FREE CALCULATOR
General Conditions Cost Calculator for Commercial Contractors
General conditions for a construction project are calculated by adding all project-level indirect costs — supervision, site management, temporary facilities, utilities, insurance, permits, security, clean-up, and small tools — then multiplying monthly recurring costs by the estimated project duration and adding any one-time costs. The total is your general conditions budget.
Estimate your total project general conditions before you bid. Know what site management, supervision, temporary facilities, insurance, and project overhead will actually cost — so your quote starts from the right basis.
Project Duration
Monthly Recurring Costs
One-Time Costs & Markup
Contract Value
Results
Enter project duration and at least one monthly cost to see results.
Formula
Total GC = (Monthly recurring costs × Project duration) + One-time costs + Contingency
Monthly GC = PM/Superintendent + Site Office + Utilities + Insurance + Security + Clean-Up + Small Tools
Total GC = (Monthly GC × Duration) + Permits & Licenses
GC Per Day = Total GC ÷ (Duration × 22 working days)
Contingency = Total GC × (Markup % ÷ 100)
Grand Total = Total GC + Contingency
Commercial Contractor Example
A commercial electrical contractor is bidding an 8-month, $1,200,000 office building project. They need to estimate general conditions before submitting the quote.
Project Inputs
Additional Costs
General conditions breakdown:
Monthly GC
$18,200
Total Project GC
$152,100
Contingency (8%)
$12,168
Grand Total GC
$164,268
GC Per Day
$864.20
GC as % of Contract
13.7%
Status
Watch
Monthly recurring costs of $18,200 over 8 months plus $6,500 in one-time permits gives a base GC of $152,100. With an 8% contingency, the grand total GC budget is $164,268 — 13.7% of the $1.2M contract value. This is in the Watch range. Review whether site costs or duration can be optimized before bidding.
Why This Matters
General conditions underestimation is one of the most common causes of bid margin loss.
Time-based support costs compound quietly. Every month on site, supervision, temporary facilities, security, insurance, and utilities drain margin that was never properly accounted for in the original estimate.
Spreadsheet estimating often misses or understates these items. A single missed line item — like site security or waste removal — multiplied across months of duration can erase thousands from the bottom line.
This tool helps establish a better pricing basis before the quote is sent. Get the GC right, and every downstream decision — floor price, margin target, change order thresholds — starts from a stronger position.
What Costs Belong in General Conditions
Supervision & Site Management
Project manager, superintendent, and site engineer costs. These are project-specific roles that exist only because this job exists.
Temporary Facilities
Site offices, storage containers, temporary power and water, restroom facilities, and break areas required to operate the job site.
Insurance & Bonds
Project-specific insurance policies, performance bonds, payment bonds, and liability coverage required by the contract.
Permits & Licenses
Building permits, trade permits, environmental permits, and regulatory fees. Typically one-time costs incurred at project start.
Security & Fencing
Site perimeter fencing, security guards, cameras, lighting, and access control for the duration of the project.
Clean-Up & Waste Removal
Daily site cleaning, dumpster rental, construction waste hauling, and final cleanup before handover.
Small Tools & Consumables
Hand tools, power tool consumables, PPE, fasteners, adhesives, and other materials not tracked as direct job cost.
Utilities & Communications
Temporary electricity, water, internet, phone lines, and radio communication systems for site operations.
General Conditions vs. Company Overhead
General Conditions (Project-Level)
Costs that exist because a specific project exists. If the project goes away, these costs go away. Examples: site superintendent salary, temporary fencing, project-specific insurance.
These are estimated per project and included in the bid. The longer the project runs, the higher the total general conditions.
Company Overhead (Business-Level)
Costs that exist whether or not this specific project happens. Office rent, accounting, marketing, owner salary, truck payments. These continue regardless of project volume.
Overhead is recovered across all projects through markup or allocation. A separate overhead calculator handles company-level recovery planning.
Key distinction: General conditions are project indirect costs. Overhead is company indirect costs. Both need to be covered in your pricing, but they are calculated and managed differently.
Why Project Duration Changes Everything
Most general conditions costs are time-based. The project manager earns the same salary whether the job finishes in 6 months or 10 months. Site rent, security, utilities, and insurance all compound with every additional month on site.
This means duration is the single biggest driver of total general conditions cost. A project that runs two months longer than planned can add $30,000 to $80,000 or more in general conditions — costs that were not in the original bid and may not be recoverable.
This is also why general conditions and delay costs are closely linked. If a project is delayed, the extended duration extends the general conditions burn. A delay cost calculator can help estimate the incremental impact of extended general conditions during a delay period.
Practical takeaway: When estimating general conditions at bid time, be realistic about duration. Building in a small buffer is better than underestimating and watching margin drain month by month.
Frequently Asked Questions
What are general conditions in construction?
General conditions are the project-level indirect costs required to manage and support a construction job. They include supervision, site management, temporary facilities, insurance, permits, security, clean-up, and small tools — costs that exist because a specific project exists but are not tied to any single trade or scope item.
How do you calculate general conditions for a project?
Add up all monthly recurring costs such as supervision, site office rental, utilities, insurance, security, clean-up, and small tools. Multiply the monthly total by the estimated project duration in months, then add any one-time costs like permits and licenses. The result is the base general conditions budget.
What costs are included in general conditions?
Typical general conditions include project manager and superintendent costs, temporary facilities and site offices, utilities and communications, insurance and bonds, permits and licenses, security and fencing, clean-up and waste removal, and small tools and consumables. Each of these is a project-level cost that would disappear if the project were cancelled.
What is the difference between general conditions and overhead?
General conditions are project-level indirect costs that exist because a specific job exists — site supervision, temporary facilities, permits, and site security. Overhead is company-level costs that continue regardless of any single project — office rent, accounting, marketing, and owner salary. Both need to be recovered in your pricing, but they are estimated and managed separately.
Should general conditions include contingency?
Yes. Adding a contingency buffer to your general conditions budget covers schedule risk, unforeseen site costs, and estimation uncertainty. A common approach is to apply a percentage markup, typically 5 to 10 percent, to the base general conditions total. This buffer protects bid margin if the project runs longer or site costs increase above the original estimate.
How do general conditions affect bid margin?
General conditions directly reduce bid margin because they are indirect costs that must be covered before profit. Underestimating supervision, site facilities, or project duration causes the actual general conditions to exceed the budget, which erases margin dollar for dollar. Accurately estimating general conditions at bid time ensures the quote starts from a realistic cost basis and protects the profit built into the bid.