NEC Option A: Priced contract with activity schedule
Contents |
[edit] What is NEC?
NEC was first published in 1993 as the New Engineering Contract. It is a suite of construction contracts intended to promote partnering and collaboration between the contractor and client. It is now in its fourth edition, NEC4.
The Engineering and Construction Contract (ECC) is the most frequently used, and can be adopted on projects such as infrastructure, buildings, highways and process plants. It is used for the appointment of a contractor for engineering and construction work, including any level of design responsibility.
[edit] What is option A?
Option A is a priced contract with an activity schedule, which relates to a programme where each activity is allocated a price and interim payments are made against the completion of those activities. The contractor largely bears the risk of carrying out the work at the agreed prices.
The advantage of using an activity schedule is that it simplifies the administration of the interim payment process.
[edit] How are payments calculated?
The activity schedule on these types of project is submitted together with a contract programme as part of the tender.
The activity schedule is a more important document under Option A than under Option C, as it has a significant effect on the contractor’s cash flow by directly effecting the timing and payment amount.
The sum that is due to the contractor in each assessment period is defined as the total of:
- Each group of completed activities (those without defects).
- Each completed activity not in a group.
Only when the whole of an activity is complete does the payment become due to the contractor. There is no provision for part payment.
[edit] Related articles on Designing Buildings
- Activity schedule.
- Conditions of contract.
- Construction contract.
- Contract documents.
- Contractor's working schedule.
- NEC Option B: Priced contract with bill of quantities.
- NEC Option C: Target contract with activity schedule.
- NEC Option D: Target contract with bill of quantities.
- NEC Option E: Cost reimbursable contract.
- NEC Option F: Management contract.
- NEC3.
- Right to payment.
- Term contract.
Featured articles and news
Recognising culture as key to sustainable economic growth
Creative UK Provocation paper: Culture as Growth Infrastructure.
Futurebuild and UK Construction Week London Unite
Creating the UK’s Built Environment Super Event and over 25 other key partnerships.
Welsh and Scottish 2026 elections
Manifestos for the built environment for upcoming same May day elections.
Advancing BIM education with a competency framework
“We don’t need people who can just draw in 3D. We need people who can think in data.”
Guidance notes to prepare for April ERA changes
From the Electrical Contractors' Association Employee Relations team.
Significant changes to be seen from the new ERA in 2026 and 2027, starting on 6 April 2026.
First aid in the modern workplace with St John Ambulance.
Ireland's National Residential Retrofit Plan
Staged initiatives introduced step by step.
Solar panels, pitched roofs and risk of fire spread
60% increase in solar panel fires prompts tests and installation warnings.
Modernising heat networks with Heat interface unit
Why HIUs hold the key to efficiency upgrades.
Reflecting on the work of the CIOB Academy
Looking back on 2025 and where it's going next.
Procurement in construction: Knowledge hub
Brief, overview, key articles and over 1000 more covering procurement.
Sir John Betjeman’s love of Victorian church architecture.
Exchange for Change for UK deposit return scheme
The UK Deposit Management Organisation established to deliver Deposit Return Scheme unveils trading name.
A guide to integrating heat pumps
As the Future Homes Standard approaches Future Homes Hub publishes hints and tips for Architects and Architectural Technologists.






















Comments
[edit] To make a comment about this article, or to suggest changes, click 'Add a comment' above. Separate your comments from any existing comments by inserting a horizontal line.