- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 23 Aug 2018
NEC Option B: Priced contract with bill of quantities
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.
Under Option B, the bill of quantities is a ‘traditional’ bill of quantities, i.e. a document prepared by the cost consultant (often a quantity surveyor) that provides project specific measured quantities of the items of work identified by the drawings and specifications in the tender documentation.
The contractor is entitled to interim payments, certified at assessment dates by the project manager as set out in the contract. The price for the work done to date is the quantity of completed work for each BoQ item multiplied by the relevant rate and a proportion of any lump sum item in the BoQ. The proportion of the lump sum items to be paid is determined by the extent to which they have been completed.
 Find out more
 Related articles on Designing Buildings Wiki
- Bill of quantities.
- Conditions of contract.
- Construction contract.
- Contract documents.
- Contractor's working schedule.
- NEC Option A: Priced contract with activity schedule.
- 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.
- Right to payment.
- Term contract.
Featured articles and news
Key messages from the UN COP 25 conference.
Reducing the risks of buying off-plan
A lighthouse history from Eddystone to Fastnet. Book review.
Telling the story of the Government Code and Cipher School.
Are you an experienced writer with a practical understanding of the industry?
Hagia Sophia, Istanbul.
New Dwelling House at Grange View.
The causes of sinkholes.
The growth of megacities.
The restoration of Big Ben
Improving fire-safety design with computer modelling.