What Is a Bank Guarantee in Construction?
A bank guarantee is a formal undertaking from a bank, arranged by the contractor, promising to pay the principal a nominated sum on demand if the contractor fails to perform its obligations under the contract. Construction contracts commonly accept a bank guarantee as an alternative to cash retention, because it gives the principal the same security without tying up the contractor’s cash in a trust account for the life of the job.
Key takeaways
- A bank guarantee is a bank’s written, unconditional promise to pay a set amount to the principal if the contractor defaults.
- It is a common alternative to cash retention, letting the contractor keep working capital free instead of having it withheld from progress claims.
- The bank pays out on demand without investigating fault first — that is what “unconditional” means, and why guarantees are also called unconditional undertakings.
- Arranging a guarantee ties up part of the contractor’s own credit facility or cash security with the bank, which charges an ongoing fee.
- A bank guarantee is not the same as a performance bond — a guarantee draws on the contractor’s own credit, while a bond is issued by a surety.
What is a bank guarantee?
A bank guarantee is a written undertaking from a bank stating it will pay a nominated sum to the principal, on demand, if the contractor fails to meet its contract obligations. The principal holds it as security through the contract and often the defects liability period, instead of withholding cash retention from progress claims.
Its defining feature is that it is unconditional — the bank does not assess whether the contractor genuinely defaulted before paying. It pays the stated amount on a valid demand, and any dispute over fault is settled afterwards between contractor and principal.
In plain terms
A bank guarantee is the bank standing behind the contractor’s promise to perform. If something goes wrong, the principal calls the guarantee and the bank pays out first — the argument over fault happens afterwards.
How it works in a construction contract
The amount, timing and release conditions are all set out in the contract itself, so both sides know what triggers a call and when the guarantee comes back.
- The contract sets the guarantee amount, commonly around 5% of the contract sum, split between the construction phase and the defects liability period.
- The contractor arranges the guarantee with its bank before or shortly after signing, then lodges it with the principal.
- The contractor is paid progress claims in full, since the guarantee stands behind the contract instead of cash being withheld.
- If the contractor defaults, the principal can call the guarantee without proving the claim in court first.
- Part is usually returned at practical completion, with the balance released at the end of the defects liability period.
What it costs the contractor
A bank guarantee is a facility the bank provides, not free security. The contractor pays an ongoing facility fee, typically a percentage per annum of the guaranteed amount, and the bank usually requires cash, a term deposit or a charge over other assets as backing — reducing the contractor’s available credit elsewhere. Building that fee into overheads when pricing a tender is worth doing deliberately.
| Security type | Who provides it | Effect on contractor cash flow | Typical cost |
|---|---|---|---|
| Cash retention | Withheld by the principal | Reduces cash on every claim | No fee, but cash tied up until release |
| Bank guarantee | Contractor’s own bank | Full claims paid; bank credit tied up instead | Ongoing facility fee plus security |
| Performance bond | A surety or insurer | Full claims paid; surety carries the risk | Ongoing premium, less security required |
Pricing a guarantee into your tender
Bank guarantee fees are a real, ongoing cost of the job and belong in your priced return alongside preliminaries and margin. My Trade Hub’s tender preparation tools keep your priced Bill of Quantities, rates library and tender documents together, so overheads like a guarantee facility fee are built into the price you submit rather than discovered after award.
Frequently asked questions
Is a bank guarantee the same as a performance bond?
No. A bank guarantee is issued by the contractor’s own bank against its funds or credit. A performance bond is issued by a surety that separately assesses the contractor’s risk and typically ties up less of the contractor’s own capital.
How much does a bank guarantee cost a contractor?
Typically an ongoing facility fee charged as a percentage per annum of the guaranteed amount, plus a requirement to back it with cash or other assets, which reduces the contractor’s available credit elsewhere.
Can a principal call a bank guarantee even if the contractor disputes the claim?
Yes. A bank guarantee is unconditional, so the bank pays on a valid demand without investigating the underlying dispute. The contractor can still challenge the claim afterwards, separately from the bank’s payment.
What percentage of the contract sum is a bank guarantee usually set at?
A common structure is around 5% of the contract sum, often split so half is released at practical completion and the balance is held through the defects liability period.
When does a contractor get a bank guarantee back?
Release is usually staged — part returned at practical completion, with the remainder released once the defects liability period ends and any outstanding defects are rectified.
Why would a principal prefer a bank guarantee over cash retention?
It gives the same security without managing a retention trust account, and payment on a valid demand is generally faster and more certain than chasing funds from a contractor in financial difficulty.
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