NEC X4 requires the Contractor to give the Client a guarantee of its performance from its ultimate holding company, so the Client can look beyond the contracting company if that company fails to perform. NEC4 calls it the "ultimate holding company guarantee"; NEC3 called it the "parent company guarantee", and that's still the name most people use.
It applies when the Contractor is a subsidiary. A Contractor with no owning company has nothing to give, so a Client in that position usually looks at a performance bond under X13 instead. X4 is one of the standard NEC secondary Options in both editions.
How X4 works
| Point | NEC4 ECC (X4.1) | NEC3 ECC (X4.1) |
|---|---|---|
| Who gives it | The Contractor's ultimate holding company | The parent company that owns the Contractor |
| Form | As set out in the Scope | As set out in the Works Information |
| Deadline | By the Contract Date or, if not, within four weeks of it | The same |
| Alternative guarantor | The NEC4 subcontract text, at X4.2, allows one from the same group, subject to acceptance | No equivalent clause |
The change from "parent" to "ultimate holding company" matters. In a group with several layers, an immediate parent may be a thin intermediate company. The top company is usually where the financial strength is. If a group wants a different company within it to give the guarantee, it can propose one, and the alternative can be refused if its commercial position isn't strong enough. Check your own form for this.
Timing and what happens if it's late
The clean approach is to have the signed guarantee in hand by the Contract Date. If that doesn't happen, the four-week period applies. A group's board approvals, legal sign-off and execution as a deed can take longer than the team expects, so begin the process at tender stage.
X4 doesn't say that work stops or payment is held back if the guarantee doesn't arrive. Failing to provide it is a breach, and a Client may rely on the termination reason about a substantial failure to comply with obligations, depending on the facts. Read the termination reasons and take legal advice before relying on them.
What to put in the Scope
The form of guarantee has to be in the Scope, because NEC doesn't publish one in the Option. The Client's lawyers normally draft it. A good form covers:
- the guarantor and the Contractor, by their correct legal names;
- what's guaranteed: performance, payment or both;
- any limit, so that it's no greater than the Contractor's own liability;
- how the guarantee survives changes to the contract, including compensation events;
- when it ends;
- the law and the way disputes are handled;
- how it's executed, usually as a deed.
A short example
A fictional group: Harbourline Holdings plc owns Harbourline Regional Ltd, which owns Harbourline Civils Ltd, the Contractor. A Client using NEC4 asks for the guarantee from Harbourline Holdings plc, not Harbourline Regional Ltd. The group would prefer its regional company, because the plc's lenders limit guarantees. Under the NEC4 subcontract wording, it could propose Harbourline Regional Ltd, and the other side could decline if that company's accounts don't show enough strength. On a main contract, agree the guarantor before signing, and write the outcome into the Contract Data or Scope.
What people get wrong
- Ticking the Option but leaving out the form. Without a form in the Scope, the Contractor can't comply, and the parties end up negotiating after award.
- Not diarising the four weeks. Nobody chases it, and the guarantee is still missing when it's needed.
- Using it as a substitute for checks. A guarantee is only as good as the guarantor. Review the guarantor's accounts, not just the Contractor's.
- Forgetting the back-to-back. A subcontract with X4 runs to the main Contractor, not the Client, unless other undertakings say otherwise. See the Engineering and Construction Subcontract guide.
Related guides
- NEC Secondary Options: X, Y, W and Z Clauses Explained
- X5: Sectional Completion
- X6: Bonus for Early Completion
- X7: Delay Damages
- X2: Changes in the Law
- X3: Multiple Currencies
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This guide is general information in our own words, not legal advice. Your contract and its Contract Data always govern. NEC, NEC3 and NEC4 are trade marks of Thomas Telford Ltd; Contract Status is not affiliated with or endorsed by NEC.