NEC Contract Types: Which Form Do You Need?

The NEC contract types are a family of forms that share one approach but differ by what you are buying: construction work, professional services, ongoing services, goods, or a combination. To pick the right one, ask what is being bought, how complex and risky it is, and whether you are the main contractor or letting work below one.

This guide covers the NEC4 suite, first published in June 2017 and since amended. NEC3 equivalents exist for many forms and are noted where they matter. For the wider background, start with the complete guide to NEC contracts. If you want a decision route rather than an overview, go straight to how to choose the right NEC contract.

The forms at a glance

You are buying	Full form	Subcontract	Short form
Construction and engineering work	ECC	ECS	ECSC (short subcontract: ECSS)
Professional services	PSC	PSS	PSSC
A service over a period, such as maintenance	TSC	TSS	TSSC
Facilities management	FMC	Facilities Management Subcontract	Facilities Management Short Contract
Goods and related services	SC	None in the suite	SSC
Design, construction and operation from one provider	DBO	Not applicable	Not applicable
A multi-party alliance on a major project or programme	ALC	Not applicable	Not applicable
A set of suppliers on call for a term	FC	Not applicable	Not applicable
An adjudicator or dispute board member	DRSC	Not applicable	Not applicable

Who does what in each form

Names change more than people expect, and using the wrong ones in letters causes confusion. The short forms have no contract administrator: the paying party gives the instructions and makes the assessments itself.

Form	Paying party	Providing party	Administrator	Main Options
ECC	Client	Contractor	Project Manager and Supervisor	A, B, C, D, E, F
ECS	Contractor	Subcontractor	Contractor	A, B, C, D, E
ECSC	Client	Contractor	None	None
ECSS	Contractor	Subcontractor	None	None
PSC	Client	Consultant	Service Manager	A, C, E
PSS	Contractor	Subcontractor	Contractor	A, C, E
PSSC	Client	Consultant	None	None
TSC	Client	Contractor	Service Manager	A, C, E
TSS	Contractor	Subcontractor	Contractor	A, C, E
TSSC	Client	Contractor	None	None
SC	Purchaser	Supplier	Supply Manager	None: one priced form
SSC	Purchaser	Supplier	None	None

The full explanation of the letters is in the guide to the NEC main Options, with separate pages on the PSC Options and the TSC Options. Remember that the Options are not the same across forms: Option E in the ECC and Option E in a service contract share an idea, not their wording.

Construction and engineering forms

Most NEC users work on one of these four.

The NEC4 Engineering and Construction Contract is the flagship form, for works of any size or complexity, with full programme, early warning and compensation event procedures.
The Engineering and Construction Subcontract sits beneath an NEC4 main contract, with the Contractor stepping into the Project Manager's position and its own set of time periods.
The Engineering and Construction Short Contract strips the process right back for straightforward, low-risk work.
The Engineering and Construction Short Subcontract applies the same simplified pattern one tier down.

Two comparison pages help at the boundary. ECC vs ECSC covers whether a job justifies the full form, and back-to-back NEC subcontracts shows how periods line up through a chain, and where they deliberately do not.

Professional service forms

These appoint designers, advisers, project managers and other consultants. The standard is skill and care rather than an outcome, and there is no Site, Equipment or Plant and Materials in the sense the works contracts use.

The NEC4 Professional Service Contract is the full form, administered by a Service Manager, with 16 core compensation events.
The Professional Service Subcontract lets a firm that holds a main appointment pass part of the service down.
The Professional Service Short Contract suits straightforward commissions with no need for a Service Manager.
Professional services under NEC explains how the Scope, rates and fee basis work across all of them.
ECC vs PSC answers a common question on design-heavy packages: is this works or a service?

Term service and facilities management forms

These cover work over a period of time, not a single project with one end date. Time is managed task by task, not against one Completion Date.

The NEC4 Term Service Contract runs over a Service Period, with work called off by Task Orders and a plan in place of a programme.
The Term Service Subcontract passes part of that service to a subcontractor.
The Term Service Short Contract handles simple services without a Service Manager.
Task Orders under NEC term service contracts covers how orders are priced, issued and changed.
The NEC4 Facilities Management Contract is a sector form for managing and providing facilities services, built on a similar pattern.
ECC vs TSC compares the two when a job could be either, such as a renewals programme.

Supply forms

The vocabulary shifts here to Purchaser, Supplier and Delivery. The NEC4 Supply Contract is for high-value goods and related services, with a Supply Manager. The Supply Short Contract is for lower-risk purchases under one order or by Batch Order, and the Purchaser administers it directly.

Integrated, multi-party and appointment forms

The NEC4 Design Build and Operate Contract appoints one contractor across an asset's design, construction and operation or maintenance. The client funds it.
The NEC4 Alliance Contract puts the Client and its partners under one contract on a major project or programme, with shared risk and reward.
The NEC4 Framework Contract sets the terms for appointing suppliers over a term, with each order placed under another NEC contract.
The NEC4 Dispute Resolution Service Contract is how an adjudicator or dispute board member is appointed. It replaced the NEC3 Adjudicator's Contract.

What stays the same, and what doesn't

The shared DNA is why moving between forms feels familiar. Across the main forms, you will find a duty of mutual trust and co-operation, early warning at clause 15, the programme or plan at clause 31, payment at clause 50, and compensation events at clause 60. Learning one form gives you a head start on the rest.

The trap is assuming the detail carries across. Some examples:

Topic	How it varies between NEC4 forms
Compensation events	21 in the ECC, 18 in the TSC and SC, 16 in the PSC, 12 in the ECSC and ECSS, 9 in the SSC and 8 in the PSSC, each with its own numbering. So 60.1(12) means physical conditions in the ECC, but something else in the others.
Early warning	A register and meetings in the full forms; a duty to warn and co-operate, with no register or formal meetings, in the short forms.
Programme	Accepted Programme in the ECC, PSC and SC; a plan plus Task Order programmes in the TSC; programmes supplied as the Scope says in the short forms.
Time bar for notifying a compensation event	Eight weeks in the ECC, seven in the ECS and PSS. Read the figure in the form you are actually using.
Construction Act wording	Option Y(UK)2 in the ECC, PSC and TSC; numbered conditions in short forms such as the PSSC; not an Option in the SC at all.

Copying a clause reference from one form into a letter under another is an easy way to send an invalid-looking notice. Keep the right form open when you write.

Mistakes people make when choosing

Choosing by contract value alone. Nothing in the short forms sets a financial limit. The test is whether the work is straightforward and low risk, and a small job with difficult ground or several interfaces may still need the ECC.
Using a works contract for a service, or the reverse. A five-year maintenance arrangement forced onto the ECC leaves you without Task Orders. A design commission on the ECC brings in a level of liability the designer may not have intended.
Mixing subcontract forms casually. The ECS is designed for use under an NEC4 main contract. Before using it elsewhere, look at what depends on the main contract, such as the joining of adjudications and termination links.
Treating a framework as a contract for the work. The framework sets how orders are placed. The obligations to deliver and pay sit in each order's own contract.
Not budgeting for administration. Full forms assume someone is available to reply on time. If nobody will do that, choosing the ECC does not produce the benefits, and late replies themselves become compensation events.

Editions

A contract keeps the edition it was signed under, so plenty of NEC3 work is still running. Names and numbers changed between the editions: the Employer became the Client and Works Information became the Scope. The differences are in NEC3 vs NEC4. Also confirm which amendments your copy includes, since NEC has reissued the NEC4 forms with changes since 2017.

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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.