GC General Conditions Calculator

General conditions cover on-site management costs. This calculator sizes monthly and total.

Project hard cost

GC fee %

Construction months

Monthly general conditions

Total GC + GC cost

$740,000

GC fee

$250,000

General conditions

$490,000

How the math works

Total = GC fee ($pct of project) + general conditions (monthly × months). Paid separately from hard cost.

GC fee + GC costs together typically run 15-20% of hard cost. Owners should audit monthly billing against GC's actual site-run costs — budget vs actual divergence is common.

How to Use

Enter project cost.
Enter GC fee %.
Enter construction months.
Enter monthly general conditions.
Read total GC cost.

Frequently Asked Questions

What's included?

Site superintendent. Project manager. Trailer rental. Utilities. Porta-potties. Temporary power. Dumpsters. Cleanup crew. Photography. Signage. Communications.

Typical percent?

8-12% of hard cost for mid-size projects. 5-7% for simpler/shorter. 12-18% for complex or long. Longer timeline = higher GC as % of work.

Negotiating?

Line-item transparency helps. Reduce items (no trailer, share neighboring site). Fixed monthly cap beats open-ended accrual. Competitive bid three or more GCs.

How often should I rerun this?

Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.