JCT Sub-subcontract
The Joint Contracts Tribunal (JCT) was formed by the Royal Institute of British Architects (RIBA) in 1931 when the first JCT standard form of building contract was issued. It now produces a range of standard forms of contract for the construction of buildings accompanied by guidance notes and other standard forms of documentation.
As buildings have become increasingly complicated, so it is less and less likely that any one contractor will have the required skills to carry out all of the works necessary to construct them. As a result, a supply chain is likely to be created, consisting of an interconnected hierarchy of supply contracts that together will carry out the works.
A subcontract is an agreement between the main contractor and an organisation or individual to perform a portion of the works for which the main contractor was contracted.
A sub-subcontract is an agreement between a subcontractor and an organisation or individual to perform a portion of the works for which the subcontractor was contracted.
The JCT Sub-subcontract (SubSub) is designed for use on sub-subcontract works where the main contract is a JCT contract and sub-contracts are one or more of the JCT sub-contracts.
It can be used on a standard sub-contract, and also where the works (sub-subcontract or sub-contract) are intended to be carried out in sections. The works can be based on remeasurement or on an adjusted sub-subcontract sum. It is not suitable where the works are of a complex technical nature, or if they require full back-to-back provisions with the sub-contract.
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
A case study and a warning to would-be developers
Creating four dwellings... after half a century of doing this job, why, oh why, is it so difficult?
Reform of the fire engineering profession
Fire Engineers Advisory Panel: Authoritative Statement, reactions and next steps.
Restoration and renewal of the Palace of Westminster
A complex project of cultural significance from full decant to EMI, opportunities and a potential a way forward.
Apprenticeships and the responsibility we share
Perspectives from the CIOB President as National Apprentice Week comes to a close.
The first line of defence against rain, wind and snow.
Building Safety recap January, 2026
What we missed at the end of last year, and at the start of this...
National Apprenticeship Week 2026, 9-15 Feb
Shining a light on the positive impacts for businesses, their apprentices and the wider economy alike.
Applications and benefits of acoustic flooring
From commercial to retail.
From solid to sprung and ribbed to raised.
Strengthening industry collaboration in Hong Kong
Hong Kong Institute of Construction and The Chartered Institute of Building sign Memorandum of Understanding.
A detailed description from the experts at Cornish Lime.
IHBC planning for growth with corporate plan development
Grow with the Institute by volunteering and CP25 consultation.
Connecting ambition and action for designers and specifiers.
Electrical skills gap deepens as apprenticeship starts fall despite surging demand says ECA.
Built environment bodies deepen joint action on EDI
B.E.Inclusive initiative agree next phase of joint equity, diversity and inclusion (EDI) action plan.
Recognising culture as key to sustainable economic growth
Creative UK Provocation paper: Culture as Growth Infrastructure.





















