Retention Bond

Cash retention is a common feature of construction and major works contracts in European public procurement. A contracting authority typically withholds a percentage of each interim payment, often between 3% and 10%, as security against defects that may emerge after completion. A retention bond allows the supplier to replace that withheld cash with a financial guarantee, releasing the retained funds back to the supplier while preserving the authority's right to financial recourse if defects are not remedied.

What is a Retention Bond?

A retention bond is structurally similar to a performance bond but serves a distinct purpose. Where the performance bond covers risk during the execution phase of the contract, the retention bond specifically protects the contracting authority's interest during the defects liability period after practical or substantial completion. The bond value mirrors the cash that would otherwise be withheld.

Under the standard two-stage retention mechanism used in most European construction contracts, the full retention percentage is withheld during the works phase, then released by half on practical completion. The remaining half is held through the defects liability period, which typically runs for 12 months. A retention bond can be used to release either or both tranches depending on the contract conditions.

From the supplier's perspective, cash retention represents working capital that is tied up and earning nothing. On a large contract, withheld cash can run into hundreds of thousands of euros. A retention bond replaces this with a contingent liability on a bank or surety, freeing the cash for working capital or investment. The net cost, being the bond fee, is typically lower than the cost of financing the withheld cash.

The use of retention bonds in European public procurement is encouraged by industry bodies but is not universally mandated by law. In the UK, retention reform has been debated for several years, and the Construction Industry Council and major contractors' associations actively advocate for mandatory retention reform. Retention bonds have been discussed as a mechanism to protect subcontractors in insolvency scenarios. Bidders operating in the UK public works market should monitor this evolving landscape.

On the EU side, Directive 2014/24/EU does not prescribe retention terms but does require that payment conditions be proportionate and commercially reasonable, which gives suppliers a basis to negotiate against excessive retention rates.

Why it matters for bidders

For suppliers on multi-year construction or infrastructure contracts, retention bonds can materially improve cashflow. The bond fee is usually substantially less than the financing cost of the withheld cash, particularly at current interest rates. However, the bond must be in place before the cash is released, meaning the bank or surety must be engaged early. Suppliers with strong financial standing will find retention bonds easier and cheaper to arrange.

Example

A Swedish municipality awards a school construction contract worth EUR 5 million. The contract provides for 5% retention, meaning EUR 250,000 is withheld cumulatively across interim payments. On practical completion, the contractor provides a retention bond for EUR 125,000 (the second half of retention held through the 12-month defects period) and the municipality releases the corresponding cash. After 12 months, if no defects are outstanding, the bond is released.

Frequently Asked Questions

Is a retention bond the same as a maintenance bond?

They are closely related but not always identical. A maintenance bond (sometimes called a defects liability bond) specifically covers the period after practical completion during which the contractor is obliged to remedy defects. A retention bond is the instrument that replaces withheld cash during that same period. In many contracts, they function identically. Bidders should read the contract conditions carefully to understand exactly what instrument is required and when.

Can a contracting authority refuse to accept a retention bond and insist on cash retention?

Yes, unless the contract conditions specifically permit or require the alternative. Whether a retention bond is acceptable is a contract-specific decision. Some public authorities have standard form contracts that do not contemplate retention bonds, particularly outside the construction sector.

What happens if the contractor goes insolvent during the defects period?

If the contractor becomes insolvent before remedying defects, the contracting authority calls the retention bond for the value needed to engage another contractor to complete remedial works. The surety or bank pays out, and the authority uses the funds accordingly. If remedial costs exceed the bond value, the authority is an unsecured creditor of the insolvent estate for the balance.