Letters of Credit in Construction: When They Stand In for Bonds

A letter of credit (LOC) is a bank's irrevocable commitment to pay a specified amount to a beneficiary on demand if certain conditions are met. In construction, the typical LOC is a standby letter of credit — one that's drawn on only if the contractor fails to perform. If the project proceeds normally, the LOC expires without being drawn.

LOCs substitute for several other security instruments in construction. On some projects, they substitute for performance bonds. On others, they back retention amounts. On closeout, they sometimes secure warranty obligations. For the contractor, an LOC is an alternative to posting cash or relying on bonding capacity — especially useful for contractors with strong banking relationships but limited bonding lines.

How an LOC Works Structurally

An LOC has three parties:

The LOC specifies the amount, the expiration date, and the conditions under which the beneficiary can draw. For a standby LOC securing performance, the condition might be "contractor's default on the referenced contract." The beneficiary presents their draw demand with the required documents (often just a statement that the condition has been met), and the bank pays.

The bank pays the beneficiary and then charges the applicant's account or draws on the applicant's credit line. Either way, the contractor bears the ultimate cost — the LOC is security backed by the contractor's own bank credit.

The Demand-Draw Mechanic

The critical feature of a standby LOC is the demand-draw mechanic. The beneficiary can typically draw on the LOC by simply presenting the documents specified in the LOC — often just a written statement that the draw condition is met. The bank pays without investigating the truth of the beneficiary's claim. The contractor has no pre-draw opportunity to dispute whether the condition is actually met.

This is different from a bond, where the surety investigates before paying and may contest the claim. An LOC is essentially self-executing — if the beneficiary presents proper documents, the bank pays, and any disputes about whether the draw was proper happen after the fact (typically requiring the contractor to sue for recovery).

Cost Comparison to Bonds

LOC fees typically run 0.5-2% of the LOC amount per year, depending on the contractor's banking relationship, credit strength, and the LOC's risk profile. A $200K LOC for a strong contractor might cost $1,000-$2,000 annually; for a weaker contractor, $2,000-$4,000.

Bond premiums typically run 1-3% of the bond amount per year. At the lower end of bond premium and the higher end of LOC fees, they're comparable; at the higher end of bond premium and the lower end of LOC fees, LOCs are cheaper.

The real cost difference is the utilization of credit capacity. An LOC ties up the contractor's bank credit line — the bank won't extend the same credit elsewhere while the LOC is outstanding. A bond ties up the contractor's bonding capacity, which is largely independent from bank credit. A contractor with plenty of bonding capacity but tight bank credit is better off using bonds; a contractor with plenty of bank credit but tight bonding capacity is better off using LOCs.

Common Construction LOC Uses

Public Work and LOCs

On US federal public work, LOCs generally don't substitute for Miller Act bonds — the statute requires bonds specifically. Little Miller Act statutes at the state level similarly require bonds. LOCs can't legally fill those roles on public projects.

On private work, LOCs are acceptable wherever the contract allows them. Some owners specifically permit LOCs as an alternative to bonds in their contracts, giving the contractor a choice. Some require only one or the other. Reading the contract to understand what's allowed — and negotiating flexibility where possible — lets the contractor use whichever instrument fits their credit structure better.

Expiration and Renewal

LOCs have expiration dates. A typical construction LOC runs for the contract period plus a tail (say, contract period plus 90 days) to cover draws related to issues discovered during the tail. When the LOC approaches expiration, the contractor (and the beneficiary) have to address whether it gets renewed, extended, or allowed to expire.

For multi-year projects, LOCs typically auto-renew each year with the bank's consent — but the contractor pays the fee annually, and the bank can refuse to renew if the contractor's credit situation has deteriorated. A non-renewal can create a scramble to find replacement security.

Evergreen Provisions

Many construction LOCs include an "evergreen" provision — the LOC automatically renews annually unless the bank gives specific notice of non-renewal (typically 60-90 days before the anniversary). Evergreen LOCs reduce the administrative burden of annual renewal negotiations and give the beneficiary more assurance that the security won't unexpectedly lapse.

The tradeoff for the contractor is that the LOC is harder to terminate. If the underlying contract ends but the beneficiary refuses to release the LOC, an evergreen provision means the LOC keeps renewing and the contractor keeps paying fees. Termination requires either the beneficiary's cooperation or a court order.

Fraud and Wrongful Draw Exposure

Because LOCs pay on presentation of documents without deep investigation, the risk of wrongful draw exists. A beneficiary who fabricates a default claim and presents the required documents can get the bank to pay even when the draw wasn't really justified. The contractor then has to sue to recover.

The fraud exception to the independence principle (the rule that banks pay against documents without investigating underlying disputes) allows courts to enjoin a beneficiary's draw if the contractor can show clear fraud. But the fraud has to be clear — an honest dispute about whether default has occurred isn't enough. Getting an injunction requires moving quickly and demonstrating the beneficiary's bad faith conclusively.

Bottom Line

Letters of credit substitute for bonds, retention, and deposits in construction where the contract allows and the contractor's banking relationship supports it. They're demand instruments — drawable on presentation of specified documents without deep investigation — which means they're strong security for the beneficiary and require the contractor to trust the beneficiary won't abuse the instrument. Costs are often comparable to bonds but utilize bank credit capacity rather than bonding capacity. For contractors whose credit structure favors banks over sureties, LOCs are a useful alternative; for contractors whose situation is reversed, bonds remain the right tool. Knowing which is which is part of financial strategy.