Traditional contract for construction
The client first appoints consultants to design the project in detail, and then prepare tender documentation, including drawings, work schedules and bills of quantities. Contractors are then invited to submit tenders for the construction of the project, usually on a single-stage, competitive basis. This may be referred to as a 'traditional contract'. The contractor is not responsible for the design, other than temporary works, although some traditional contracts do provide for the contractor to design specific parts of the works.
Typically, the client retains the design consultants during the construction phase to prepare any additional design information that may be required, to review any designs that might be prepared by the contractor, and to inspect the works. Normally, one consultant (often, but not necessarily, the architect) will be appointed to administer the contract.
Traditional construction contracts are most commonly lump-sum contracts, however, measurement contracts and cost reimbursement contracts can also be used for ‘traditional’ projects where design and construction are separate, sequential activities.
This form of procurement is suitable for both experienced and inexperienced clients. Fully developing the design before tender gives the client certainty about design quality and cost, but it can be slower than other forms of contracting, and as the contractor is appointed only once the design is complete, they are not able to help improve the buildability and packaging of proposals as they develop.
It is considered to be a low risk method of contracting for the client, as the contractor takes the financial risk for construction. However, if design information is incomplete at tender, or if significant variations are required after the contractor has been appointed, the cost to the client can be significant. Because of this, and because of the separation of design and construction, traditional procurement can be seen as adversarial.
 Related articles on Designing Buildings Wiki
- Atkins v Secretary of State for Transport.
- Appointing consultants.
- Bill of quantities.
- Construction contract.
- Contract conditions.
- Design quality.
- Procurement route.
- Temporary works.
- Tender documentation.
- Traditional contract: outline work plan.
- Two-stage tender.
 External references
- JCT (Joint Contracts Tribunal)
Featured articles and news
Sadiq Khan publishes a new development strategy for the capital.
In the week of the momentous Heathrow decision, we look back at the development and design of T5.
BSRIA’s flagship event will address performance and wellbeing beyond compliance.
Young Architects and Developers Alliance launched to build the relationship between the two disciplines.
BS 8536-2:2016 Design and construction: Code of practice for asset management (Linear and geographical infrastructure).
Paying for off-site goods or materials can be useful, but it puts the client at risk.
People power can be transformative if properly informed and inspired.
ZHA win competition to build an Urban Heritage Administration Centre in Saudi Arabia.
Leaps, not steps, are needed to avoid a ticking time bomb, say BRE in response to Farmer Review.
A multi-purpose hall in France covered in a translucent orange membrane.
Winning designs revealed for a rock formation-influenced residential complex in Rennes.
An article explaining the techniques, regulations and environmental impacts of carbon capture and storage.
Watch one of the first documentaries by the acclaimed Adam Curtis, examining the substandard system building of the 1960s.