Construction Bond Cost Calculator

Performance/payment bonds are standard for public + many private projects.

Contract value

Performance bond %

Payment bond %

Bid bond %

Total bond premium

$128,000

Performance bond

$80,000

Payment bond

$40,000

How the math works

Total = contract × (performance + payment + bid) %.

$8M × (1.0% + 0.5% + 0.1%) = $128,000 total bond premium.

How to Use

Enter contract value.
Enter performance bond %.
Enter payment bond %.
Enter bid bond %.
Read total bond premium.

Frequently Asked Questions

Bond premium structure?

Premium: 0.5–3.0% of contract value, paid by GC, passed to owner. Tier rating: A-rated GC ~0.6–1.2%, B-rated 1.5–2.5%, C-rated 2.5–3.5%. Public projects (Miller Act federal, Little Miller state): performance bond + payment bond required for >$100k contracts. Private: 50–80% of large commercial. Bond premium not refundable, regardless of project completion. Surety company assesses GC financials, project complexity, completion history, work-in-progress backlog.

How does this impact project budget?

Construction budgets layer hard costs (50–65%), soft costs (15–25%), financing (5–10%), contingency (5–10%), and developer fee (3–5%). Schedule risk often equals or exceeds cost risk — every month delay carries carry cost (interest, real estate tax, insurance, opportunity cost) of 0.5–1.5% of project budget. This calculator quantifies one cost component.

Owner-controlled vs GMP vs CM-at-risk?

Lump sum/GMP: contractor takes risk above guaranteed maximum price, owner pays for change orders. CM-at-risk: open book, fee + GMP, more transparent. Construction management: agent for owner, GC subcontracted directly. Design-build: single accountability, faster but less price competition. Match delivery method to project complexity and owner sophistication.

Schedule and cost contingency?

Standard contingency: 10% of hard cost for entitlement, 5–8% for construction. Schedule contingency: 60–90 days buffer past target completion. Force majeure provisions: weather, material lead time, labor strike, permit delay. Track via critical path method (CPM) schedule. Major lender draws contingent on schedule + cost variance to budget remaining within 5%.