assemble them
• Site logistics constraints that carry cost: restricted work hours, noise limits, phased occupancy, required off-site parking, flagging or traffic control

How does contract type change what belongs here?

The same physical costs land in different places depending on how you are paid, and the boundary is negotiable on some contract forms.

Lump sum. Everything in the general conditions log is your risk. If the schedule extends for reasons that are not compensable, the extended general conditions come out of profit. This is the case where the schedule assumption and the qualifications attached to it matter most.

Cost-plus and GMP. General conditions are usually reimbursable at cost, listed in an exhibit to the contract. On many cost-plus and GMP forms, anything not named in that exhibit ends up covered by your fee — check how your contract defines the cost of the work rather than assuming either way. The estimating work and the contract negotiation therefore have to match line for line — a cost you priced into general conditions but that the exhibit excludes has silently moved into your fee.

General conditions caps. Owners sometimes cap the reimbursable general conditions amount or the monthly rate. A cap set against a schedule you did not build is a schedule risk transfer. If you accept one, tie it explicitly to the duration it was priced against.

Wrap-up insurance. On an owner-controlled or contractor-controlled insurance program, general liability, excess liability and usually workers' compensation for on-site work are provided by the program, and you are expected to deduct the covered portion from your bid and from your subs' bids. Deduct only what the program actually replaces — auto liability, off-site and yard exposure, tools and equipment coverage and any limits above the program remain yours, as do the deductible or self-insured retention you are asked to carry. Missing the deduction makes you uncompetitive; overdeducting it, or missing the enrollment, certified payroll reporting and program safety administration that comes with it, costs you money and time nobody priced. Missing the deduction makes you uncompetitive; missing the enrollment and administration effort that comes with it costs you time nobody priced.

When is a percentage still the right tool?

There are legitimate uses. Small tools and consumables genuinely track labor hours, so a percentage of self-performed labor is a reasonable method there. Conceptual and budget-stage estimates with no drawings and no schedule leave you nothing to build a log from, and a benchmark drawn from your own completed jobs is better than a fabricated line-item list that implies precision you do not have. If you use one, state the duration and job size it assumes, because that assumption is what someone will later test it against.

The condition is that the benchmark comes from your own job cost history, on jobs of comparable duration, size, delivery method and site difficulty. A percentage borrowed from a published figure, a competitor, or a project that ran on a different schedule is not a benchmark. It is someone else's answer to a different question.

The honest cost of the schedule-based method is time. Building the log from scratch on every bid is rarely realistic inside a normal bid window. The practical fix is a standing template carrying your burdened staffing rates, your standard rental items and your typical event costs, so the per-bid work is entering durations and deleting lines that do not apply rather than rebuilding the structure.

Should you outsource general conditions pricing?

Mostly no, and it is worth being direct about that. General conditions depends heavily on information only you have: your burdened staffing rates, which people are assigned and at what percentage, what equipment you own versus rent, your insurance and bond rates, your safety program, and how long you think the job will actually take. An outside estimator inventing those inputs produces a plausible-looking number with nothing behind it.

What an outside estimator can usefully do is the structural and quantity work around it. Quantities that come off the drawings — site fencing length, temporary protection areas, erosion control, temporary enclosure area, hoisting and access study — are ordinary takeoff. So is reading Division 01 and returning a list of specified obligations with cost implications, which is tedious, frequently skipped, and does not require knowing your rates. So is maintaining the log template itself. Outsourced estimating services, including ours, are well suited to that scope and poorly suited to guessing your superintendent's rate.

The division that works: someone else builds and quantifies the framework, you supply the rates and the durations, and you own the schedule assumption because you are the one who will have to live inside it.