Choose the NEC short form contract (the ECSC) when work is straightforward, low risk and needs little management; choose the ECC when it needs a Project Manager, a live programme or secondary Options. NEC sets no value threshold, so the job's complexity decides, not its price.
This page compares the NEC4 forms. Each has its own guide: the ECC and the ECSC. Other choices are on the NEC contract types page.
Side by side
| Topic | NEC4 ECC | NEC4 ECSC |
|---|---|---|
| Administrators | Project Manager and Supervisor | None. The Client deals directly with the Contractor |
| Pricing | Main Options A to F | Price List |
| Secondary Options | X and Y Options available | None. Construction Act terms are written into the conditions |
| Early warning | Register and regular meetings | Duty to warn and co-operate (15.1, 15.2) |
| Programme | Accepted Programme, updated and used to assess delay | Sent as the Scope says (31.1), no acceptance |
| Key Dates and sections | Yes, with Option X5 for sections | Not provided |
| Compensation events | 21, with Options adding more | 12 |
| Who may notify an event | Project Manager notifies its own, Contractor the rest | Either side (61.1) |
| Quotation | On instruction, can be revised | With the Contractor's notice, or after the Client's |
| Reply to a quotation | Accept, revise or assess | Accept, or disagree and assess |
| Delay assessed against | The Accepted Programme (63.5) | A forecast of Completion (63.6) |
Is there a threshold?
No, not in the contracts. Some organisations set an internal rule, and that can be useful as a prompt. But value alone misleads in both directions:
- A substantial, repetitive resurfacing job with clear quantities might be a perfectly good short form job.
- A small piece of work at a live railway or hospital might have enough risk and interfaces to justify the ECC.
If you do set a rule, treat it as the point where a person has to review the choice, not as an automatic answer. For example, an organisation might require sign-off from a senior commercial manager to use the ECSC above an illustrative £250,000.
A checklist to decide
Answer each question for your job. Two or more answers in the right-hand column suggest the ECC.
| Question | ECSC | ECC |
|---|---|---|
| Can the Scope be finished before tender? | Yes | No, it will develop |
| How many Others on or around the site? | Few | Many |
| Are ground or existing-condition risks real? | Low | Significant |
| Is there intermediate handover or phasing? | No | Yes |
| Do you need X7, X16, bonds or a guarantee? | No | Yes |
| Does the payment need to reflect target cost or actual cost? | No | Yes |
| Is someone able to reply fast but not in a formal PM role? | Yes | No: appoint a Project Manager |
| Will your supply chain cope with the full process? | May struggle | Yes |
What you gain and give up
The ECSC saves tender effort, is easier for small firms to read and cuts the amount of paperwork each week. In exchange, there's less structure when something goes wrong. With no Accepted Programme, arguing about delay depends on a forecast with less supporting evidence, and with no register, warnings may be lost if nobody keeps a list.
The ECC costs more to run, but if the job has the kind of trouble it was built for, that cost usually pays for itself. An administrator who keeps up with replies is worth more than a shorter contract.
The periods are different
The NEC4 ECC gives eight weeks to notify a compensation event, three to quote and two to reply. The unamended NEC4 ECSC gives four weeks to notify (61.3), one week to quote when the Client notifies (61.2) and two for the Client to reply (62.2). Under NEC3, the short form had eight weeks to notify and two to quote. Write the figures from your own form into your procedure.
A fictional example
A council has two jobs at about the same illustrative value. The first is replacing 800 metres of footway on a quiet street, with known quantities and no third parties. It uses the ECSC. The second is a small culvert repair below a live rail line, with possessions, ecology limits and an uncertain ground profile. Access dates are critical, and physical conditions are likely to be argued about. It uses the ECC, with Option A. Looking only at the price, you'd treat the jobs as the same; looking at the risk, you wouldn't.
Below either form, the choice repeats: see the back-to-back subcontracts guide.
Related guides
- NEC Contract Types: Which Form Do You Need?
- ECC vs TSC: Works or Term Service?
- ECC vs PSC: Works or Professional Services?
- Back-to-Back NEC Subcontracts
- NEC4 Framework Contract (FC)
- NEC4 Dispute Resolution Service Contract (DRSC)
See how this works in practice
Click through Contract Status with sample contracts: raise the notice, reply to it, and watch both sides of one record.
Take the guided tour Book a demo
Test your NEC knowledge, use the free NEC tools or download free NEC templates.
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.