NEC Adjudication, Disputes and Termination

NEC adjudication is the main way to resolve a dispute on an NEC contract: an independent Adjudicator decides, the decision binds the Parties unless a tribunal later changes it, and the contract sets strict timing. Termination is a separate process, with its own table of reasons, procedures and amounts due.

This guide brings both together for the NEC4 Engineering and Construction Contract (ECC), noting where NEC3 differs. It belongs to our main guide to NEC contracts, and the pages in this section go deeper into each part.

Three dispute routes in NEC4

The dispute route depends on which Option W applies. You choose one when the contract is set up.

	Option W1	Option W2	Option W3
Usual use	Where the UK's Housing Grants, Construction and Regeneration Act 1996 doesn't apply	Where the Act applies	Generally on work outside the Act
First step	Senior Representatives	Adjudicator, or Senior Representatives if the Parties agree	A standing Dispute Avoidance Board
Decision by	Adjudicator	Adjudicator	Tribunal, if the matter isn't settled
Final step	Tribunal	Tribunal	Tribunal
NEC3 equivalent	W1, without the Senior Representatives step	W2, without the Senior Representatives step	None

For most UK construction work, W2 is the one you'll meet. The Act gives a party to a construction contract the right to adjudicate whenever it chooses, and W2 is written to fit that.

How NEC adjudication works

Under W2, in outline:

A Party gives a notice of adjudication, briefly describing the dispute and the decision it wants.
The Adjudicator confirms within three days whether it can act.
Within seven days of the notice, the Party refers the dispute and provides its information.
Further information from a Party follows within fourteen days of the referral, unless extended.
The Adjudicator's reasoned decision comes within 28 days of the referral. That can be extended by up to 14 days if the referring Party consents, or by longer if both Parties agree.
Anyone dissatisfied has four weeks after the decision to notify that they intend to go to the tribunal.

The Parties and the contract managers carry on as if the matter weren't in dispute until the decision arrives. The decision then binds them as a contractual obligation, unless and until the tribunal revises it. If nobody notifies dissatisfaction in time, it becomes final.

The Adjudicator has strong powers. It can look again at what the Project Manager or Supervisor did, or failed to do, on the disputed matter, and can change something that has been treated as accepted.

Time limits are where people lose

Under W1 there are real time bars. Miss a stated time for notifying or referring, and neither Party can take the matter any further. Under W2 you can start adjudication at any time, but the final assessment and the tribunal notification still have their own periods. The page on time limits for NEC disputes sets them out, with both editions side by side.

Who sits behind each stage

Each stage has different people, and that shapes how you prepare. Senior Representatives are named by each Party in the Contract Data, and they work best if they weren't part of the original decision. Under NEC4, whatever is said or written at that stage can't be used before the Adjudicator or the tribunal, so people can talk openly.

The Adjudicator is appointed under an NEC contract of its own: the Dispute Resolution Service Contract in NEC4, and the Adjudicator's Contract in NEC3. See the guide to that contract. It's worth naming someone in the Contract Data, or at least a nominating body, so that a dispute doesn't begin with an argument over who decides it. The tribunal, either arbitration or the courts, is also chosen in the Contract Data before work starts.

What usually ends up in adjudication

Disputes that reach adjudication tend to fall into a few familiar groups. This isn't a complete list, but it does show where to keep the best records:

whether an event is a compensation event at all, or whether it was notified in time;
the Project Manager's assessment of a compensation event, on cost or on delay to planned Completion;
Defined Cost and Disallowed Cost on the cost-based Options;
the amount due in a payment assessment, or the final assessment;
whether a Defect exists, and who pays for correcting it;
whether a termination was valid.

In each case, the Adjudicator will look for the dated record and the clause. A clean log of notices, replies and programmes is usually worth more than a long argument written afterwards.

Termination in one page

Termination under NEC ends the Contractor's duty to carry on with the work. It doesn't end the contract's rules. The process always has the same shape:

The Party who wants to terminate notifies, giving its reason.
If the reason is one the contract allows, the Project Manager promptly certifies termination.
The Termination Table then decides the procedures (P1 to P4) and the amounts due (A1 to A4).
The Contractor stops doing further work needed to Provide the Works.
The amount due on termination is assessed and paid.

Group of reasons	Reasons	Who may use them
Insolvency-type events	R1 to R10	Either Party
Contractor's default, not put right or stopped after notification	R11 to R15	Client
Client hasn't paid	R16	Contractor
Parties released by law	R17	Either Party
Long stoppage instruction	R18, R19, R20	Client, Contractor, or either, by cause
Event stopping completion	R21	Client
Corrupt Act	R22 (NEC4)	Client

The biggest change between editions: NEC3 lets the Employer terminate for any reason. Under NEC4 the Client can only do that if Option X11 is included.

A worked example linking the two

A fictional Option A school project, under W2. All details are illustrative. The Project Manager notifies the Contractor that it has substantially failed to comply with its obligations, by repeatedly ignoring the fire stopping details in the Scope. The Contractor doesn't put the default right in the period the contract allows.

The Client notifies termination for R11, and the Project Manager issues the certificate.
The Contractor disagrees that it's in default. It keeps to the certificate's consequences, leaving the Site when instructed, and refers the dispute to adjudication within days.
Meanwhile, the Client appoints another contractor to finish, keeping careful records of the added cost for A3.
The Adjudicator decides whether the reason was valid. If not, the money position can change substantially.

Terminating on a weak reason is a large commercial and legal risk, and the adjudication that follows can come quickly, so take legal advice before serving anything and have your evidence ready first.

Keep disputes small

Adjudications are expensive and absorb management time. Under NEC, disputes are often avoidable through early warnings, replies given in time and well-kept records. See avoiding disputes on NEC contracts for a practical list, and consider using Senior Representatives voluntarily under W2, even though it isn't compulsory.

What people get wrong

Referring an out-of-time dispute under W1. The right can be lost altogether. Diarise the dates as soon as a disputed decision lands.
Treating a decision as just a recommendation. The decision binds until revised. A Party who doesn't like it still has to comply.
Forgetting the four weeks for the tribunal. Once that goes, the decision becomes final and binding.
Stopping work while a dispute runs. The Parties carry on until a decision says otherwise.
Confusing the reasons with the outcome. The chosen reason drives the procedures and the amounts due. A different reason can mean a very different bill.
Assuming NEC3 rules apply on an NEC4 job. The Client's "any reason" right and the W1 table both changed.

The guides in this section

How disputes work under NEC sets out each route and how to pick the right one.
Adjudication under NEC walks through each step, with a worked timeline.
Time limits for NEC disputes compares the periods by Option and by edition.
The tribunal explains the choice between arbitration and the courts.
Avoiding disputes gives practical habits that stop a disagreement hardening.
Termination under NEC covers the Termination Table and what the certificate does.
Reasons for termination lists R1 to R22, with periods.
Termination procedures explains P1 to P4, and when each applies.
Payment on termination sets out A1 to A4 with a worked calculation.
What changed in NEC4 termination compares the editions, change by change.
Insolvency and NEC contracts looks at the effects when a Party fails, and at the legal limits.
Ending an NEC subcontract shows how subcontract termination links to the main contract.

All guides in this section

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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.

NEC Disputes and Termination