Main contract
In a contract there is reciprocity of undertaking passing between the promisor and the promisee. The rights and obligations of the parties to the contract are created by the acts of agreement between them.
In the procurement of construction, contracts can be:
- Standard forms.
- Modified standard forms.
- Bespoke.
The ‘main contract’ is generally that which is awarded by the client (sometimes referred to as the employer) to the general contractor, or main contractor, whose tender has been accepted. The works required from the main contractor are set out in detail in tender documents, for which they have offered a price that has been accepted by the client.
Main contractors are often appointed under a traditional contract to construct a development for which the design has already been completed by consultants appointed by the client. However, under other forms of main contract, they might also provide part or all of the design, facilities management services, and even financing.
The organisations that the main contractor may appoint to carry out specific aspects of the works for them may be described as ‘subcontractors’, 'subbies', or simply as 'suppliers'. They will be appointed by the main contractor under subcontracts, and subcontractors may themselves appoint subcontractors under sub-subcontracts, and so on. See suppy chain for more information.
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Building Safety recap February, 2026
Our regular run-down of key building safety related events of the month.
Planning reform: draft NPPF and industry responses.
Last chance to comment on proposed changes to the NPPF.
A Regency palace of colour and sensation. Book review.
Delayed, derailed and devalued
How the UK’s planning crisis is undermining British manufacturing.
How much does it cost to build a house?
A brief run down of key considerations from a London based practice.
The need for a National construction careers campaign
Highlighted by CIOB to cut unemployment, reduce skills gap and deliver on housing and infrastructure ambitions.
AI-Driven automation; reducing time, enhancing compliance
Sustainability; not just compliance but rethinking design, material selection, and the supply chains to support them.
Climate Resilience and Adaptation In the Built Environment
New CIOB Technical Information Sheet by Colin Booth, Professor of Smart and Sustainable Infrastructure.
Turning Enquiries into Profitable Construction Projects
Founder of Develop Coaching and author of Building Your Future; Greg Wilkes shares his insights.
IHBC Signpost: Poetry from concrete
Scotland’s fascinating historic concrete and brutalist architecture with the Engine Shed.
Demonstrating that apprenticeships work for business, people and Scotland’s economy.
Scottish parents prioritise construction and apprenticeships
CIOB data released for Scottish Apprenticeship Week shows construction as top potential career path.
From a Green to a White Paper and the proposal of a General Safety Requirement for construction products.
Creativity, conservation and craft at Barley Studio. Book review.
The challenge as PFI agreements come to an end
How construction deals with inherited assets built under long-term contracts.
Skills plan for engineering and building services
Comprehensive industry report highlights persistent skills challenges across the sector.
Choosing the right design team for a D&B Contract
An architect explains the nature and needs of working within this common procurement route.
Statement from the Interim Chief Construction Advisor
Thouria Istephan; Architect and inquiry panel member outlines ongoing work, priorities and next steps.
























