NEC Contract data
NEC was first published in 1993 as the New Engineering Contract. It is a suite of construction contracts intended to promote partnering and collaboration. The third edition, NEC3 was published in 2005. The fourth, and currently latest edition NEC4, was published in 2018.
The contract documents under the NEC Engineering and Construction Contract (ECC) are:
- The form of agreement.
- Conditions of contract.
- Contract data.
- Prices, activities schedules and bill of quantities.
- Works information (describing what is to be done on the site).
- Site information (describing the condition of the site before the work starts).
NEC define the contract data as information that ‘…needs to be completed as part of the necessary contract documents; in the ECC this contains details such as starting date/Completion Date/employer details/defects date and the like. It is in two parts; part one (provided by the employer) and part two (provided by the contractor).’
Part one, data provided by the employer, is completed by the employer and might include data relating to:
- Details of the employer and key personnel.
- The location of the works information and site information.
- The language and law to be adopted.
- The period for reply.
- Options for adjudication / arbitration.
- Starting date / defects date / defects correction period.
- Payment details.
- Options for compensation events.
- Risk and insurance.
- Confidentiality.
- Construction operations.
- Employees.
- Intellectual property.
- Novation.
- Termination.
- Data protection.
- Force majeure.
- Early warning / compensation events.
- Disallowable expenses.
Part two, data provided by the contractor, is completed by the contractor and might include data relating to:
- Details of the contractor and key personnel.
- The location of the programme.
- The location of works information for contractor’s design.
- The location of the activity schedule.
- Direct fee percentage.
- Subcontractor fee percentage.
- Working areas (including offices).
- Details to be included in the risk register.
- The tendered price.
- Cost components.
It is very important that the contract data is completed carefully as it is this information that structures the way the contract is administered.
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Homes, landlords. tenants and the new housing standards
What will it all mean?
The Architectural Technology podcast: Where it's AT
Catch-up on the latest episodes.
Edmundson Apprentice of the Year award 2026
Entries now open for this Electrical Contractors' Association award.
Traditional blue-grey slate from one of the oldest and largest UK slate quarries down in Cornwall.
There are plenty of sources with the potential to be redeveloped.
Change of use legislation breaths new life into buildings
A run down on Class MA of the General Permitted Development Order.
Solar generation in the historic environment
Success requires understanding each site in detail.
Level 6 Design, Construction and Management BSc
CIOB launches first-ever degree programme to develop the next generation of construction leaders.
Open for business as of April, with its 2026 prospectus and new pipeline of housing schemes.
The operational value of workforce health
Keeping projects moving. Incorporating unplanned absence and the importance of health, in operations.
A carbon case for indigenous slate
UK slate can offer clear embodied carbon advantages.
Costs and insolvencies mount for SMEs, despite growth
Construction sector under insolvency and wage bill pressure in part linked to National Insurance, says report.
The place for vitrified clay pipes in modern infrastructure
Why vitrified clay pipes are reclaiming their role in built projects.
Research by construction PR consultancy LMC published.
Roles and responsibilities of domestic clients
ACA Safety in Construction guide for domestic clients.
Fire door compliance in UK commercial buildings
Architect and manufacturer gives their low down.





















